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DataServiceContext.SetSaveStream Method (Object, Stream, Boolean, DataServiceRequestArgs)

Sets a new data stream as the binary property of an entity, with the specified settings in the request message.

Namespace:  System.Data.Services.Client
Assembly:  System.Data.Services.Client (in System.Data.Services.Client.dll)

public void SetSaveStream(
	Object entity,
	Stream stream,
	bool closeStream,
	DataServiceRequestArgs args


Type: System.Object

The entity that has a binary property to which to assign the data stream.

Type: System.IO.Stream

The Stream from which to read the binary data.

Type: System.Boolean

A Boolean value that determines whether the data stream is closed when the SaveChanges method is completed.

Type: System.Data.Services.Client.DataServiceRequestArgs

An instance of the DataServiceRequestArgs class that contains settings for the HTTP request message.


Any of the parameters supplied to the method are null.


The entity is not being tracked by this DataServiceContext instance.


The entity has the MediaEntryAttribute applied.

This topic describes new functionality in ADO.NET Data Services that is available as an update to the .NET Framework version 3.5 Service Pack 1. You can download and install the update from the Microsoft Download Center.

The SetSaveStream method sets the binary stream that is the Media Resource that is associated with the entity, which is called a Media Link Entry.

Calling the SetSaveStream method marks the entity as a Media Link Entry. The entity state is also set to Modified so that the stream will be sent to the data service the next time that the SaveChanges method is called.

The SetSaveStream method reads the Stream through to the end. A Seek operation is not tried on the Stream.

When closeStream is true, the SaveChanges method closes the stream before it returns. The stream is closed even when an error occurs and the stream is not read.

When the entity has the MediaEntryAttribute applied, the Media Resource cannot be a data stream. Remove this attribute before you try to set the data stream for the entity.

No validation is performed on the headers that are set in args. Therefore, do not change an HTTP header in a way that changes the meaning of the request.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5 SP1