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WebClient::UploadDataAsync Method (Uri, array<Byte>)

Uploads a data buffer to a resource identified by a URI, using the POST method. This method does not block the calling thread.

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

[HostProtectionAttribute(SecurityAction::LinkDemand, ExternalThreading = true)]
public:
void UploadDataAsync(
	Uri^ address, 
	array<unsigned char>^ data
)

Parameters

address
Type: System::Uri

The URI of the resource to receive the data.

data
Type: array<System::Byte>

The data buffer to send to the resource.

ExceptionCondition
ArgumentNullException

The address parameter is nullptr.

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.

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.

This method uses the STOR command to upload an FTP resource. For an HTTP resource, the POST method is used.

NoteNote

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

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.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.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.

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