相关疑难解决方法(0)

我的WPF应用程序中有一个TextBox.我已经为验证错误定义了一个ControlTemplate,如下所示:

<ControlTemplate x:Key="validationTemplate">
    <DockPanel LastChildFill="True">
         <TextBlock DockPanel.Dock="Bottom"  Text="Invalid Input: "></TextBlock>
                 <AdornedElementPlaceholder />
    </DockPanel>
</ControlTemplate>

我的TextBox如下:

<TextBox Validation.ErrorTemplate="{StaticResource validationTemplate}">                                              
    <TextBox.Text>
        <Binding Path="TEXT1" ValidatesOnDataErrors="True" validatesOnExceptions="True">
         </Binding>
    </TextBox.Text>
</TextBox>

现在,如果我的TextBox添加了ValidationRule,然后我在那里验证,错误模板正确应用.但由于其他一些问题我无法做到这一点.

所以我必须在PreviewLostKeyboardFocus中验证TextBox的内容.我正在验证TextBox.现在我想在后面的代码中为TextBox设置错误模板,但我无法做到!!

我尝试了这个,但它并不像有意的那样工作::

private void blockTextBox_PreviewLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
    {
        TextBox txtBox = sender as TextBox;
        txtBox.Template = this.FindResource("validationTemplate") as ControlTemplate;

        //this behaves strange; it removes the TextBox and places the ErrorTemplate. 
       //I want it to behave like the way WPF does internally wherein it places 
       //the error template around TExtBox
    }

问题1:我想知道如何将错误模板添加到TextBox

问题2:我想知道如何从代码中设置控件模板的错误消息.例如,我想将默认错误消息"Invalid …

所以我有一个像这个简化版本的控件：

<local:ImageMapField x:Class="ImageApp.WPF.Controls.ImageMapContentField"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:ImageApp.WPF.Controls"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
                        x:Name="Me">

    <Grid HorizontalAlignment="Left">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="150" />
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Label Grid.Column="0" HorizontalAlignment="Stretch" Style="{DynamicResource BaseLabelStyle}">
            <TextBlock Text="{Binding Header, RelativeSource={RelativeSource AncestorType=local:ImageMapContentField, Mode=FindAncestor}}" TextWrapping="WrapWithOverflow"></TextBlock>
        </Label>
        <StackPanel Grid.Column="1">
            <Image />
            <Border Margin="20,5,5,2">
                <ContentPresenter Content="{Binding DataEntryContent, ElementName=Me}" />
            </Border>
        </StackPanel>
    </Grid>

</local:ImageMapField>

我像这样使用它：

<controls:ImageMapContentField Header="Foo Date" 
                                FieldName="FooDate"
                                ImageSource="{Binding MyImage, Mode=TwoWay}"
                                ItemsSource="{Binding Map.Items}"
                                Zoom="{Binding MapFieldZoom}">
    <controls:ImageMapContentField.DataEntryContent>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <TextBox Grid.Column="0" Text="{Binding MyDate, StringFormat=MM/dd/yyyy, ValidatesOnDataErrors=True, NotifyOnValidationError=True}">
                <controls:WatermarkService.Watermark>
                    <TextBlock>Date</TextBlock>
                </controls:WatermarkService.Watermark> …