WPF / XAML-选中单选按钮时，DataTriggers设置ValidatesOnDataErrors = false / true [英] WPF/XAML - DataTriggers to set ValidatesOnDataErrors = false/true when a radio button is checked

问题描述

我正在开发一个使用DataAnnotations实现MVVM设计模式的应用程序。该应用程序是动态生成的页面列表。在这些页面之一上，我有10个必填字段，带有2个是/否单选按钮。这10个字段分为两组，每组都用border标签包装。每个边框的可见性都与用于隐藏/可见的单选按钮绑定。

I am working on an application that implements the MVVM design pattern with DataAnnotations. The application is a dynamically generated list of pages. On one of those pages, I have 10 required fields with 2 yes/no radio buttons. Those 10 fields are divided into two groups and each group is wwapped with a border tag. Each border's visibility is bound with the radio buttons for hidden/visible.

我的问题是是否选择了yes，并显示了相关的5个必需的文本框，如何将ValidatesOnDataErrors设置为false / true并清除其他文本框的值隐藏了必需的TextBoxes吗？

My question is if yes was selected and the related 5 required text boxes are displayed how can i set the ValidatesOnDataErrors to false/true and clear the text boxes values of the other hidden required TextBoxes?

这里是一个代码段。

谢谢

<Border>
<Border.Style>
  <Style>
   <Setter Property="Border.Visibility" Value="Hidden"></Setter>
    <Style.Triggers>
     <DataTrigger Binding="{Binding ElementName=PresentlyEmployed_yes, Path=IsChecked}"
                  Value="True">
       <Setter Property="Border.Visibility" Value="Visible"></Setter>
     </DataTrigger>
    </Style.Triggers>
   </Style>
  </Border.Style>
  <Grid Height="Auto" Width="Auto">
   <Label Name="JobTitle"
               Content="{x:Static properties:Resources.JobTitlelbl}" />
    <TextBox Name="JobTitle" Text="{Binding JobTitle, Mode=TwoWay, 
     ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}">
     <TextBox.Style>
      <Style TargetType="{x:Type TextBox}">
       <Setter Property="Text" Value="{Binding PrimaryInsuredBusinessDuties, Mode=TwoWay,
          UpdateSourceTrigger=PropertyChanged, IsAsync=True}" />
       <Style.Triggers>
       <DataTrigger Binding="{Binding ElementName=PresentlyEmployed_yes, Path=IsChecked}"
          Value="True">
        <Setter Property="Text" Value="{Binding JobTitle, Mode=TwoWay, 
           ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
       </DataTrigger>
       <DataTrigger Binding="{Binding ElementName=PresentlyEmployed_yes, Path=IsChecked}"
         Value="False">
        <Setter Property="Text" Value="{Binding JobTitle, Mode=TwoWay, 
          ValidatesOnDataErrors=False, UpdateSourceTrigger=PropertyChanged}"></Setter>
       </DataTrigger>
      </Style.Triggers>
     </Style>
    </TextBox.Style>
   </TextBox>
  </Grid>
</Border>

推荐答案

尝试设置 Validation。模板到 {x：Null} ，如果它不显示验证错误

Try setting the Validation.Template to {x:Null} if it shouldn't show the Validation Error

<StackPanel>
    <ListBox x:Name="MyListBox" SelectedIndex="0">
        <ListBoxItem>Validate Value 1</ListBoxItem>
        <ListBoxItem>Validate Value 2</ListBoxItem>
    </ListBox>

    <TextBox Text="{Binding Value1, ValidatesOnDataErrors=True}">
        <TextBox.Style>
            <Style TargetType="{x:Type TextBox}">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding SelectedIndex, ElementName=MyListBox}" Value="1" >
                        <Setter Property="Validation.ErrorTemplate" Value="{x:Null}" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBox.Style>
    </TextBox>
    <TextBox Text="{Binding Value2, ValidatesOnDataErrors=True}">
        <TextBox.Style>
            <Style TargetType="{x:Type TextBox}">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding SelectedIndex, ElementName=MyListBox}" Value="0" >
                        <Setter Property="Validation.ErrorTemplate" Value="{x:Null}" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBox.Style>
    </TextBox>
</StackPanel>

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