HttpWebRequest.HaveResponse プロパティ

.NET Framework クラス ライブラリ リファレンス

HttpWebRequest.HaveResponse プロパティ

インターネット リソースから応答が受信されたかどうかを示す値を取得します。

名前空間: System.Net
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public ReadOnly Property
 HaveResponse As Boolean

Visual Basic (使用法)

Dim instance As HttpWebRequest
Dim value As Boolean

value = instance.HaveResponse

C#

public bool HaveResponse { get;
 }

C++

public:
property bool HaveResponse {
    bool get ();
}

J#

/** @property */
public boolean get_HaveResponse ()

JScript

public function get HaveResponse
 () : boolean

プロパティ値
応答を受信した場合は true。それ以外の場合は false。

使用例

HaveResponse プロパティをチェックして、インターネット リソースから応答を受信したかどうかを確認するコード例を次に示します。

Visual Basic

' Create a new 'HttpWebRequest' Object.
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.contoso.com"),
 HttpWebRequest)
Dim myHttpWebResponse As HttpWebResponse
' Display the 'HaveResponse' property of the 'HttpWebRequest' object
 to the console.
Console.WriteLine(ControlChars.Cr + "The value of 'HaveResponse'
 property before a response object is obtained :{0}", myHttpWebRequest.HaveResponse)
' Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse'
 variable.
myHttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
If myHttpWebRequest.HaveResponse Then
    Dim streamResponse As Stream = myHttpWebResponse.GetResponseStream()
    Dim streamRead As New
 StreamReader(streamResponse)
    Dim readBuff(256) As [Char]
    Dim count As Integer
 = streamRead.Read(readBuff, 0, 256)
    Console.WriteLine(ControlChars.Cr + "The contents of Html
 Page are :  " + ControlChars.Cr)
    While count > 0
        Dim outputData As New
 [String](readBuff, 0, count)
        Console.Write(outputData)
        count = streamRead.Read(readBuff, 0, 256)
    End While
      '  Close the Stream object.
      streamResponse.Close()
      streamRead.Close()
      ' Release the HttpWebResponse Resource.
      myHttpWebResponse.Close()
    Console.WriteLine(ControlChars.Cr + "Press 'Enter' key to continue..........")
    Console.Read()

Else
    Console.WriteLine(ControlChars.Cr + "The response is not received
 ")
End If

C#

// Create a new 'HttpWebRequest' Object.
HttpWebRequest myHttpWebRequest=(HttpWebRequest)WebRequest.Create("http://www.contoso.com");
HttpWebResponse myHttpWebResponse;
// Display the 'HaveResponse' property of the 'HttpWebRequest' object
 to the console.
Console.WriteLine("\nThe value of 'HaveResponse' property before a response
 object is obtained :{0}",myHttpWebRequest.HaveResponse);
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse'
 variable.
myHttpWebResponse=(HttpWebResponse)myHttpWebRequest.GetResponse();
if (myHttpWebRequest.HaveResponse)
{
    Stream streamResponse=myHttpWebResponse.GetResponseStream();
    StreamReader streamRead = new StreamReader( streamResponse
 );
    Char[] readBuff = new Char[256];
    int count = streamRead.Read( readBuff, 0, 256 );
    Console.WriteLine("\nThe contents of Html Page are :  \n");    
    while (count > 0) 
    {
        String outputData = new String(readBuff, 0, count);
        Console.Write(outputData);
        count = streamRead.Read(readBuff, 0, 256);
    }
    // Close the Stream object.
    streamResponse.Close();
    streamRead.Close();
    // Release the HttpWebResponse Resource.
    myHttpWebResponse.Close();
    Console.WriteLine("\nPress 'Enter' key to continue..........");
    Console.Read();
}
else
{
    Console.WriteLine("\nThe response is not received ");
}

C++

      // Create a new 'HttpWebRequest' Object.
      HttpWebRequest^ myHttpWebRequest = dynamic_cast<HttpWebRequest^>(WebRequest::Create(
 "http://www.contoso.com" ));
      HttpWebResponse^ myHttpWebResponse;
      
      // Display the 'HaveResponse' property of the 'HttpWebRequest' object
 to the console.
      Console::WriteLine( "\nThe value of 'HaveResponse' property before a response
 object is obtained : {0}", myHttpWebRequest->HaveResponse );
      
      // Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse'
 variable.
      myHttpWebResponse = dynamic_cast<HttpWebResponse^>(myHttpWebRequest->GetResponse());
      if ( myHttpWebRequest->HaveResponse )
      {
         Stream^ streamResponse = myHttpWebResponse->GetResponseStream();
         StreamReader^ streamRead = gcnew StreamReader( streamResponse );
         array<Char>^readBuff = gcnew array<Char>(256);
         int count = streamRead->Read( readBuff, 0, 256 );
         Console::WriteLine( "\nThe contents of Html Page are :  \n" );
         while ( count > 0 )
         {
            String^ outputData = gcnew String( readBuff,0,count );
            Console::Write( outputData );
            count = streamRead->Read( readBuff, 0, 256 );
         }
         streamResponse->Close();
         streamRead->Close();
         
         // Release the HttpWebResponse Resource.
         myHttpWebResponse->Close();
         Console::WriteLine( "\nPress 'Enter' key to continue.........."
 );
         Console::Read();
      }
      else
      {
         Console::WriteLine( "\nThe response is not received " );
      }
   }
   catch ( WebException^ e ) 
   {
      Console::WriteLine( "\nWebException Caught" );
      Console::WriteLine( "\nSource  : {0}", e->Source );
      Console::WriteLine( "\nMessage : {0}", e->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception Caught" );
      Console::WriteLine( "Source  : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }

}

J#

// Create a new 'HttpWebRequest' Object.
HttpWebRequest myHttpWebRequest = (HttpWebRequest)
    (WebRequest.Create("http://www.contoso.com"));
HttpWebResponse myHttpWebResponse;
// Display the 'HaveResponse' property of the 'HttpWebRequest' 
// object to the console.
Console.WriteLine("\nThe value of 'HaveResponse' property before a"
    +" response object is obtained :{0}", 
    System.Convert.ToString(myHttpWebRequest.get_HaveResponse()));
// Assign the response object of 'HttpWebRequest' to a
//'HttpWebResponse' variable.
myHttpWebResponse = (HttpWebResponse)
    (myHttpWebRequest.GetResponse());

if (myHttpWebRequest.get_HaveResponse()) {
    Stream streamResponse = myHttpWebResponse.GetResponseStream();
    StreamReader streamRead = new StreamReader(streamResponse);
    char readBuff[] = new char[256];
    int count = streamRead.Read(readBuff, 0, 256);

    Console.WriteLine("\nThe contents of Html Page are :  \n");

    while (count > 0) {
        String outputData = new String(readBuff, 0, count);
        Console.Write(outputData);
        count = streamRead.Read(readBuff, 0, 256);
    }

    // Close the Stream object.
    streamResponse.Close();
    streamRead.Close();
    // Release the HttpWebResponse Resource.
    myHttpWebResponse.Close();
    Console.WriteLine("\nPress 'Enter' key to continue..........");
    Console.Read();
}
else {
    Console.WriteLine("\nThe response is not received ");
}

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
HttpWebRequest クラス
HttpWebRequest メンバ
System.Net 名前空間