WebRequest.BeginGetResponse(AsyncCallback, Object) 메서드
정의
중요
일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.
서브클래스에서 재정의될 때, 인터넷 리소스에 대한 비동기 요청을 시작합니다.
public:
abstract IAsyncResult ^ BeginGetResponse(AsyncCallback ^ callback, System::Object ^ state);public:
virtual IAsyncResult ^ BeginGetResponse(AsyncCallback ^ callback, System::Object ^ state);public abstract IAsyncResult BeginGetResponse (AsyncCallback callback, object state);public virtual IAsyncResult BeginGetResponse (AsyncCallback? callback, object? state);public virtual IAsyncResult BeginGetResponse (AsyncCallback callback, object state);abstract member BeginGetResponse : AsyncCallback * obj -> IAsyncResultabstract member BeginGetResponse : AsyncCallback * obj -> IAsyncResult
override this.BeginGetResponse : AsyncCallback * obj -> IAsyncResultPublic MustOverride Function BeginGetResponse (callback As AsyncCallback, state As Object) As IAsyncResultPublic Overridable Function BeginGetResponse (callback As AsyncCallback, state As Object) As IAsyncResult매개 변수
- callback
- AsyncCallback
AsyncCallback 대리자입니다.
- state
- Object
이 비동기 요청에 대한 상태 정보가 들어 있는 개체입니다.
반환
비동기 요청을 참조하는 IAsyncResult입니다.
예외
메서드가 서브클래스에서 재정의되지 않았는데 메서드에 액세스하려 할 경우
예제
다음 예제에서는 를 사용하여 BeginGetResponse 대상 리소스를 비동기적으로 요청합니다. 리소스를 가져오면 지정된 콜백 메서드가 실행됩니다.
#using <System.dll>
using namespace System;
using namespace System::Net;
using namespace System::IO;
using namespace System::Text;
using namespace System::Threading;
public ref class RequestState
{
private:
// This class stores the state of the request.
literal int BUFFER_SIZE = 1024;
public:
StringBuilder^ requestData;
array<Byte>^bufferRead;
WebRequest^ request;
WebResponse^ response;
Stream^ responseStream;
RequestState()
{
bufferRead = gcnew array<Byte>(BUFFER_SIZE);
requestData = gcnew StringBuilder( "" );
request = nullptr;
responseStream = nullptr;
}
};
ref class WebRequest_BeginGetResponse
{
public:
static ManualResetEvent^ allDone = gcnew ManualResetEvent( false );
literal int BUFFER_SIZE = 1024;
static void RespCallback( IAsyncResult^ asynchronousResult )
{
try
{
// Set the State of request to asynchronous.
RequestState^ myRequestState = dynamic_cast<RequestState^>(asynchronousResult->AsyncState);
WebRequest^ myWebRequest1 = myRequestState->request;
// End the Asynchronous response.
myRequestState->response = myWebRequest1->EndGetResponse( asynchronousResult );
// Read the response into a 'Stream' object.
Stream^ responseStream = myRequestState->response->GetResponseStream();
myRequestState->responseStream = responseStream;
// Begin the reading of the contents of the HTML page and print it to the console.
IAsyncResult^ asynchronousResultRead = responseStream->BeginRead( myRequestState->bufferRead, 0, BUFFER_SIZE, gcnew AsyncCallback( ReadCallBack ), myRequestState );
}
catch ( WebException^ e )
{
Console::WriteLine( "WebException raised!" );
Console::WriteLine( "\n {0}", e->Message );
Console::WriteLine( "\n {0}", e->Status );
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception raised!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
}
static void ReadCallBack( IAsyncResult^ asyncResult )
{
try
{
// Result state is set to AsyncState.
