Articolo
11/17/2011

XObject.Annotation<T> Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Get the first annotation object of the specified type from this XObject.

Namespace: System.Xml.Linq
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)

Syntax

'Declaration
Public Function Annotation(Of T As Class) As T

public T Annotation<T>()
where T : class

Type Parameters

T
The type of the annotation to retrieve.

Return Value

Type: T
The first annotation object that matches the specified type, or nulla null reference (Nothing in Visual Basic) if no annotation is of the specified type.

Examples

The following class is used in the example below:

Public Class MyAnnotation
    Private _tag As String

    Property Tag() As String
        Get
            Return Me._tag
        End Get
        Set(ByVal Value As String)
            Me._tag = Value
        End Set
    End Property

    Public Sub New(ByVal tag As String)
        Me._tag = tag
    End Sub
End Class

public class MyAnnotation
{
    private string tag;
    public string Tag { get { return tag; } set { tag = value; } }
    public MyAnnotation(string tag)
    {
        this.tag = tag;
    }
}

The following example adds an annotation to an element, and then retrieves it through this method.

Dim output As New StringBuilder
Dim ma As MyAnnotation = New MyAnnotation("T1")
Dim root As XElement = <Root>content</Root>
root.AddAnnotation(ma)

Dim ma2 As MyAnnotation = root.Annotation(Of MyAnnotation)()
output.Append(ma2.Tag)
output.Append(Environment.NewLine)

OutputTextBlock.Text = output.ToString()

StringBuilder output = new StringBuilder();
MyAnnotation ma = new MyAnnotation("T1");
XElement root = new XElement("Root", "content");
root.AddAnnotation(ma);

MyAnnotation ma2 = root.Annotation<MyAnnotation>();
output.Append(ma2.Tag + Environment.NewLine);

OutputTextBlock.Text = output.ToString();

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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