如果result返回null,则给出TextBlock默认值

Question

您好我正在尝试为文本块提供默认值,如果返回的结果为null

这是我正在尝试的!

返回的只是我设置的字符串格式!

 <TextBlock x:Name="NameTxtBlock" Grid.Column="0" Margin="0,0,40,0" FontFamily="Segoe UI" FontSize="14" Text="{Binding Name, StringFormat='Item Name: {0}'}"  Padding="2">
    <TextBlock.Style>
        <Style TargetType="TextBlock" >                                            
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=NameTxtBlock, Path=Text}" Value="{x:Null}">
                    <Setter Property="FontStyle" Value="Italic"/>
                    <Setter Property="Text" Value="No Name Found" />
                </DataTrigger>
                <DataTrigger Binding="{Binding ElementName=NameTxtBlock, Path=Text}" Value="{x:Static System:String.Empty}">
                    <Setter Property="FontStyle" Value="Italic"/>
                    <Setter Property="Text" Value="No Name Found" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

Answer 1

您可以使用TargetNullValue属性.这将返回TargetNullValue没有StringFormat如果绑定返回null.

<TextBlock Text="{Binding Name, StringFormat='Item Name: {0}', TargetNullValue='No Name Found'}" />