FileWebRequest.EndGetRequestStream-Methode
Beendet eine asynchrone Anforderung einer Stream-Instanz, die von der Anwendung zum Schreiben von Daten verwendet wird.
Namespace: System.Net
Assembly: System (in system.dll)
Syntax
'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 override Stream EndGetRequestStream (
IAsyncResult asyncResult
)
public:
virtual Stream^ EndGetRequestStream (
IAsyncResult^ asyncResult
) override
public Stream EndGetRequestStream (
IAsyncResult asyncResult
)
public override function EndGetRequestStream (
asyncResult : IAsyncResult
) : Stream
Parameter
- asyncResult
Ein IAsyncResult, das auf die ausstehende Anforderung eines Streams verweist.
Rückgabewert
Ein Stream-Objekt, das von der Anwendung zum Schreiben von Daten verwendet wird.
Ausnahmen
| Ausnahmetyp | Bedingung |
|---|---|
asyncResult ist NULL (Nothing in Visual Basic). |
Hinweise
Die EndGetRequestStream-Methode schließt eine asynchrone Streamanforderung ab, die mit der BeginGetRequestStream-Methode gestartet wurde.
Hinweis
Schließen Sie den Antwortstream unbedingt, indem Sie die Close-Methode für den von der GetResponseStream-Methode zurückgegebenen Stream nach dem Aufruf der EndGetResponse-Methode aufrufen. So können Probleme mit den Zeitabläufen der Garbage Collection vermieden werden.
Beispiel
Im folgenden Beispiel wird die EndGetRequestStream-Methode zum Beenden einer asynchronen Anforderung eines Stream-Objekts verwendet.
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 class RequestDeclare
{
public FileWebRequest myFileWebRequest;
public String userinput;
public RequestDeclare()
{
myFileWebRequest = null;
}
}
class FileWebRequest_reqbeginend
{
public static ManualResetEvent allDone = new ManualResetEvent(false);
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.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.Message);
}
catch(InvalidOperationException e)
{
Console.WriteLine("InvalidOperationException is :"+e.Message);
}
catch(UriFormatException e)
{
Console.WriteLine("UriFormatExceptionException is :"+e.Message);
}
}
}
private static void ReadCallback(IAsyncResult ar)
{
try
{
// State of the request is asynchronous.
RequestDeclare requestDeclare=(RequestDeclare) ar.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();
byte[] byteArray = encoder.GetBytes(sendToFile);
// Write to the stream.
readStream.Write(byteArray,0,sendToFile.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.Message);
}
}
public ref class RequestDeclare
{
public:
FileWebRequest^ myFileWebRequest;
String^ userinput;
RequestDeclare()
{
myFileWebRequest = nullptr;
}
};
ref class FileWebRequest_reqbeginend
{
public:
static ManualResetEvent^ allDone = gcnew ManualResetEvent( false );
static void ReadCallback( IAsyncResult^ ar )
{
try
{
// State of the request is asynchronous.
RequestDeclare^ requestDeclare = dynamic_cast<RequestDeclare^>(ar->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 = gcnew ASCIIEncoding;
array<Byte>^byteArray = encoder->GetBytes( sendToFile );
// Write to the stream.
readStream->Write( byteArray, 0, sendToFile->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 : {0}", e->Message );
}
}
};
int main()
{
array<String^>^args = Environment::GetCommandLineArgs();
if ( args->Length < 2 )
{
Console::WriteLine( "\nPlease enter the file name as command line parameter:" );
Console::WriteLine( "Usage:FileWebRequest_reqbeginend <systemname>/<sharedfoldername>/<filename>\n" );
Console::WriteLine( "Example:FileWebRequest_reqbeginend shafeeque/shaf/hello.txt" );
}
else
{
try
{
// Place a webrequest.
WebRequest^ myWebRequest = WebRequest::Create( String::Concat( "file://", args[ 1 ] ) );
// Create an instance of the 'RequestDeclare' and associate the 'myWebRequest' to it.
RequestDeclare^ requestDeclare = gcnew RequestDeclare;
requestDeclare->myFileWebRequest = dynamic_cast<FileWebRequest^>(myWebRequest);
// 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 .
IAsyncResult^ r = dynamic_cast<IAsyncResult^>(requestDeclare->myFileWebRequest->BeginGetRequestStream( gcnew AsyncCallback( &FileWebRequest_reqbeginend::ReadCallback ), requestDeclare ));
FileWebRequest_reqbeginend::allDone->WaitOne();
Console::Read();
}
catch ( ProtocolViolationException^ e )
{
Console::WriteLine( "ProtocolViolationException is : {0}", e->Message );
}
catch ( InvalidOperationException^ e )
{
Console::WriteLine( "InvalidOperationException is : {0}", e->Message );
}
catch ( UriFormatException^ e )
{
Console::WriteLine( "UriFormatExceptionException is : {0}", e->Message );
}
}
}
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
Plattformen
Windows 98, Windows 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
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
FileWebRequest-Klasse
FileWebRequest-Member
System.Net-Namespace
GetRequestStream
BeginGetRequestStream