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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)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public Object TargetNullValue { get; set; }
<object TargetNullValue="nullValue" /><object>
  <object.TargetNullValue>
    nullValue
    </object.TargetNullValue>
</object>

XAML Values

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).

Property Value

Type: System.Object
The value that is used in the target when the value of the source is null.

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

Supported in: 4.6, 4.5, 4, 3.5 SP1, 3.0 SP2

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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