Template10.Validation / UWP / C＃如何制作新设计？ ，错误：集合属性__implicit_propery为null

Question

我想在验证错误发生时修改“Template10.Validation”样式。 这是我的目标风格。

我试过......但是有一些奇怪的错误......

<validate:ControlWrapper Property="{Binding SettingEmailModel}" PropertyName="EmailReceivers">                                       

    <validate:ControlWrapper.Template>                                                                                               

        <ControlTemplate TargetType="validate:ControlWrapper">                                                                       


            <StackPanel DataContext="{TemplateBinding Property}">                                                                    
                <TextBlock Text="IsValid" />                                                                                         
                <TextBlock Text="{Binding IsValid}" />                                                                               
                <TextBlock Text="Errors" />                                                                                          
                <TextBlock Text="{Binding Errors.Count}" />                                                                          
                <ContentPresenter Content="{TemplateBinding Content}" />                                                             
                <TextBlock x:Name="ValidationNotifyTextBlock" Text="{Binding Errors[0]}">                                            
                    <Interactivity:Interaction.Behaviors>                                                                            
                        <Core:DataTriggerBehavior Binding="{Binding IsValid}" Value="True">                                          
                            <Core:ChangePropertyAction TargetObject="{Binding ElementName=ValidationNotifyTextBlock}"                
                                                       PropertyName="Foreground" Value="Red"/>                                       
                        </Core:DataTriggerBehavior>                                                                                  
                        <Core:DataTriggerBehavior Binding="{Binding IsValid}" Value="False">                                         
                            <Core:ChangePropertyAction TargetObject="{Binding ElementName=ValidationNotifyTextBlock}"                
                                                       PropertyName="Foreground" Value="Black"/>                                     
                        </Core:DataTriggerBehavior>                                                                                  
                    </Interactivity:Interaction.Behaviors>                                                                           
                </TextBlock>                                                                                                         
            </StackPanel>                                                                                                            
        </ControlTemplate>                                                                                                           

    </validate:ControlWrapper.Template>                                                                                              

    <Grid>                                                                                                                           
        <TextBox Text="{Binding SettingEmailModel.EmailReceivers, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"                 
                 MinHeight="400" Style="{StaticResource SettingStyle_MultilineTextBox}"/>                                            

    </Grid>                                                                                                                          
</validate:ControlWrapper>                                                                                                           

这是错误消息“Collection property __implicit_propery is null”

1）我尝试了版本1.1和版本2.0的“Microsoft.Xaml.Behaviors.Uwp.Managed”

我不知道为什么会发生错误.. 请给我建议，或者你能为我的设计制作一个风格吗？

Answer 1

根据您的要求，您可以为已经验证的ErrorTextBoxStyle创建TextBox。并在以下ControlWrapper ControlTemplate。

中使用它

<validate:ControlWrapper PropertyName="FirstName">
    <validate:ControlWrapper.Template>
        <ControlTemplate TargetType="validate:ControlWrapper">
            <Grid>
                <ContentPresenter Content="{TemplateBinding Content}"/>
            </Grid>
        </ControlTemplate>
    </validate:ControlWrapper.Template>
    <TextBox
        Width="{StaticResource FieldWidth}"
        Header="First Name"
        Text="{Binding FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
        <Interactivity:Interaction.Behaviors>
            <behaviors:ValidationBehavior PropertyName="FirstName">
                <behaviors:ValidationBehavior.WhenValidActions>
                    <Core:ChangePropertyAction PropertyName="Style" Value="{x:Null}" />
                </behaviors:ValidationBehavior.WhenValidActions>
                <behaviors:ValidationBehavior.WhenInvalidActions>
                    <Core:ChangePropertyAction PropertyName="Style" Value="{StaticResource ErrorTextBoxStyle}" />
                </behaviors:ValidationBehavior.WhenInvalidActions>
            </behaviors:ValidationBehavior>
        </Interactivity:Interaction.Behaviors>
    </TextBox>
</validate:ControlWrapper>

<强> ErrorTextBoxStyle

<Style x:Key="ErrorTextBoxStyle" TargetType="TextBox">
    <Setter Property="Foreground" Value="White" />
    <Setter Property="BorderBrush"  Value="Red"/>
</Style>