c# - 为什么我的WPF PasswordBox样式触发器不起作用？-6ren

c# - 为什么我的WPF PasswordBox样式触发器不起作用？

转载作者：太空狗更新时间：2023-10-29 21:48:50

所以我的应用程序中有这个 PasswordBox 。

XAML

<PasswordBox Name="PB_PASSWORD" Padding="100,0,34,0" FontSize="20" Width="384" Height="34" PasswordChar="█" Password="" HorizontalAlignment="Left" VerticalAlignment="Top" FontFamily="Century Gothic" HorizontalContentAlignment="Left" VerticalContentAlignment="Center" TabIndex="2" PasswordChanged="PB_PASSWORD_PasswordChanged" >
            <PasswordBox.Style>
                <Style BasedOn="{x:Null}" TargetType="{x:Type PasswordBox}">
                    <Setter Property="Background" Value="#FFCCCCCC" />
                    <Setter Property="Foreground" Value="#FFF22613" />
                    <Setter Property="BorderBrush" Value="#FFF22613" />
                    <Setter Property="BorderThickness" Value="0,2,0,2" />
                    <Setter Property="ClipToBounds" Value="true"/>
                    <Setter Property="OverridesDefaultStyle" Value="true"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="PasswordBox">
                                <Grid>
                                    <Border Background="{TemplateBinding Background}"
                                            BorderBrush="{TemplateBinding BorderBrush}"
                                            BorderThickness="{TemplateBinding BorderThickness}">
                                        <ScrollViewer x:Name="PART_ContentHost" Margin="0,-4,0,0" />
                                    </Border>
                                    <TextBlock Name="TB" Text="Password" HorizontalAlignment="Left" Margin="140,0,0,0" VerticalAlignment="Center" Foreground="#FF222222" Opacity="0.3"/>
                                </Grid>
                                <ControlTemplate.Triggers>

                                    <Trigger Property="IsFocused" Value="true">
                                        <Setter TargetName="TB" Property="Text" Value="Password:" />
                                        <Trigger.EnterActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="100,0,34,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="2,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </Trigger.EnterActions>
                                        <Trigger.ExitActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="230,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="140,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="0.3" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </Trigger.ExitActions>
                                    </Trigger>

                                    <Trigger Property="ClipToBounds" Value="false">
                                        <Setter TargetName="TB" Property="Text" Value="Password:" />
                                        <Trigger.EnterActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="100,0,34,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="2,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </Trigger.EnterActions>
                                        <Trigger.ExitActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="230,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="140,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="0.3" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </Trigger.ExitActions>
                                    </Trigger>

                                    <MultiTrigger>
                                        <MultiTrigger.Conditions>
                                            <Condition Property="IsFocused" Value="false" />
                                            <Condition Property="ClipToBounds" Value="true" />
                                        </MultiTrigger.Conditions>
                                        <Setter TargetName="TB" Property="Text" Value="Password" />
                                        <MultiTrigger.EnterActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="230,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="140,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="0.3" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </MultiTrigger.EnterActions>
                                        <MultiTrigger.ExitActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="100,0,34,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="2,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </MultiTrigger.ExitActions>
                                    </MultiTrigger>

                                    <Trigger Property="IsEnabled" Value="false">
                                        <Setter TargetName="TB" Property="Text" Value="DISABLE"/>
                                        <Setter TargetName="TB" Property="Margin" Value="140,0,0,0"/>
                                        <Setter Property="Background" Value="#FFAAAAAA"/>
                                        <Setter Property="Foreground" Value="#FF777777"/>
                                        <Setter Property="BorderBrush" Value="#FF888888" />
                                        <Setter Property="BorderThickness" Value="0,3,0,3" />
                                    </Trigger>

                                    <Trigger Property="Tag" Value="ShowPW">
                                        <Setter Property="Visibility" Value="Hidden"/>
                                    </Trigger>

                                    <Trigger Property="Tag" Value="HidePW">
                                        <Setter Property="Visibility" Value="Visible"/>
                                    </Trigger>

                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                    </Style.Triggers>
                </Style>
            </PasswordBox.Style>
        </PasswordBox>

