Export (0) Print
Expand All

WebClient::UploadValuesTaskAsync Method (String, NameValueCollection)

.NET Framework 4.5

Uploads the specified name/value collection to the resource identified by the specified URI as an asynchronous operation using a task object.

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

[ComVisibleAttribute(false)]
[HostProtectionAttribute(SecurityAction::LinkDemand, ExternalThreading = true)]
public:
Task<array<unsigned char>^>^ UploadValuesTaskAsync(
	String^ address, 
	NameValueCollection^ data
)

Parameters

address
Type: System::String

The URI of the resource to receive the collection.

data
Type: System.Collections.Specialized::NameValueCollection

The NameValueCollection to send to the resource.

Return Value

Type: System.Threading.Tasks::Task<array<Byte>>
Returns Task<TResult>.
The task object representing the asynchronous operation. The Result property on the task object returns a Byte array containing the response sent by the server.

ExceptionCondition
ArgumentNullException

The address parameter is nullptr.

-or-

The data parameter is nullptr.

WebException

The URI formed by combining BaseAddress, and address is invalid.

-or-

There was no response from the server hosting the resource.

-or-

An error occurred while opening the stream.

-or-

The Content-type header is not nullptr or "application/x-www-form-urlencoded".

This operation will not block. The returned Task<TResult> object will complete after the name/value collection has been uploaded to the resource. The name/value collection is sent asynchronously using thread resources that are automatically allocated from the thread pool.

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

If the underlying request is not understood by the server, the underlying protocol classes determine what occurs. Typically, a WebException is thrown with the Status property set to indicate the error.

If the Content-type header is nullptr, this method sets it to "application/x-www-form-urlencoded".

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: 4.6
Show:
© 2014 Microsoft