HttpWebRequest.EndGetRequestStream 方法

參考

定義

命名空間:: System.Net

組件:: System.Net.Requests.dll

組件:: System.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

結束異步要求，讓 Stream 對象用來寫入數據。

多載

EndGetRequestStream(IAsyncResult, TransportContext)	結束異步要求，讓 Stream 對象用來寫入數據，並輸出與數據流相關聯的 TransportContext。
EndGetRequestStream(IAsyncResult)	結束異步要求，讓 Stream 對象用來寫入數據。

EndGetRequestStream(IAsyncResult, TransportContext)

來源:: HttpWebRequest.cs

來源:: HttpWebRequest.cs

來源:: HttpWebRequest.cs

結束異步要求，讓 Stream 對象用來寫入數據，並輸出與數據流相關聯的 TransportContext。

public:
 System::IO::Stream ^ EndGetRequestStream(IAsyncResult ^ asyncResult, [Runtime::InteropServices::Out] System::Net::TransportContext ^ % context);

public System.IO.Stream EndGetRequestStream (IAsyncResult asyncResult, out System.Net.TransportContext? context);

public System.IO.Stream EndGetRequestStream (IAsyncResult asyncResult, out System.Net.TransportContext context);

override this.EndGetRequestStream : IAsyncResult * TransportContext -> System.IO.Stream

Public Function EndGetRequestStream (asyncResult As IAsyncResult, ByRef context As TransportContext) As Stream

參數

asyncResult: IAsyncResult

數據流的暫止要求。

context: TransportContext

Stream的 TransportContext。

傳回

Stream

用來寫入要求數據的 Stream。

例外狀況

ArgumentException

asyncResult 不是由目前實例從呼叫 BeginGetRequestStream(AsyncCallback, Object)傳回。

ArgumentNullException

asyncResult null。

InvalidOperationException

先前使用 asyncResult呼叫這個方法。

IOException

要求未完成，而且沒有可用的數據流。

WebException

先前呼叫 Abort()。

-或-

處理要求時發生錯誤。

備註

謹慎

WebRequest、HttpWebRequest、ServicePoint和 WebClient 已經過時，您不應該將它們用於新的開發。請改用 HttpClient。

EndGetRequestStream 方法會完成由 BeginGetRequestStream 方法啟動之數據流的異步要求，並輸出與數據流相關聯的 TransportContext。傳回 Stream 物件之後，您可以使用 Stream.Write 方法，以 HttpWebRequest 傳送數據。

某些使用整合式 Windows 驗證搭配擴充保護的應用程式可能需要能夠查詢 HttpWebRequest 所使用的傳輸層，才能從基礎 TLS 通道擷取通道系結令牌（CBT）。 GetRequestStream 方法會針對具有要求本文的 HTTP 方法提供此資訊的存取權（POST 和 PUT 要求）。只有在應用程式實作自己的驗證，且需要存取 CBT 時，才需要此專案。

注意

如果您需要在將數據寫入數據流之前，先設定 ContentLength 屬性值。
您必須呼叫 Stream.Close 方法來關閉數據流，並釋放連接以供重複使用。無法關閉資料流會導致應用程式用盡連線。
當您在應用程式中啟用網路追蹤時，此成員會輸出追蹤資訊。如需詳細資訊，請參閱 .NET Framework中的網路追蹤。

另請參閱

適用於

EndGetRequestStream(IAsyncResult)

來源:: HttpWebRequest.cs

來源:: HttpWebRequest.cs

來源:: HttpWebRequest.cs

結束異步要求，讓 Stream 對象用來寫入數據。

public:
 override System::IO::Stream ^ EndGetRequestStream(IAsyncResult ^ asyncResult);

public override System.IO.Stream EndGetRequestStream (IAsyncResult asyncResult);

override this.EndGetRequestStream : IAsyncResult -> System.IO.Stream

Public Overrides Function EndGetRequestStream (asyncResult As IAsyncResult) As Stream

