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EndGetRequestStream Method

FileWebRequest.EndGetRequestStream Method

Ends an asynchronous request for a Stream instance that the application uses to write data.

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

'Declaration
Public Overrides Function EndGetRequestStream ( _
	asyncResult As IAsyncResult _
) As Stream
'Usage
Dim instance As FileWebRequest
Dim asyncResult As IAsyncResult
Dim returnValue As Stream

returnValue = instance.EndGetRequestStream(asyncResult)
public Stream EndGetRequestStream (
	IAsyncResult asyncResult
)
public override function EndGetRequestStream (
	asyncResult : IAsyncResult
) : Stream
Not applicable.

Parameters

asyncResult

An IAsyncResult that references the pending request for a stream.

Return Value

A Stream object that the application uses to write data.

Exception typeCondition

ArgumentNullException

asyncResult is a null reference (Nothing in Visual Basic).

The EndGetRequestStream method completes an asynchronous stream request that was started by the BeginGetRequestStream method.

NoteNote:

To avoid timing issues with garbage collection, be sure to close the response stream by calling the Close method on the stream returned by the GetResponseStream method after calling the EndGetResponse method.

The following example uses the EndGetRequestStream method to end the asynchronous request for a Stream object.

Public Class RequestDeclare
    Public myFileWebRequest As FileWebRequest
    Public userinput As [String]
    
    
    Public Sub New()
        myFileWebRequest = Nothing
    End Sub ' New
End Class ' RequestDeclare


Class FileWebRequest_reqbeginend
    Public Shared allDone As New ManualResetEvent(False)
    
    ' Entry point which delegates to C-style main Private Function.
    Public Overloads Shared Sub Main()
        Main(System.Environment.GetCommandLineArgs())
    End Sub
    
    
    Overloads Shared Sub Main(args() As String)
        If args.Length < 2 Then
            Console.WriteLine(ControlChars.Cr + "Please enter the file name as command line parameter:")
            Console.WriteLine("Usage:FileWebRequest_reqbeginend <systemname>/<sharedfoldername>/<filename>")
	    Console.WriteLine("Example: FileWebRequest_reqbeginend shafeeque/shaf/hello.txt")
        
        Else
            Try

                ' Place a webrequest.
                Dim myWebRequest As WebRequest = WebRequest.Create(("file://" + args(1)))
                
                ' Create an instance of the 'RequestDeclare' and associate the 'myWebRequest' to it.		
                Dim requestDeclare As New RequestDeclare()
                requestDeclare.myFileWebRequest = CType(myWebRequest, FileWebRequest)
                ' Set the 'Method' property of 'FileWebRequest' object to 'POST' method.
                requestDeclare.myFileWebRequest.Method = "POST"
                Console.WriteLine("Enter the string you want to write into the file:")
                requestDeclare.userinput = Console.ReadLine()
                
                ' Begin the Asynchronous request for getting file content using 'BeginGetRequestStream()' method .
                Dim r As IAsyncResult = CType(requestDeclare.myFileWebRequest.BeginGetRequestStream(AddressOf ReadCallback, requestDeclare), IAsyncResult)
                allDone.WaitOne()
                
                Console.Read()
            Catch e As ProtocolViolationException
                Console.WriteLine(("ProtocolViolationException is :" + e.Message))
            Catch e As InvalidOperationException
                Console.WriteLine(("InvalidOperationException is :" + e.Message))
            Catch e As UriFormatException
                Console.WriteLine(("UriFormatExceptionException is :" + e.Message))
            End Try

        End If 
    End Sub 'Main
    
    
    Private Shared Sub ReadCallback(ar As IAsyncResult)
        Try

            ' State of the request is asynchronous.
            Dim requestDeclare As RequestDeclare = CType(ar.AsyncState, RequestDeclare)
            Dim myFileWebRequest As FileWebRequest = requestDeclare.myFileWebRequest
            Dim sendToFile As [String] = requestDeclare.userinput
            
            ' End the Asynchronus request by calling the 'EndGetRequestStream()' method.
            Dim readStream As Stream = myFileWebRequest.EndGetRequestStream(ar)
            
            ' Convert the string into byte array.
            Dim encoder As New ASCIIEncoding()
            Dim byteArray As Byte() = encoder.GetBytes(sendToFile)
            
            ' Write to the stream.
            readStream.Write(byteArray, 0, sendToFile.Length)
            readStream.Close()
            allDone.Set()

            
            Console.WriteLine(ControlChars.Cr +"The String you entered was successfully written into the file.")
            Console.WriteLine(ControlChars.Cr +"Press Enter to continue.")