输入的密码为空时，我需要更改其边框颜色。

如果PasswordBox的密码值已更改，则以下代码将更改BorderColor。
注意:清除PasswordBox.Password后，将发生PasswordBox禁用。所以这不重要[我猜]。
C#

    private void PB_PASSWORD_PasswordChanged(object sender, RoutedEventArgs e)
    {
        if (PB_PASSWORD.SecurePassword.Length == 0)
        {   //Password is Empty.
            PB_PASSWORD.ClipToBounds = true;
        }
        else
        {   //Password Not Empty
            PB_PASSWORD.ClipToBounds = false;
        }

        Int32 PWStrength = 0;
        if (PB_PASSWORD.SecurePassword.Length >= 5)
        {
            //A Function that Return int Value between 0-5 depending on how Strong is Password.
            PWStrength = GetPasswordStrength(Marshal.PtrToStringUni(Marshal.SecureStringToGlobalAllocUnicode(PB_PASSWORD.SecurePassword)));
        }
            //Corresponding Colors Are Set as per Returned Integer0=red, 1=Orange+Red, 2=Orange, 3=Yellow, 4=Light Green, 5=Green
        switch (PWStrength)
        {
            case 0:
                {
                    //Following 2 Lines Required to Unfreez Color From Control
                    PB_PASSWORD.Foreground = new SolidColorBrush(CustomColors.PasswordStrengthColors[PWStrength]);
                    PB_PASSWORD.BorderBrush = new SolidColorBrush(CustomColors.PasswordStrengthColors[PWStrength]);

                    ColorAnimation AnimateForegroundColor_0 = new ColorAnimation(CustomColors.PasswordStrengthColors[PWStrength], new Duration(TimeSpan.FromMilliseconds(200)));
                    PB_PASSWORD.Foreground.BeginAnimation(SolidColorBrush.ColorProperty, AnimateForegroundColor_0);
                    ColorAnimation AnimateBorderBrushColor_0 = new ColorAnimation(CustomColors.PasswordStrengthColors[PWStrength], new Duration(TimeSpan.FromMilliseconds(200)));
                    PB_PASSWORD.BorderBrush.BeginAnimation(SolidColorBrush.ColorProperty, AnimateBorderBrushColor_0);
                    break;
                }

            default:
                {
                    ColorAnimation AnimateForegroundColor = new ColorAnimation(CustomColors.PasswordStrengthColors[PWStrength], new Duration(TimeSpan.FromMilliseconds(200)));
                    PB_PASSWORD.Foreground.BeginAnimation(SolidColorBrush.ColorProperty, AnimateForegroundColor);
                    ColorAnimation AnimateBorderBrushColor = new ColorAnimation(CustomColors.PasswordStrengthColors[PWStrength], new Duration(TimeSpan.FromMilliseconds(200)));
                    PB_PASSWORD.BorderBrush.BeginAnimation(SolidColorBrush.ColorProperty, AnimateBorderBrushColor);
                    break;
                }
        }
    }

密码值不可访问，因此我使用 ClipToBounds bool 值进行设置，如下所示:
C#

if (String.IsNullOrEmpty(PB_PASSWORD.Password))
{ PB_PASSWORD.ClipToBounds = true; }
else
{ PB_PASSWORD.ClipToBounds = false; }

首次启动应用程序时，此功能运行良好。

当我从后面的代码中修改启用/禁用值时，问题就开始了，如下所示:

C#

    private void Button_Click(object sender, RoutedEventArgs e)
    {

        if (PB_PASSWORD.IsEnabled)
        {
            PB_PASSWORD.ClipToBounds = true;
            PB_PASSWORD.Password = "";
            BTN_BROWSE.Focus();
            PB_PASSWORD.MoveFocus(new System.Windows.Input.TraversalRequest(System.Windows.Input.FocusNavigationDirection.Next));
            PB_PASSWORD.IsEnabled = false;
        }
        else
        {
            PB_PASSWORD.IsEnabled = true;
        }
    }

输入密码然后禁用后，应该看起来像这样:

但它看起来像这样:

我需要在XAML代码中解决它。

最佳答案

链接到项目:HERE-必须下载!

我决定为您提供完整的MVVM示例，以便您可以学习“正确方法”。

Note: I am using MVVM Light (for it's RelayCommand). You can install it through NuGet. It's worth having, as it provides a lot of useful classes for MVVM development. Another alternative to it is Prism.

