WPF错误模板可见时不聚焦？ [英] WPF ErrorTemplate visible when not focused?

问题描述

我正在使用WPF验证来验证TextBox。我已经定义了这个模板：

 < Style x：Key =textBoxInErrorTargetType ={x：Type TextBox} BasedOn ={StaticResource StyleTextBox}> 
< Style.Triggers> 
< Trigger Property =Validation.HasErrorValue =true> 
< Setter Property =ToolTip
 Value ={Binding RelativeSource = {x：Static RelativeSource.Self}，
 Path =（Validation.Errors）[0] .ErrorContent} /> 
< Setter Property =BackgroundValue ={StaticResource TextBox_ErrorBackgroundBrush}/> 
< Setter Property =BorderBrushValue ={StaticResource TextBox_ErrorBorderBrush}/> 
< Setter Property =BorderThicknessValue =2/> 
< / Trigger> 
 < Setter Property =Validation.ErrorTemplate> 
< Setter.Value> 
< ControlTemplate> 
< DockPanel> 
< TextBlock DockPanel.Dock =RightForeground =RedFontSize =20Text =！/> 
< AdornedElementPlaceholder /> 
< / DockPanel> 
< / ControlTemplate> 
 < / Setter> 
< / style> 
  

TextBox位于TabItem的窗体中。
一切工作正常，但是当我选择其他TabItem时，'！'TextBlock保持可见。在许多其他情况下，这种行为是被观察到的 - 当扩展器展开等等时，Excklamation总是保持在同一个地方，尽管TextBox没有被显示出来。

解决方案

 < Style x：Key =ErrorTemplateTargetType = 控制 > 
< Setter Property =Validation.ErrorTemplate> 
< Setter.Value> 
 <！ - 在这里设置你的错误模板 - > 
 < / Setter> 
< Style.Triggers> 
<触发属性=IsVisible值=假> 
< Setter Property =Validation.ErrorTemplateValue ={x：Null}/> 
< / Trigger> 
 < / style> 
  

I'm using a WPF validation for TextBox validation. I have defined this Template:

<Style x:Key="textBoxInError" TargetType="{x:Type TextBox}" BasedOn="{StaticResource StyleTextBox}">        
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="true">
                <Setter Property="ToolTip"
                        Value="{Binding RelativeSource={x:Static RelativeSource.Self},
                        Path=(Validation.Errors)[0].ErrorContent}"/>
                <Setter Property="Background" Value="{StaticResource TextBox_ErrorBackgroundBrush}"/>
                <Setter Property="BorderBrush" Value="{StaticResource TextBox_ErrorBorderBrush}"/>
                <Setter Property="BorderThickness" Value="2"/>                      
            </Trigger>
        </Style.Triggers>
        <Setter Property="Validation.ErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <DockPanel>
                        <TextBlock DockPanel.Dock="Right" Foreground="Red" FontSize="20" Text="!"/>
                        <AdornedElementPlaceholder/>
                    </DockPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>  

The TextBox is located on a form in a TabItem. Everything works fine, but the '!' TextBlock stays visible when I choose other TabItems. This behaviour is observed in many other cases - when expander expands etc.. the Excklamation always stays visible on the same place, although the TextBox is not diplayed.

解决方案

This is what we do...

<Style x:Key="ErrorTemplate" TargetType="Control">
    <Setter Property="Validation.ErrorTemplate">
        <Setter.Value>
            <!--Set your error template in here-->
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsVisible" Value="false">
            <Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
        </Trigger>
    </Style.Triggers>
</Style>

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