c# - WPF ListView : Detect when listviewitem is selected and then check it

Question

我有以下 ListView :

<ListView Margin="10" Name="lvUsers" AlternationCount="2" SelectionMode="Extended">

<ListView.View>
    <GridView>
        <!-- Checkbox header -->
            <GridViewColumn>

                <GridViewColumn.Header>
                    <CheckBox Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked"/>
                </GridViewColumn.Header>

                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <CheckBox IsChecked="{Binding IsChecked}" />
                        </StackPanel>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>

            <GridViewColumn Header="Name" Width="120" DisplayMemberBinding="{Binding Name}" />
        <GridViewColumn Header="Age" Width="50" DisplayMemberBinding="{Binding Age}" />
        <GridViewColumn Header="Mail" Width="150" DisplayMemberBinding="{Binding Mail}" />
    </GridView>
</ListView.View>

    <!-- SELECTED ITEM EVENT -->
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="ListViewItem_MouseLeftButtonDown" />
        </Style>
    </ListView.ItemContainerStyle>

</ListView>

和事件的代码隐藏:

    private void ListViewItem_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        var item = sender as ListViewItem;
        if (item != null && item.IsSelected)
        {
            //Do your stuff
        }

    }

这是数据模型:

public class User : INotifyPropertyChanged
{
    private bool isChecked = false;
    private string name = string.Empty;
    private int age = 0;
    private string mail = string.Empty;

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(String propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public bool IsChecked {
        get
        {
            return this.isChecked;
        }

        set
        {
            if (value != this.isChecked)
            {
                this.isChecked = value;
                NotifyPropertyChanged("IsSelected");
            }
        }
    }

    public string Name
    {
        get
        {
            return this.name;
        }

        set
        {
            if (value != this.name)
            {
                this.name = value;
                NotifyPropertyChanged("Name");
            }
        }
    }

    public int Age {
        get
        {
            return this.age;
        }

        set
        {
            if (value != this.age)
            {
                this.age = value;
                NotifyPropertyChanged("Age");
            }
        }
    }

    public string Mail {
        get
        {
            return this.mail;
        }

        set
        {
            if (value != this.mail)
            {
                this.mail = value;
                NotifyPropertyChanged("Mail");
            }
        }
    }
}

我在 ListView 标题处有一个复选框，每个 ListView 项目都有一个复选框。

我正在尝试检测何时选择了 listviewitem，然后一旦选择，我想将其标记为已选中。 Listviewitem 事件 PreviewMouseLeftButtonDown 不起作用，当触发 item.IsSelected 时为 false，因为它是在按下鼠标左键之前的预览。没有 MouseClick 事件，只有 MouseDoubleClick。

此外，单击 listviewitem 后，我想将选中的项目标记为已选中(已选中复选框)。

我该怎么做？

Answer 1

在 ListViewItem 样式中绑定(bind) IsSelected 属性:

<ListView.ItemContainerStyle>
    <Style TargetType="ListViewItem">
        <Setter Property="IsSelected" Value="{Binding IsChecked}"/>
    </Style>
</ListView.ItemContainerStyle>

---

请注意，为避免属性名称出现打印错误，您可以使用 CallerMemberName 属性，这会使编译器生成正确的属性名称:

using System.Runtime.CompilerServices;
...

private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

public bool IsChecked
{
    get { return isChecked; }
    set
    {
        isChecked = value;
        NotifyPropertyChanged();
    }
}