1.什么是MVVM？

MVVM(模型- View - View 模型)是一种编程模式，与WPF完美结合。它的主要目的是将 View (您所看到的)与 ViewModels (您的程序的逻辑)分离。

它可能会导致需要更多的编码，但是 yield 却是巨大的-您将获得干净，结构化的代码，该代码是模块化的并且非常容易测试(即单元测试)。

1.1-模型

模型基本上是程序的结构。它应该为您的类提供主干，这些主干保存数据并在ViewModels中进一步使用。

在此项目中-尽管没有模型-不需要模型(随着您的应用程序的发展，肯定会需要它!)

1.2-查看

View 基本上就是您所看到的。大多数情况下，它是一个窗口，它具有显示的元素-但并不仅限于此!一个UserControl本身可以是一个View，并具有自己的ViewModel绑定(bind)-与它所在的Window不同。

1.3 ViewModel

ViewModel基本上是程序的核心。它拥有逻辑并具有View可以绑定(bind)到并在其控件中使用/显示的属性。
将其视为您的应用程序的 brain。

2.代码

查看:

<Window x:Class="PasswordBoxMVVM.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:PasswordBoxMVVM"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
    xmlns:b="clr-namespace:System.Media;assembly=System"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <local:PasswordLengthToColorConverter x:Key="passwordLengthToColorConverter" />
</Window.Resources>
<Grid>
    <StackPanel VerticalAlignment="Center">
        <PasswordBox local:PasswordBoxMVVMAttachedProperties.EncryptedPassword="{Binding Path=Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                     IsEnabled="{Binding Path=IsPasswordFieldDisabled, Mode=TwoWay ,UpdateSourceTrigger=PropertyChanged}"
                     FontSize="20" Width="384" Height="34" PasswordChar="█" HorizontalAlignment="Center" FontFamily="Century Gothic" 
                     HorizontalContentAlignment="Left" VerticalContentAlignment="Center" TabIndex="2" Foreground="Red"
                     PasswordChanged="MyPasswordBox_PasswordChanged"
                     IsEnabledChanged="PasswordBox_IsEnabledChanged">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="PasswordChanged">
                    <i:InvokeCommandAction Command="{Binding Path=PasswordChangedCommand}" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
            <PasswordBox.Style>
                <Style TargetType="{x:Type PasswordBox}">
                    <Setter Property="Background" Value="#FFCCCCCC" />
                    <Setter Property="BorderThickness" Value="0,2,0,2" />
                    <Setter Property="BorderBrush" Value="Red" />
                    <Setter Property="ClipToBounds" Value="true"/>
                    <Setter Property="OverridesDefaultStyle" Value="true"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="PasswordBox">
                                <Grid>
                                    <Border Background="{TemplateBinding Background}"
                                            BorderThickness="{TemplateBinding BorderThickness}"
                                            BorderBrush="{TemplateBinding Foreground}">
                                        <ScrollViewer x:Name="PART_ContentHost" Margin="0,-4,0,0"/>
                                    </Border>
                                    <TextBlock Name="TB" Text="Password" HorizontalAlignment="Left" Margin="140,0,0,0" VerticalAlignment="Center"  Opacity="0.3" Foreground="Gray">
                                    </TextBlock>
                                </Grid>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsFocused" Value="true">
                                        <Setter TargetName="TB" Property="Text" Value="Password:" />
                                        <Trigger.EnterActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="100,0,34,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="2,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </Trigger.EnterActions>
                                        <Trigger.ExitActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="230,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="140,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="0.3" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </Trigger.ExitActions>
                                    </Trigger>

                                    <DataTrigger Binding="{Binding Path=IsPasswordFieldEmpty,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="false">
                                        <Setter TargetName="TB" Property="Text" Value="Password:" />
                                        <DataTrigger.EnterActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="100,0,34,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="2,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </DataTrigger.EnterActions>
                                        <DataTrigger.ExitActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="230,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="140,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="0.3" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </DataTrigger.ExitActions>
                                    </DataTrigger>

