WPF Conditional Binding when backing object is NULL

Question

So i have a TextBlock like below where i am displaying a name in the middle with the binding Name.

<TextBlock>
    <Run Text="Hello"/> <Run Text="{Binding Name}" /><Run Text=","/>
</TextBlock>

Is there any way to put a condition here to that when 'Name' is null or even better if the current DataContext object is null then i dont display anything at all?

Possible duplicate of Conditional text binding XAML

mjwills
– mjwills

2019-01-26 12:05:01 +00:00
Commented Jan 26, 2019 at 12:05 — mjwills
– mjwills, Commented Jan 26, 2019 at 12:05

Fruchtzwerg · Accepted Answer · 2019-01-26 12:17:54Z

5

You can update the style of your TextBlock by setting the Visibility to Hidden or Collapsed to hide it. Just add a DataTrigger for the case of an empty string like Value="" and a null value like Value="{x:Null} bound to the Name property:

<TextBlock.Style>
    <Style TargetType="TextBlock">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Name}" Value="">
                <Setter Property="Visibility" Value="Hidden"/>
            </DataTrigger>
            <DataTrigger Binding="{Binding Name}" Value="{x:Null}">
                <Setter Property="Visibility" Value="Hidden"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</TextBlock.Style>

answered Jan 26, 2019 at 12:17

Fruchtzwerg

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