强制进行IDataErrorInfo验证 [英] Force IDataErrorInfo validation

问题描述

我在某些面板上有两个控件:文本框和组合框:

I have two controls on some panel: textbox and combobox:

<TextBox Text="{Binding ShapeName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />

<ComboBox SelectedItem="{Binding ActiveStageViewModel, Mode=OneWayToSource, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />

当我在组合框上选择某些内容时，我需要强制对文本框进行idataerrorinfo验证.该怎么做?

I need to force idataerrorinfo validation for textbox, when I select something on combobox. How to do that?

viewmodel中的代码:

The code from viewmodel:

string IDataErrorInfo.this[string propertyName]
    {
      get
      {
        var error = string.Empty;

        if (propertyName == Expression.GetPropertyName(() => ActiveStageViewModel))
        {
          // TODO: Add functionality to force ShapeName property validation
          return error;
        }

        if (propertyName == Expression.GetPropertyName(() => ShapeName))
        {
          error = ValidateShapeName();
        }

        TooltipMessage = error;
        return error;
      }
    }

推荐答案

只需为要验证的属性引发NotifyPropertyChanged事件，或者如果您使用的是.NET 4.5或Silverlight 4，请使用

Just raise the NotifyPropertyChanged event for the property you want to validate or if you are in .NET 4.5 or Silverlight 4 use the INotityDataErrorInfo.

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