                                    <MultiDataTrigger>
                                        <MultiDataTrigger.Conditions>
                                            <Condition Binding="{Binding Path=IsFocused, RelativeSource={RelativeSource Self}}" Value="false" />
                                            <Condition Binding="{Binding Path=IsPasswordFieldEmpty, UpdateSourceTrigger=PropertyChanged}" Value="true" />
                                        </MultiDataTrigger.Conditions>
                                        <Setter TargetName="TB" Property="Text" Value="Password" />
                                        <MultiDataTrigger.EnterActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="230,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="140,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="0.3" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <BackEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </MultiDataTrigger.EnterActions>
                                        <MultiDataTrigger.ExitActions>
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ThicknessAnimation Storyboard.TargetProperty="Padding" To="100,0,34,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <ThicknessAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Margin" To="2,0,0,0" Duration="0:0:0.3">
                                                        <ThicknessAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </ThicknessAnimation.EasingFunction>
                                                    </ThicknessAnimation>
                                                    <DoubleAnimation Storyboard.TargetName="TB" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.3">
                                                        <DoubleAnimation.EasingFunction>
                                                            <SineEase EasingMode="EaseOut"/>
                                                        </DoubleAnimation.EasingFunction>
                                                    </DoubleAnimation>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </MultiDataTrigger.ExitActions>
                                    </MultiDataTrigger>

                                    <Trigger Property="IsEnabled" Value="false">
                                        <Setter TargetName="TB" Property="Text" Value="DISABLE"/>
                                        <Setter TargetName="TB" Property="Margin" Value="140,0,0,0"/>
                                        <Setter Property="Background" Value="#FFAAAAAA"/>
                                        <Setter Property="Foreground" Value="Gray"/>
                                        <Setter Property="BorderBrush" Value="#FF888888" />
                                        <Setter Property="BorderThickness" Value="0,3,0,3" />
                                    </Trigger>
                                    <Trigger Property="Tag" Value="ShowPW">
                                        <Setter Property="Visibility" Value="Hidden"/>
                                    </Trigger>
                                    <Trigger Property="Tag" Value="HidePW">
                                        <Setter Property="Visibility" Value="Visible"/>
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                    </Style.Triggers>
                </Style>
            </PasswordBox.Style>
            <PasswordBox.Triggers>
                <EventTrigger RoutedEvent="PasswordBox.PasswordChanged">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="(PasswordBox.Foreground).(SolidColorBrush.Color)" 
                                            To="{Binding Path=Password.Length, UpdateSourceTrigger=PropertyChanged, 
                                            Converter={StaticResource passwordLengthToColorConverter}}" Duration="0:0:0.1">
                            </ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
                <EventTrigger RoutedEvent="local:PasswordBoxAttachedEvent.HasBeenDisabled">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="(PasswordBox.Foreground).(SolidColorBrush.Color)" 
                                            To="Gray" Duration="0:0:0.1">
                            </ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
                <EventTrigger RoutedEvent="local:PasswordBoxAttachedEvent.HasBeenEnabled">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="(PasswordBox.Foreground).(SolidColorBrush.Color)" 
                                            To="{Binding Path=Password.Length, UpdateSourceTrigger=PropertyChanged, 
                                            Converter={StaticResource passwordLengthToColorConverter}}" Duration="0:0:0.1">
                            </ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </PasswordBox.Triggers>
        </PasswordBox>
        <Button Width="200" Height="50" Margin="0,50,0,0" Command="{Binding Path=ClickCommand}">Click me</Button>
    </StackPanel>
</Grid>

这与您提供的内容没有太大不同，但是已被扭曲到MVVM中-添加了绑定(bind)，命令和转换器。他们需要绑定(bind)(连接)我们的 View 和 ViewModel 。

View 的背后代码:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        var vm = new PasswordViewModel();
        this.DataContext = vm;

        InitializeComponent();
    }

    private void MyPasswordBox_PasswordChanged(object sender, RoutedEventArgs e)
    {
        PasswordBox pBox = sender as PasswordBox;
        PasswordBoxMVVMAttachedProperties.SetEncryptedPassword(pBox, pBox.SecurePassword);    
    }

    private void PasswordBox_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        PasswordBox pBox = sender as PasswordBox;

        if (pBox.IsEnabled == false)
        {
            RoutedEventArgs eventArgs = new RoutedEventArgs(PasswordBoxAttachedEvent.HasBeenDisabledEvent);
            pBox.RaiseEvent(eventArgs);
        }
        if (pBox.IsEnabled == true)
        {
            RoutedEventArgs eventArgs = new RoutedEventArgs(PasswordBoxAttachedEvent.HasBeenEnabledEvent);
            pBox.RaiseEvent(eventArgs);
        }
    }
}

