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WebClient.UploadDataAsync Method (Uri, String, Byte[], Object)

Uploads a data buffer to a resource identified by a URI, using the specified method and identifying token.

Namespace:  System.Net
Assembly:  System (in System.dll)

public function UploadDataAsync(
	address : Uri, 
	method : String, 
	data : byte[], 
	userToken : Object
)

Parameters

address
Type: System.Uri

The URI of the resource to receive the data.

method
Type: System.String

The HTTP method used to send the file to the resource. If null, the default is POST for http and STOR for ftp.

data
Type: System.Byte[]

The data buffer to send to the resource.

userToken
Type: System.Object

A user-defined object that is passed to the method invoked when the asynchronous operation completes.

ExceptionCondition
WebException

The URI formed by combining BaseAddress and address is invalid.

-or-

An error occurred while opening the stream.

-or-

There was no response from the server hosting the resource.

NoteNote:

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

This method sends a data buffer to a resource. The data buffer is sent asynchronously using thread resources that are automatically allocated from the thread pool. The data is not encoded. To receive notification when the data upload completes, add an event handler to the UploadDataCompleted event.

This method does not block the calling thread while the data is being sent. To send data and block while waiting for the server's response, use one of the UploadData methods.

Asynchronous operations that have not completed can be canceled using the CancelAsync method.

If the BaseAddress property is not an empty string (""), and address does not contain an absolute URI, address must be a relative URI that is combined with BaseAddress to form the absolute URI of the requested data. If the QueryString property is not an empty string, it is appended to address.

NoteNote:

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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, 3.0, 2.0

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