Artigo
11/18/2011

StreamResourceInfo Class

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

Provides resource stream information for application resources or other packages obtained through the GetResourceStream method.

Inheritance Hierarchy

System.Object
System.Windows.Resources.StreamResourceInfo

Namespace: System.Windows.Resources
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public Class StreamResourceInfo

public class StreamResourceInfo

The StreamResourceInfo type exposes the following members.

Constructors

	Name	Description
	StreamResourceInfo	Initializes a new instance of the StreamResourceInfo class.

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Properties

	Name	Description
	ContentType	Gets the MIME type of the content in the stream.
	Stream	Gets the stream that is contained by the resource.

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Methods

	Name	Description
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The StreamResourceInfo class is not just for pure application model scenarios. You can use a StreamResourceInfo to process a stream that happens to be a package (a XAP or ZIP file). This is useful if you have returned an asynchronous stream result from a WebClient request and the returned stream is really a package that contains multiple parts. To get at these parts, you must request each of the parts as a URI that you specify in the GetResourceStream call, with the initial package specified as the StreamResourceInfo for the zipPackageStreamResourceInfo parameter.

Examples

The following code example demonstrates how to use this class.

Imports System.Windows.Resources
Imports System.Windows.Media.Imaging

Partial Public Class PageShort
    Inherits UserControl

    Public Sub New()
        InitializeComponent()

        ' Load image resource files included in the application package 
        ' and resources that are embedded in assemblies included in the
        ' application package.

        ' Load an image resource file embedded in the application assembly.
        Dim img1 As Image = LoadImage( _
            "/SilverlightApplication;component/EmbeddedInApplicationAssembly.png")
        Me.stackPanel.Children.Add(img1)

        ' Load an image resource file included the application package.
        Dim img2 As Image = LoadImage("IncludedInApplicationPackage.png")
        Me.stackPanel.Children.Add(img2)

        ' Load an image resource file embedded in a library assembly, 
        ' which is included in the application package.
        Dim img3 As Image = LoadImage( _
            "/SilverlightLibrary;component/EmbeddedInLibraryAssembly.png")
        Me.stackPanel.Children.Add(img3)

    End Sub

    Public Function LoadImage(ByVal relativeUriString As String) As Image

        ' Get the image stream at the specified URI that
        ' is relative to the application package root.
        Dim uri As New Uri(relativeUriString, UriKind.Relative)
        Dim sri As StreamResourceInfo = Application.GetResourceStream(uri)

        ' Convert the stream to an Image object.
        Dim bi As New BitmapImage()
        bi.SetSource(sri.Stream)
        Dim img As New Image()
        img.Source = bi

        Return img

    End Function

End Class

using System; // Uri
using System.IO; // Stream
using System.Windows; // Application
using System.Windows.Controls; // TextBlock, Image
using System.Windows.Media.Imaging; // BitmapImage
using System.Windows.Resources; // StreamResourceInfo

namespace SilverlightApplication
{
    public partial class PageShort : UserControl
    {
        public PageShort()
        {
            InitializeComponent();

            // Load image resource files included in the application package 
            // and resources that are embedded in assemblies included in the
            // application package.

            // Load an image resource file embedded in the application assembly.
            Image img1 = LoadImage(
                "/SilverlightApplication;component/EmbeddedInApplicationAssembly.png");
            this.stackPanel.Children.Add(img1);

            // Load an image resource file included the application package.
            Image img2 = LoadImage("IncludedInApplicationPackage.png");
            this.stackPanel.Children.Add(img2);

            // Load an image resource file embedded in a library assembly, 
            // which is included in the application package.
            Image img3 = LoadImage(
                "/SilverlightLibrary;component/EmbeddedInLibraryAssembly.png");
            this.stackPanel.Children.Add(img3);
        }

        public Image LoadImage(string relativeUriString)
        {
            // Get the image stream at the specified URI that
            // is relative to the application package root.
            Uri uri = new Uri(relativeUriString, UriKind.Relative);
            StreamResourceInfo sri = Application.GetResourceStream(uri);

            // Convert the stream to an Image object.
            BitmapImage bi = new BitmapImage();
            bi.SetSource(sri.Stream);
            Image img = new Image();
            img.Source = bi;

            return img;
        }
    }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, 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.

Thread Safety

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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