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WebClient::UploadData Method (String, array<Byte>)

Uploads a data buffer to a resource identified by a URI.

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

public:
array<unsigned char>^ UploadData(
	String^ address, 
	array<unsigned char>^ data
)

Parameters

address
Type: System::String

The URI of the resource to receive the data.

data
Type: array<System::Byte>

The data buffer to send to the resource.

Return Value

Type: array<System::Byte>
A Byte array containing the body of the response from the resource.

ExceptionCondition
WebException

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

-or-

data is nullptr.

-or-

An error occurred while sending the data.

-or-

There was no response from the server hosting the resource.

The UploadData method sends a data buffer to a resource.

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

The UploadData method sends the content of data to the server without encoding it. This method blocks while uploading the data. To continue executing while waiting for the server's response, use one of the UploadDataAsync methods.

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.

The following code example converts a string entered from the console to a Byte array and posts the array to the specified server using UploadData. Any response from the server is displayed to the console.

Console::Write( "\nPlease enter the URI to post data to: " );
String^ uriString = Console::ReadLine();
// Create a new WebClient instance.
WebClient^ myWebClient = gcnew WebClient;
Console::WriteLine( "\nPlease enter the data to be posted to the URI {0}:", uriString );
String^ postData = Console::ReadLine();
// Apply ASCII Encoding to obtain the String* as a Byte array. 
array<Byte>^ postArray = Encoding::ASCII->GetBytes( postData );
Console::WriteLine( "Uploading to {0} ...", uriString );
myWebClient->Headers->Add( "Content-Type", "application/x-www-form-urlencoded" );

//UploadData implicitly sets HTTP POST as the request method. 
array<Byte>^responseArray = myWebClient->UploadData( uriString, postArray );

// Decode and display the response.
Console::WriteLine( "\nResponse received was: {0}", Encoding::ASCII->GetString( responseArray ) );
Console::Write(S"\nPlease enter the URI to post data to : ");
String* uriString = Console::ReadLine();
// Create a new WebClient instance.
WebClient* myWebClient = new WebClient();
Console::WriteLine(S"\nPlease enter the data to be posted to the URI {0}:", uriString);
String* postData = Console::ReadLine();
// Apply ASCII Encoding to obtain the String* as a Byte array.
Byte postArray[] = Encoding::ASCII->GetBytes(postData);
Console::WriteLine(S"Uploading to {0} ...", uriString);
myWebClient->Headers->Add(S"Content-Type", S"application/x-www-form-urlencoded");

//UploadData implicitly sets HTTP POST as the request method.
Byte responseArray[] = myWebClient->UploadData(uriString, postArray);

// Decode and display the response.
Console::WriteLine(S"\nResponse received was : {0}", Encoding::ASCII->GetString(responseArray));

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, 1.1, 1.0

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