WebClient.DownloadDataTaskAsync Method

Definition

Namespace:

System.Net

Assembly:

System.Net.WebClient.dll

Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object. These methods do not block the calling thread.

Overloads

DownloadDataTaskAsync(String)	Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object.
DownloadDataTaskAsync(Uri)	Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object.

DownloadDataTaskAsync(String)

Source:

WebClient.cs

Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object.

public:
 System::Threading::Tasks::Task<cli::array <System::Byte> ^> ^ DownloadDataTaskAsync(System::String ^ address);

public System.Threading.Tasks.Task<byte[]> DownloadDataTaskAsync (string address);

member this.DownloadDataTaskAsync : string -> System.Threading.Tasks.Task<byte[]>

Public Function DownloadDataTaskAsync (address As String) As Task(Of Byte())

Parameters

address

String

The URI of the resource to download.

Returns

Task<Byte[]>

The task object representing the asynchronous operation. The Result property on the task object returns a Byte array containing the downloaded resource.

Exceptions

ArgumentNullException

The address parameter is null.

WebException

The URI formed by combining BaseAddress and address is invalid.

-or-

An error occurred while downloading the resource.

Remarks

Caution

WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete, and you shouldn't use them for new development. Use HttpClient instead.

This operation will not block. The returned Task<TResult> object will complete after the data resource has been downloaded.

This method retrieves the specified resource using the default method for the protocol associated with the URI scheme specified in the address parameter. The data is downloaded asynchronously using thread resources that are automatically allocated from the thread pool.

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 RETR command to download an FTP resource. For an HTTP resource, the GET method is used.

Note

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

The following code example requests data from a server and displays the data returned. It assumes that remoteUri contains a valid URI for the requested data.

DownloadDataTaskAsync(Uri)

Source:

WebClient.cs

Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object.

public:
 System::Threading::Tasks::Task<cli::array <System::Byte> ^> ^ DownloadDataTaskAsync(Uri ^ address);

public System.Threading.Tasks.Task<byte[]> DownloadDataTaskAsync (Uri address);

member this.DownloadDataTaskAsync : Uri -> System.Threading.Tasks.Task<byte[]>

Public Function DownloadDataTaskAsync (address As Uri) As Task(Of Byte())

Parameters

address

Uri

The URI of the resource to download.

Returns

Task<Byte[]>

The task object representing the asynchronous operation. The Result property on the task object returns a Byte array containing the downloaded resource.

Exceptions

ArgumentNullException

The address parameter is null.

WebException

The URI formed by combining BaseAddress and address is invalid.

-or-

An error occurred while downloading the resource.

Remarks

Caution

WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete, and you shouldn't use them for new development. Use HttpClient instead.

This operation will not block. The returned Task<TResult> object will complete after the data resource has been downloaded.

This method retrieves the specified resource using the default method for the protocol associated with the URI scheme specified in the address parameter. The data is downloaded asynchronously using thread resources that are automatically allocated from the thread pool.

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 RETR command to download an FTP resource. For an HTTP resource, the GET method is used.

Note

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