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。

Public ReadOnly Property HaveResponse As Boolean
[C#]
public bool HaveResponse {get;}
[C++]
public: __property bool 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

[Visual Basic, C#, C++] HaveResponse プロパティを調べて、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例を次に示します。

 
' Create a new 'HttpWebRequest' Object.
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("https://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("https://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(S"https://www.contoso.com"));
HttpWebResponse* myHttpWebResponse;
// Display the 'HaveResponse' property of the 'HttpWebRequest' object to the console.
Console::WriteLine(S"\nThe value of 'HaveResponse' property before a response object is obtained : {0}",
   __box(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 = new StreamReader(streamResponse);
   Char readBuff[] = new Char[256];
   int count = streamRead->Read(readBuff, 0, 256);
   Console::WriteLine(S"\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(S"\nPress 'Enter' key to continue..........");
   Console::Read();
} else {
   Console::WriteLine(S"\nThe response is not received ");
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET, Common Language Infrastructure (CLI) Standard

参照

HttpWebRequest クラス | HttpWebRequest メンバ | System.Net 名前空間