RequestState^ myRequestState = dynamic_cast<RequestState^>(asyncResult->AsyncState);
Stream^ responseStream = myRequestState->responseStream;
int read = responseStream->EndRead( asyncResult );
// Read the contents of the HTML page and then print to the console.
if ( read > 0 )
{
myRequestState->requestData->Append( Encoding::ASCII->GetString( myRequestState->bufferRead, 0, read ) );
IAsyncResult^ asynchronousResult = responseStream->BeginRead( myRequestState->bufferRead, 0, BUFFER_SIZE, gcnew AsyncCallback( ReadCallBack ), myRequestState );
}
else
{
Console::WriteLine( "\nThe HTML page Contents are: " );
if ( myRequestState->requestData->Length > 1 )
{
String^ sringContent;
sringContent = myRequestState->requestData->ToString();
Console::WriteLine( sringContent );
}
Console::WriteLine( "\nPress 'Enter' key to continue........" );
responseStream->Close();
allDone->Set();
}
}
catch ( WebException^ e )
{
Console::WriteLine( "WebException raised!" );
Console::WriteLine( "\n {0}", e->Message );
Console::WriteLine( "\n {0}", e->Status );
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception raised!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
}
};
int main()
{
try
{
// Create a new webrequest to the mentioned URL.
WebRequest^ myWebRequest = WebRequest::Create( "http://www.contoso.com" );
// Please, set the proxy to a correct value.
WebProxy^ proxy = gcnew WebProxy( "myproxy:80" );
proxy->Credentials = gcnew NetworkCredential( "srikun","simrin123" );
myWebRequest->Proxy = proxy;
// Create a new instance of the RequestState.
RequestState^ myRequestState = gcnew RequestState;
// The 'WebRequest' object is associated to the 'RequestState' object.
myRequestState->request = myWebRequest;
// Start the Asynchronous call for response.
IAsyncResult^ asyncResult = dynamic_cast<IAsyncResult^>(myWebRequest->BeginGetResponse( gcnew AsyncCallback( WebRequest_BeginGetResponse::RespCallback ), myRequestState ));
WebRequest_BeginGetResponse::allDone->WaitOne();
// Release the WebResponse resource.
myRequestState->response->Close();
Console::Read();
}
catch ( WebException^ e )
{
Console::WriteLine( "WebException raised!" );
Console::WriteLine( "\n {0}", e->Message );
Console::WriteLine( "\n {0}", e->Status );
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception raised!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
}
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Threading;
public class RequestState
{
// This class stores the state of the request.
const int BUFFER_SIZE = 1024;
public StringBuilder requestData;
public byte[] bufferRead;
public WebRequest request;
public WebResponse response;
public Stream responseStream;
public RequestState()
{
bufferRead = new byte[BUFFER_SIZE];
requestData = new StringBuilder("");
request = null;
responseStream = null;
}
}
class WebRequest_BeginGetResponse
{
public static ManualResetEvent allDone= new ManualResetEvent(false);
const int BUFFER_SIZE = 1024;
static void Main()
{
try
{
// Create a new webrequest to the mentioned URL.
WebRequest myWebRequest= WebRequest.Create("http://www.contoso.com");
// Please, set the proxy to a correct value.
WebProxy proxy=new WebProxy("myproxy:80");
proxy.Credentials=new NetworkCredential("srikun","simrin123");
myWebRequest.Proxy=proxy;
// Create a new instance of the RequestState.
RequestState myRequestState = new RequestState();
// The 'WebRequest' object is associated to the 'RequestState' object.
myRequestState.request = myWebRequest;
// Start the Asynchronous call for response.
IAsyncResult asyncResult=(IAsyncResult) myWebRequest.BeginGetResponse(new AsyncCallback(RespCallback),myRequestState);
allDone.WaitOne();
// Release the WebResponse resource.
myRequestState.response.Close();
Console.Read();
}
catch(WebException e)
{
Console.WriteLine("WebException raised!");
Console.WriteLine("\n{0}",e.Message);
Console.WriteLine("\n{0}",e.Status);
}
catch(Exception e)
{
Console.WriteLine("Exception raised!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
}
}
private static void RespCallback(IAsyncResult asynchronousResult)
{
try
{
// Set the State of request to asynchronous.