參數

asyncResult: IAsyncResult

數據流的暫止要求。

傳回

Stream

用來寫入要求數據的 Stream。

例外狀況

ArgumentNullException

asyncResult null。

IOException

要求未完成，而且沒有可用的數據流。

ArgumentException

asyncResult 不是由目前實例從呼叫 BeginGetRequestStream(AsyncCallback, Object)傳回。

InvalidOperationException

先前使用 asyncResult呼叫這個方法。

WebException

先前呼叫 Abort()。

-或-

處理要求時發生錯誤。

範例

下列程式代碼範例會使用 EndGetRequestStream 方法來結束數據流實例的異步要求。

#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::IO;
using namespace System::Text;
using namespace System::Threading;
ref class HttpWebRequestBeginGetRequest
{
public:
   static ManualResetEvent^ allDone = gcnew ManualResetEvent( false );
   static void Main()
   {
      
      // Create a new HttpWebRequest object.
      HttpWebRequest^ request = dynamic_cast<HttpWebRequest^>(WebRequest::Create( "http://www.contoso.com/example.aspx" ));
      
      // Set the ContentType property.
      request->ContentType = "application/x-www-form-urlencoded";
      
      // Set the Method property to 'POST' to post data to the Uri.
      request->Method = "POST";
      
      // Start the asynchronous operation.    
      AsyncCallback^ del = gcnew AsyncCallback(GetRequestStreamCallback);
      request->BeginGetRequestStream( del, request );
      
      // Keep the main thread from continuing while the asynchronous
      // operation completes. A real world application
      // could do something useful such as updating its user interface. 
      allDone->WaitOne();
    }
      

private:
    static void GetRequestStreamCallback(IAsyncResult^ asynchronousResult)
    {
        HttpWebRequest^ request = dynamic_cast<HttpWebRequest^>(asynchronousResult->AsyncState);
        
        // End the operation
        Stream^ postStream = request->EndGetRequestStream(asynchronousResult);

        Console::WriteLine("Please enter the input data to be posted:");
        String^ postData = Console::ReadLine();

        // Convert the string into a byte array.
        array<Byte>^ByteArray = Encoding::UTF8->GetBytes(postData);

        // Write to the request stream.
        postStream->Write(ByteArray, 0, postData->Length);
        postStream->Close();

        // Start the asynchronous operation to get the response
        AsyncCallback^ del = gcnew AsyncCallback(GetResponseCallback);
        request->BeginGetResponse(del, request);
    }

   static void GetResponseCallback(IAsyncResult^ asynchronousResult)
   {
      HttpWebRequest^ request = dynamic_cast<HttpWebRequest^>(asynchronousResult->AsyncState);

      // End the operation
      HttpWebResponse^ response = dynamic_cast<HttpWebResponse^>(request->EndGetResponse(asynchronousResult));
      Stream^ streamResponse = response->GetResponseStream();
      StreamReader^ streamRead = gcnew StreamReader(streamResponse);
      String^ responseString = streamRead->ReadToEnd();
      Console::WriteLine(responseString);
      // Close the stream object
      streamResponse->Close();
      streamRead->Close();

      // Release the HttpWebResponse
      response->Close();
      allDone->Set();
   }
};

void main()
{
   HttpWebRequestBeginGetRequest::Main();
}

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Threading;

class HttpWebRequestBeginGetRequest
{
    private static ManualResetEvent allDone = new ManualResetEvent(false);

    public static void Main(string[] args)
    {


        // Create a new HttpWebRequest object.
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.contoso.com/example.aspx");

        request.ContentType = "application/x-www-form-urlencoded";

        // Set the Method property to 'POST' to post data to the URI.
        request.Method = "POST";

        // start the asynchronous operation
        request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);

        // Keep the main thread from continuing while the asynchronous
        // operation completes. A real world application
        // could do something useful such as updating its user interface.
        allDone.WaitOne();
    }

    private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        // End the operation
        Stream postStream = request.EndGetRequestStream(asynchronousResult);

        Console.WriteLine("Please enter the input data to be posted:");
        string postData = Console.ReadLine();

        // Convert the string into a byte array.
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);

        // Write to the request stream.
        postStream.Write(byteArray, 0, postData.Length);
        postStream.Close();

