Edit default Errotemplate layout

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I implemented the interface Idataerrorinfo, that is working according to the image below.

Error template

I didn’t create my Errortemplate, what is being used is the . NET default.

I wonder if there is somewhere the XAML code of this template error, because my intention is to create my own template error based on it.

I already searched the MSDN and tried to use the WPF Tree Visualizer, but I was not successful.

c# wpf

1 answer

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Explain in detail how to create/change a template it’s not easy to do it here.

I leave two examples that I use:

  • Redborderonerror - Apply a red border and show a tooltip with the error message when you place the mouse over it.

    <Style x:Key="RedBorderOnError" TargetType="{x:Type TextBox}">

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

  • Redtextonerror - Apply the red color to Foreground and show a tooltip with the error message when you place the mouse over it. 

    <Style x:Key="RedTextOnError" TargetType="{x:Type TextBox}">
    <Setter Property="Validation.ErrorTemplate">
        <Setter.Value>
            <ControlTemplate>
                <DockPanel LastChildFill="True">
                    <Border BorderBrush="Transparent" BorderThickness="1">
                        <AdornedElementPlaceholder />
                    </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).CurrentItem.ErrorContent}"/>
            <Setter Property="Foreground" Value="Red"></Setter>
        </Trigger>
    </Style.Triggers>
</Style>

Attribute the Style at the Textbox in this way: 

<TextBox ........
    Style="{StaticResource RedBorderOnError}"
    .....
    ....../>

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