自定义验证

Question

所以我想沿着这个例子做一些事情：http://www.codeproject.com/KB/WPF/wpfvalidation.aspx

我的文本框目前看起来是这样的：

<TextBox Height="23" HorizontalAlignment="Left" Margin="118,60,0,0" Name="CreateUserCPRTextbox" VerticalAlignment="Top" Width="120" > 
       <TextBox.Text> 

        <Binding Path="Name" UpdateSourceTrigger="LostFocus"> 
         <Binding.ValidationRules> 
          <validators:TextRangeValidator 
         MinimumLength="10" 
         MaximumLength="10" 
         ErrorMessage="ID has to be 10 letters" /> 
         </Binding.ValidationRules> 
        </Binding> 
       </TextBox.Text> 

      </TextBox> 

我直接复制我的TextRangeValidator从示例在该网站上。当我失去对文本框的关注时，什么也没有发生。不管我输入什么。有任何想法吗？ :)

Answer 1

您已设置的Validation.ErrorTemplate？它是在example.You的Application.Resources定义如下可能已经错过了

<Application.Resources> 

     <Style TargetType="{x:Type TextBox}"> 
      <Setter Property="Validation.ErrorTemplate"> 
       <Setter.Value> 
        <ControlTemplate> 
         <DockPanel LastChildFill="True"> 

          <TextBlock DockPanel.Dock="Right" 
           Foreground="Orange" 
           Margin="5" 
           FontSize="12pt" 
           Text="{Binding ElementName=MyAdorner, 
          Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"> 
          </TextBlock> 

          <Border BorderBrush="Green" BorderThickness="3"> 
           <AdornedElementPlaceholder Name="MyAdorner" /> 
          </Border> 

         </DockPanel> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
      <Style.Triggers> 
       <Trigger Property="Validation.HasError" Value="true"> 
        <Setter Property="ToolTip" 
         Value="{Binding RelativeSource={RelativeSource Self}, 
        Path=(Validation.Errors)[0].ErrorContent}"/> 
       </Trigger> 
      </Style.Triggers> 
     </Style> 

    </Application.Resources> 

编辑

您的默认值不会触发验证routine.To迫使它来验证默认珍惜你必须设置

<validators:TextRangeValidator ValidatesOnTargetUpdated="True" 
         MinimumLength="10" 
         MaximumLength="10" 
         ErrorMessage="ID has to be 10 letters" /> 

Answer 2

我认为你需要设置ValidatesOnDataErrors=True在文本结合，使其工作

Answer 3

WPF的TextBox验证

<Style x:Key="TextBoxInError" TargetType="TextBox"> 
     <Setter Property="Validation.ErrorTemplate"> 
      <Setter.Value> 
       <ControlTemplate> 
        <DockPanel>       

         <Grid> 
          <Polygon Points="20,10,20,0 0,0" 
          Stroke="Black" 
          StrokeThickness="1" 
          Fill="Red" 
          HorizontalAlignment="Right" 
          VerticalAlignment="Top" 
          ToolTip="{Binding ElementName=adorner, 
           Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"/> 
          <AdornedElementPlaceholder x:Name="adorner"/> 


         <AdornedElementPlaceholder Name="customAdorner" VerticalAlignment="Center" > 
          <Border BorderBrush="red" BorderThickness="1" /> 
         </AdornedElementPlaceholder> 


         </Grid> 

         <Border Background="Red" DockPanel.Dock="right" Margin="5,0,0,0" 
          Width="150" Height="20" CornerRadius="5" 
          ToolTip="{Binding ElementName=customAdorner, 
             Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"> 
          <TextBlock Text= "{Binding ElementName=customAdorner, 
             Path=AdornedElement.(Validation.Errors)[0].ErrorContent}" VerticalAlignment="center" HorizontalAlignment="Left" 
           FontWeight="Bold" Foreground="white" Width="250" />        


         </Border> 


        </DockPanel> 



       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
     <Style.Triggers> 
      <Trigger Property="Validation.HasError" Value="True"> 
       <Setter Property="ToolTip" 
        Value="{Binding RelativeSource={x:Static RelativeSource.Self}, 
       Path=(Validation.Errors)[0].ErrorContent}" /> 

      </Trigger> 
     </Style.Triggers>   


    </Style>