WebClient.UploadFileTaskAsync Method (String, String)
Uploads the specified local file to a resource as an asynchronous operation using a task object.
Assembly: System (in System.dll)
[ComVisibleAttribute(false)] [HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)] public Task<byte> UploadFileTaskAsync( string address, string fileName )
- Type: System.String
The URI of the resource to receive the file. For HTTP resources, this URI must identify a resource that can accept a request sent with the POST method, such as a script or ASP page.
- Type: System.String
The local file to send to the resource.
The address parameter is null.
The fileName parameter is null.
The URI formed by combining BaseAddress and address is invalid.
fileName is null, is Empty, contains invalid character, or the specified path to the file does not exist.
An error occurred while opening the stream.
There was no response from the server hosting the resource.
The Content-type header begins with multipart.
This operation will not block. The returned Task<TResult> object will complete after the file has been uploaded to the resource. The file 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 BaseAddress property is not an empty string (""), 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.
This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.
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.