            Catch e As ApplicationException
            Console.WriteLine(("ApplicationException is :" + e.Message))
        End Try

    End Sub ' ReadCallback 

    public FileWebRequest myFileWebRequest;
    public String userInput;

    public RequestDeclare()
    {
        myFileWebRequest = null;
    } //RequestDeclare
} //RequestDeclare

class FileWebRequestReqBeginEnd
{
    public static ManualResetEvent allDone = new ManualResetEvent(false);

    public static void main(String[] args)
    {
        if (args.length < 1) {
            Console.WriteLine("\nPlease enter the file name as command " 
                + " line parameter:");
            Console.WriteLine("Usage:FileWebRequest_reqbeginend <systemname>" 
                + "/<sharedfoldername>/<filename>\nExample:" 
                + "FileWebRequest_reqbeginend shafeeque/shaf/hello.txt");
        }
        else {
            try {
                // Place a webrequest.
                WebRequest myWebRequest = WebRequest.Create("file://" 
                    + args[0]);

                // Create an instance of the 'RequestDeclare' and associate
                // the 'myWebRequest' to it.        
                RequestDeclare requestDeclare = new RequestDeclare();
                requestDeclare.myFileWebRequest = 
                    (FileWebRequest)(myWebRequest);

                // Set the 'Method' property of 'FileWebRequest' object to
                // 'POST' method.
                requestDeclare.myFileWebRequest.set_Method("POST");
                Console.WriteLine("Enter the string you want to write into " 
                    + " the file:");
                requestDeclare.userInput = Console.ReadLine();

                // Begin the Asynchronous request for getting file content
                // using 'BeginGetRequestStream()' method .
                IAsyncResult r = (IAsyncResult)(requestDeclare.
                    myFileWebRequest.BeginGetRequestStream(new AsyncCallback(
                    ReadCallback), requestDeclare));
                allDone.WaitOne();
                Console.Read();
            }
            catch (ProtocolViolationException e) {
                Console.WriteLine("ProtocolViolationException is :" 
                    + e.get_Message());
            }
            catch (InvalidOperationException e) {
                Console.WriteLine("InvalidOperationException is :" 
                    + e.get_Message());
            }
            catch (UriFormatException e) {
                Console.WriteLine("UriFormatExceptionException is :" 
                    + e.get_Message());
            }
        }
    } //main

    private static void ReadCallback(IAsyncResult ar)
    {
        try {
            // State of the request is asynchronous.
            RequestDeclare requestDeclare = (RequestDeclare)(
                ar.get_AsyncState());
            FileWebRequest myFileWebRequest = requestDeclare.myFileWebRequest;
            String sendToFile = requestDeclare.userInput;

            // End the Asynchronus request by calling the
            // 'EndGetRequestStream()' method.
            Stream readStream = myFileWebRequest.EndGetRequestStream(ar);

            // Convert the string into byte array.
            ASCIIEncoding encoder = new ASCIIEncoding();
            ubyte byteArray[] = encoder.GetBytes(sendToFile);

            // Write to the stream.
            readStream.Write(byteArray, 0, sendToFile.get_Length());
            readStream.Close();
            allDone.Set();
            Console.WriteLine("\nThe String you entered was successfully " 
                + "written into the file.");
            Console.WriteLine("\nPress Enter to continue.");
        }
        catch (ApplicationException e) {
            Console.WriteLine("ApplicationException is :" + e.get_Message());
        }
    } //ReadCallback

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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