RequestState myRequestState=(RequestState) asynchronousResult.AsyncState;
WebRequest myWebRequest1=myRequestState.request;
// End the Asynchronous response.
myRequestState.response = myWebRequest1.EndGetResponse(asynchronousResult);
// Read the response into a 'Stream' object.
Stream responseStream = myRequestState.response.GetResponseStream();
myRequestState.responseStream=responseStream;
// Begin the reading of the contents of the HTML page and print it to the console.
IAsyncResult asynchronousResultRead = responseStream.BeginRead(myRequestState.bufferRead, 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), myRequestState);
}
catch(WebException e)
{
Console.WriteLine("WebException raised!");
Console.WriteLine("\n{0}",e.Message);
Console.WriteLine("\n{0}",e.Status);
}
catch(Exception e)
{
Console.WriteLine("Exception raised!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
}
}
private static void ReadCallBack(IAsyncResult asyncResult)
{
try
{
// Result state is set to AsyncState.
RequestState myRequestState = (RequestState)asyncResult.AsyncState;
Stream responseStream = myRequestState.responseStream;
int read = responseStream.EndRead( asyncResult );
// Read the contents of the HTML page and then print to the console.
if (read > 0)
{
myRequestState.requestData.Append(Encoding.ASCII.GetString(myRequestState.bufferRead, 0, read));
IAsyncResult asynchronousResult = responseStream.BeginRead( myRequestState.bufferRead, 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), myRequestState);
}
else
{
Console.WriteLine("\nThe HTML page Contents are: ");
if(myRequestState.requestData.Length>1)
{
string sringContent;
sringContent = myRequestState.requestData.ToString();
Console.WriteLine(sringContent);
}
Console.WriteLine("\nPress 'Enter' key to continue........");
responseStream.Close();
allDone.Set();
}
}
catch(WebException e)
{
Console.WriteLine("WebException raised!");
Console.WriteLine("\n{0}",e.Message);
Console.WriteLine("\n{0}",e.Status);
}
catch(Exception e)
{
Console.WriteLine("Exception raised!");
Console.WriteLine("Source : {0}" , e.Source);
Console.WriteLine("Message : {0}" , e.Message);
}
}
}
Imports System.Net
Imports System.IO
Imports System.Text
Imports System.Threading
Public Class RequestState
' This class stores the state of the request
Private Shared BUFFER_SIZE As Integer = 1024
Public requestData As StringBuilder
Public bufferRead() As Byte
Public request As WebRequest
Public response As WebResponse
Public responseStream As Stream
Public Sub New()
bufferRead = New Byte(BUFFER_SIZE) {}
requestData = New StringBuilder("")
request = Nothing
responseStream = Nothing
End Sub
End Class
Class WebRequest_BeginGetResponse
Public Shared allDone As New ManualResetEvent(False)
Private Shared BUFFER_SIZE As Integer = 1024
Shared Sub Main()
Try
' Create a new webrequest to the mentioned URL.
Dim myWebRequest As WebRequest = WebRequest.Create("http://www.contoso.com")
'Please, set the proxy to a correct value.
Dim proxy As New WebProxy("itgproxy:80")
proxy.Credentials = New NetworkCredential("srikun", "simrin123")
myWebRequest.Proxy = proxy
' Create a new instance of the RequestState.
Dim myRequestState As New RequestState()
' The 'WebRequest' object is associated to the 'RequestState' object.
myRequestState.request = myWebRequest
' Start the Asynchronous call for response.
Dim asyncResult As IAsyncResult = CType(myWebRequest.BeginGetResponse(AddressOf RespCallback, myRequestState), IAsyncResult)
allDone.WaitOne()
' Release the WebResponse resource.
myRequestState.response.Close()
Console.Read()
Catch e As WebException
Console.WriteLine("WebException raised!")
Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
Catch e As Exception
Console.WriteLine("Exception raised!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
End Try
End Sub
Private Shared Sub RespCallback(asynchronousResult As IAsyncResult)
Try
' Set the State of request to asynchronous.
Dim myRequestState As RequestState = CType(asynchronousResult.AsyncState, RequestState)
Dim myWebRequest1 As WebRequest = myRequestState.request
' End the Asynchronous response.
myRequestState.response = myWebRequest1.EndGetResponse(asynchronousResult)
' Read the response into a 'Stream' object.
Dim responseStream As Stream = myRequestState.response.GetResponseStream()
myRequestState.responseStream = responseStream
' Begin the reading of the contents of the HTML page and print it to the console.
Dim asynchronousResultRead As IAsyncResult = responseStream.BeginRead(myRequestState.bufferRead, 0, BUFFER_SIZE, AddressOf ReadCallBack, myRequestState)
Catch e As WebException
Console.WriteLine("WebException raised!")
Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
Catch e As Exception
Console.WriteLine("Exception raised!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
End Try
End Sub
Private Shared Sub ReadCallBack(asyncResult As IAsyncResult)
Try
' Result state is set to AsyncState.
Dim myRequestState As RequestState = CType(asyncResult.AsyncState, RequestState)
Dim responseStream As Stream = myRequestState.responseStream
Dim read As Integer = responseStream.EndRead(asyncResult)
' Read the contents of the HTML page and then print to the console.
If read > 0 Then
myRequestState.requestData.Append(Encoding.ASCII.GetString(myRequestState.bufferRead, 0, read))
Dim asynchronousResult As IAsyncResult = responseStream.BeginRead(myRequestState.bufferRead, 0, BUFFER_SIZE, AddressOf ReadCallBack, myRequestState)
Else
Console.WriteLine(ControlChars.Cr + "The HTML page Contents are: ")
If myRequestState.requestData.Length > 1 Then
Dim sringContent As String
sringContent = myRequestState.requestData.ToString()
Console.WriteLine(sringContent)
End If
Console.WriteLine(ControlChars.Cr + "Press 'Enter' key to continue........")
responseStream.Close()
allDone.Set()
End If
Catch e As WebException
Console.WriteLine("WebException raised!")
Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
Catch e As Exception
Console.WriteLine("Exception raised!")
Console.WriteLine("Source :{0} ", e.Source)
Console.WriteLine("Message :{0} ", e.Message)
End Try
End Sub
End Class
설명
메서드는 BeginGetResponse 응답에 대한 비동기 요청을 시작합니다. 대리자를 AsyncCallback 구현하는 콜백 메서드는 메서드를 EndGetResponse 사용하여 인터넷 리소스에서 를 WebResponse 반환합니다.
참고
클래스는 WebRequest 클래스입니다 abstract . 런타임에 인스턴스의 WebRequest 실제 동작은 메서드에서 반환된 하위 클래스에 WebRequest.Create 의해 결정됩니다. 기본값 및 예외에 대한 자세한 내용은 및 FileWebRequest와 같은 HttpWebRequest 하위 클래스에 대한 설명서를 참조하세요.
적용 대상
추가 정보
GitHub에서 Microsoft와 공동 작업
이 콘텐츠의 원본은 GitHub에서 찾을 수 있으며, 여기서 문제와 끌어오기 요청을 만들고 검토할 수도 있습니다. 자세한 내용은 참여자 가이드를 참조하세요.
.NET
피드백
출시 예정: 2024년 내내 콘텐츠에 대한 피드백 메커니즘으로 GitHub 문제를 단계적으로 폐지하고 이를 새로운 피드백 시스템으로 바꿀 예정입니다. 자세한 내용은 다음을 참조하세요. https://aka.ms/ContentUserFeedback
다음에 대한 사용자 의견 제출 및 보기