        // Start the asynchronous operation to get the response
        request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
    }

    private static void GetResponseCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        // End the operation
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
        Stream streamResponse = response.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        string responseString = streamRead.ReadToEnd();
        Console.WriteLine(responseString);
        // Close the stream object
        streamResponse.Close();
        streamRead.Close();

        // Release the HttpWebResponse
        response.Close();
        allDone.Set();
    }
}

Imports System.Net
Imports System.IO
Imports System.Text
Imports System.Threading

Class HttpWebRequestBeginGetRequest
    Public Shared allDone As New ManualResetEvent(False)

    Shared Sub Main()


        ' Create a new HttpWebRequest object.
        Dim request As HttpWebRequest = CType(WebRequest.Create("http://www.contoso.com/example.aspx"), _
                 HttpWebRequest)

        ' Set the ContentType property.
        request.ContentType = "application/x-www-form-urlencoded"

        '  Set the Method property to 'POST' to post data to the URI.
        request.Method = "POST"

        ' Start the asynchronous operation.		
        Dim result As IAsyncResult = _
            CType(request.BeginGetRequestStream(AddressOf GetRequestStreamCallback, request), _
            IAsyncResult)

        ' Keep the main thread from continuing while the asynchronous
        ' operation completes. A real world application
        ' could do something useful such as updating its user interface. 
        allDone.WaitOne()
    End Sub

    Private Shared Sub GetRequestStreamCallback(ByVal asynchronousResult As IAsyncResult)
        Dim request As HttpWebRequest = CType(asynchronousResult.AsyncState, HttpWebRequest)
        
        ' End the operation
        Dim postStream As Stream = request.EndGetRequestStream(asynchronousResult)
        Console.WriteLine("Please enter the input data to be posted:")
        Dim postData As [String] = Console.ReadLine()
        
        '  Convert the string into byte array.
        Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)

        ' Write to the stream.
        postStream.Write(byteArray, 0, postData.Length)
        postStream.Close()

        ' Start the asynchronous operation to get the response
        Dim result As IAsyncResult = _
            CType(request.BeginGetResponse(AddressOf GetResponseCallback, request), _
            IAsyncResult)
    End Sub

    Private Shared Sub GetResponseCallback(ByVal asynchronousResult As IAsyncResult)
        Dim request As HttpWebRequest = CType(asynchronousResult.AsyncState, HttpWebRequest)
        
        '  Get the response.
        Dim response As HttpWebResponse = CType(request.EndGetResponse(asynchronousResult), _
           HttpWebResponse)
        
        Dim streamResponse As Stream = response.GetResponseStream()
        Dim streamRead As New StreamReader(streamResponse)
        Dim responseString As String = streamRead.ReadToEnd()
        
        Console.WriteLine(responseString)
        
        ' Close Stream object.
        streamResponse.Close()
        streamRead.Close()

        ' Release the HttpWebResponse.
        allDone.Set()
        response.Close()
    End Sub
            
End Class

備註

謹慎

WebRequest、HttpWebRequest、ServicePoint和 WebClient 已經過時，您不應該將它們用於新的開發。請改用 HttpClient。

EndGetRequestStream 方法會完成由 BeginGetRequestStream 方法啟動之數據流的異步要求。傳回 Stream 物件之後，您可以使用 Stream.Write 方法，以 HttpWebRequest 傳送數據。

注意

您必須先設定 ContentLength 屬性的值，才能將數據寫入數據流。
您必須呼叫 Stream.Close 方法來關閉數據流，並釋放連接以供重複使用。無法關閉資料流會導致應用程式用盡連線。
當您在應用程式中啟用網路追蹤時，此成員會輸出追蹤資訊。如需詳細資訊，請參閱 .NET Framework中的網路追蹤。

適用於

共用方式為

HttpWebRequest.EndGetRequestStream 方法

定義

多載

EndGetRequestStream(IAsyncResult, TransportContext)

參數

傳回

例外狀況

備註

另請參閱

適用於

EndGetRequestStream(IAsyncResult)

參數

傳回

例外狀況

範例

備註

適用於

其他資源