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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.

System.Object
  System.Attribute
    System.Windows.Markup.ContentPropertyAttribute

Namespace:  System.Windows.Markup
Assembly:  System.Xaml (in System.Xaml.dll)
XMLNS for XAML: Not mapped to an xmlns.

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

The ContentPropertyAttribute type exposes the following members.

  NameDescription
Public methodContentPropertyAttribute()Initializes a new instance of the ContentPropertyAttribute class.
Public methodContentPropertyAttribute(String)Initializes a new instance of the ContentPropertyAttribute class, by using the specified name.
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  NameDescription
Public propertyNameGets the name of the property that is the content property.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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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.

WPF Usage Notes

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.

[ContentProperty("Title")]
public class Film
{
    public Film()
    {
    }

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

    private string _title;
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.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.

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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