wpf - 带有附加事件的 EventToCommand

Question

我在附加事件中使用 Validation.Error的文本框。

Validation.Error

我想绑定(bind)到EventToCommand .

通常它不起作用:

 <TextBox Height="20" Width="150" Text="{Binding MyProperty,NotifyOnValidationError=True,ValidatesOnDataErrors=True}" ><!--Validation.Error="TextBox_Error"-->
     <i:Interaction.Triggers>
        <i:EventTrigger EventName="Validation.Error">
           <mvvm:EventToCommand Command="{Binding MyCmd}" PassEventArgsToCommand="True" ></mvvm:EventToCommand>
        </i:EventTrigger>
     </i:Interaction.Triggers>
  </TextBox>

所以我找到了一种方法，你可以在下面的链接中看到它:

Attached an mvvm event to command to an attached event

但我收到一个错误:

RoutedEventConverter cannot convert from System.String.

任何人都可以帮忙吗？

编辑:

我在 ViewModel 中的命令

  public MyViewModel()
    {
        MyCmd = new RelayCommand<RoutedEventArgs>(Valid);
    }

    public RelayCommand<RoutedEventArgs> MyCmd { get; set; }

    private void Valid(RoutedEventArgs args)
    {
        //Do something
    }

Answer 1

根据您发布的链接，

类(class)RoutedEventTrigger预计 RoutedEvent并且您的 xaml 无法转换字符串 Validation.Error到所需的类型。

所以切换

<i:Interaction.Triggers>
  <view_model:RoutedEventTrigger RoutedEvent="Validation.Error">
    <mvvm:EventToCommand Command="{Binding MyCmd}" PassEventArgsToCommand="True" />
  </view_model:RoutedEventTrigger>
</i:Interaction.Triggers>

到

<i:Interaction.Triggers>
  <view_model:RoutedEventTrigger RoutedEvent="{x:Static Validation.ErrorEvent}">
    <mvvm:EventToCommand Command="{Binding MyCmd}" PassEventArgsToCommand="True" />
  </view_model:RoutedEventTrigger>
</i:Interaction.Triggers>

应该没问题