在View的构造函数中，我们定义ViewModel-并将其设置为View的 DataContext。

下面是一些事件处理程序，使我们可以附加事件和属性-但稍后我们将对此进行讨论。

重要提示:在继续自己学习MVVM时，您可能会看到人们说“在良好的MVVM中，View中不应包含任何代码”。那实际上是完整的公牛** :)
只要不违反任何MVVM原理，将代码放在View中绝对好-通常，它常常使某些事情的编写变得容易一些。

ViewModel:

namespace PasswordBoxMVVM
{
    public class PasswordViewModel : ViewModelBase
    {
        private bool isPasswordFieldEmpty;
        public bool IsPasswordFieldEmpty
        {
            get { return isPasswordFieldEmpty; }
            set
            {
                isPasswordFieldEmpty = value;
                RaisePropertyChanged();
            }
        }

        private SecureString password;
        public SecureString Password
        {
            get { return password; }
            set
            {
                password = value;
                RaisePropertyChanged();
            }
        }

        private bool isPassWordFieldDisabled;
        public bool IsPasswordFieldDisabled
        {
            get { return isPassWordFieldDisabled; }
            set
            {
                isPassWordFieldDisabled = value;
                RaisePropertyChanged();
            }
        }

        public ICommand ClickCommand { get { return new RelayCommand(doAction, canDoAction); } }
        public ICommand PasswordChangedCommand { get { return new RelayCommand(updatePassword, canUpdatePassword); } }

        public PasswordViewModel()
        {
            // Init conditions, need them to not get null reference at the start.
            isPassWordFieldDisabled = true;
            IsPasswordFieldEmpty = true;
        }

        private void doAction()
        {
            IsPasswordFieldDisabled = !IsPasswordFieldDisabled;
        }

        private bool canDoAction()
        {
            // Replace this with any condition that you need.
            return true;
        }

        private void updatePassword()
        {
            if (Password != null)
            {
                if (Password.Length > 0)
                {
                    isPasswordFieldEmpty = false;
                }
                else
                {
                    isPasswordFieldEmpty = true;
                }
            }
            else
            {
                isPasswordFieldEmpty = true;
            }
        }

        private bool canUpdatePassword()
        {
            // Replace this with any condition that you need. 
            return true;
        }
    }
}

这里发生了很多事情。首先，我们有一些公共(public)属性，例如Password，isPasswordFieldDisabled等。这些是我们的View可以绑定(bind)到的属性，它使我们可以从ViewModel中控制View。

我们也有命令，这是View与我们的ViewModel进行交互的一种方式。 View 将某些东西绑定(bind)到这些命令(例如事件)，然后我们基于ViewModel中的代码执行代码。

在此示例中，单击按钮将向我们的ViewModel发射命令，这将更改isPasswordBoxDisabled属性，我们的PasswordBox isEnabled属性绑定(bind)到-实际上，启用/禁用PasswordBox，而View和ViewModel之间没有任何直接交互!酷吧？

转换器

namespace PasswordBoxMVVM
{
    class PasswordLengthToColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            int length = (int)value;
            Color output = Colors.Red;

            if (length >= 0 && length < 5)
                output = Colors.Red;

            else if (length >= 5 && length < 6)
                output = Colors.Orange;

            else if (length >= 6 && length < 7)
                output = Colors.Yellow;

            else if (length >= 7 && length < 8)
                output = Colors.LightGreen;

            else if (length >= 8)
                output = Colors.Green;

            return output;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }
}

转换器很像翻译器。在这里，我们将密码长度转换为颜色-以便以后可以在动画中使用它们。
当我说MVVM是模块化的时，这就是我的意思的完美示例-您想要不同的转换吗？只需拍一个绑定(bind)到新转换器，就可以完成，无需重写您的View!

密码附加属性-外观链接的项目

这仅仅是出于我们需要将PasswordBox的密码绑定(bind)到ViewModel的需要。最初，PasswordBox不支持该功能。输入附加属性!它通过附加一个新属性(因此命名)，从而“扩展”了我们的PasswordBox的可能性-一个我们可以绑定(bind)到ViewModel的属性。

附加事件也是如此-您可以在代码中找到其他所有内容，因为字符配额限制了我无法粘贴更多内容。

关于c# - 为什么我的WPF PasswordBox样式触发器不起作用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43782774/

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c# - 为什么我的WPF PasswordBox样式触发器不起作用？