ContentPropertyAttribute Class
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ContentPropertyAttribute Class


Indicates which property of a type is the XAML content property. A XAML processor uses this information when processing XAML child elements of XAML representations of the attributed type.

Namespace:   System.Windows.Markup
Assembly:  System.Xaml (in System.Xaml.dll)


[AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple = false, 
	Inherited = true)]
public sealed class ContentPropertyAttribute : Attribute


Initializes a new instance of the ContentPropertyAttribute class.


Initializes a new instance of the ContentPropertyAttribute class, by using the specified name.


Gets the name of the property that is the content property.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

If the associated property of a ContentPropertyAttribute is not of type string or object, a XAML processor attempts to identify a value conversion technique. The first check is for native type conversion, either of the XAML language primitives or of specific native conversions enabled by that particular XAML writer implementation. The next step is to look for a type converter. In the .NET implementations, a type converter is identified based on TypeConverterAttribute on either the member level or type level definition that applies. If no value conversion can be identified, a XAML object writer typically throws an exception.

In order to accept more than a single object element as content, the type of the XAML content property must be supportable as a collection type.

Because of the Inherited=true declaration of the attribute, a value for a ContentPropertyAttribute normally applies a content property designation to all derived classes as well. Applying an empty ContentPropertyAttribute enables a derived class to remove a declaration of a content property attribute by a base class (and to note that the class has no content property). Applying a differently named ContentPropertyAttribute replaces the inherited ContentPropertyAttribute with the new one.

In previous versions of the .NET Framework, this class existed in the WPF-specific assembly WindowsBase, and also had a parallel implementation in Windows Communication Foundation (WCF). In .NET Framework 4, ContentPropertyAttribute is in the System.Xaml assembly. For more information, see Types Migrated from WPF to System.Xaml.

An example of a class in Windows Presentation Foundation (WPF) that uses the ContentPropertyAttribute is ContentControl, which the Button class inherits from. The property Content on the ContentControl is the content property set by the ContentPropertyAttribute. If a Button is instantiate in XAML Content of the Button will be set to the element that is between the start and end button tags.

The following example creates a class named Film that has a ContentPropertyAttribute applied. The property named Title is indicated as the content property.

public class Film
    public Film()

    public string Title
        get { return _title; }
        set { _title = value; }

    private string _title;

.NET Framework
Available since 3.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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