带有附加事件的 EventToCommand

我在附加事件上使用Validation.Error的文本框。

验证错误 http://msdn.microsoft.com/en-us/library/system.windows.controls.validation.error%28v=vs.100%29.aspx

我想将它绑定到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来做到这一点，你可以在下面的链接中看到它：

将 mvvm 事件附加到附加事件的命令 http://sergecalderara.wordpress.com/2012/08/23/how-to-attached-an-mvvm-eventtocommand-to-an-attached-event/

但我收到一个错误：

RoutedEventConverter cannot convert from System.String.

有人可以帮忙吗？

EDIT :

我的命令在ViewModel

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

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

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

根据您发布的链接，

班上RoutedEventTrigger期望一个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>

to

<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