事件命令中的Validation.error事件 [英] Validation.error event in event command

问题描述

我有一个文本框:

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

我的ViewModel看起来像这样:

My ViewModel looks like this:

  public class MyViewModel : ValidationViewModelBase, INotifyPropertyChanged
{
    private int myVar;

    [Range(0, 10)]
    public int MyProperty
    {
        get { return myVar; }
        set
        {
            myVar = value;
            OnPropertyChanged("MyProperty");
        }
    }



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

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

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

    #region INotifyPropertyChanged

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(string name)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(name));
        }
    }

    #endregion INotifyPropertyChanged
}

当我在背后的代码中捕获事件Validation.Error时，它起作用:

When I catch the event Validation.Error in Code Behind it works:

但是，当我尝试通过Event Command来运行这种方式时，Valid函数无效.

But when I try to run it this way with the Event Command is not coming Valid function.

我错过了什么吗?

推荐答案

由于Validation.Error是附加事件，因此它通常不适用于EventToCommand.

Since Validation.Error is Attached Event, then it does not work with EventToCommand normally.

您将在以下链接中找到答案:

The answer you will find at the link below:

附有事件的EventToCommand

EventToCommand with attached event

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