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BindingBase.TargetNullValue Property

 

Gets or sets the value that is used in the target when the value of the source is null.

Namespace:   System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)

public object TargetNullValue { get; set; }

Property Value

Type: System.Object

The value that is used in the target when the value of the source is null.

<objectTargetNullValue="nullValue" />

- or –

<object>
  <object.TargetNullValue>
    nullValue
    </object.TargetNullValue>
</object>

nullValue

An attribute or object element value of the same type as the target property. See that type's documentation for XAML usage information. That type may or may not support attribute syntax for its values, or may or may not support object element syntax (which requires a default constructor on that type).

The following example binds a TextBox to a property of an object. If the property is null, the TextBox displays "please enter a string."

<TextBox Width="150"
         Text="{Binding Source={StaticResource object2}, 
  Path=PropertyB, BindingGroupName=bindingGroup, 
  TargetNullValue=please enter a string}" />

.NET Framework
Available since 3.0
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 7.1
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