WebException.Response 属性

定义

命名空间:

System.Net

程序集:

System.Net.Requests.dll

Source:

WebException.cs

获取远程主机返回的响应。

public:
 property System::Net::WebResponse ^ Response { System::Net::WebResponse ^ get(); };

public System.Net.WebResponse? Response { get; }

member this.Response : System.Net.WebResponse

Public ReadOnly Property Response As WebResponse

属性值

WebResponse

如果可从 Internet 资源获得响应，则为包含来自 Internet 资源的错误响应的 WebResponse 实例；否则为 null。

示例

下面的示例检查 属性，Status并将 基础HttpWebResponse实例的 和 StatusDescription 输出到控制台StatusCode。

try
{
   // Create a web request for an unknown server (this raises the WebException).
   HttpWebRequest^ myHttpWebRequest = (HttpWebRequest^)(WebRequest::Create( "http://unknown.unknown.com" ));
   
   // Get the associated response for the above request.
   HttpWebResponse^ myHttpWebResponse = (HttpWebResponse^)(myHttpWebRequest->GetResponse());
   myHttpWebResponse->Close();
}
catch ( WebException^ e ) 
{
   Console::WriteLine( "This program is expected to throw WebException on successful run." +
      "\n\nException Message : " + e->Message );
   if ( e->Status == WebExceptionStatus::ProtocolError )
   {
      Console::WriteLine( "Status Code: {0}", ( (HttpWebResponse^)(e->Response) )->StatusCode );
      Console::WriteLine( "Status Description: {0}", ( (HttpWebResponse^)(e->Response) )->StatusDescription );
   }
}
catch ( Exception^ e ) 
{
   Console::WriteLine( e->Message );
}

try {
   // Create a web request for an invalid site. Substitute the "invalid site" strong in the Create call with a invalid name.
     HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("invalid site");

    // Get the associated response for the above request.
     HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();
    myHttpWebResponse.Close();
}
catch(WebException e) {
    Console.WriteLine("This program is expected to throw WebException on successful run."+
                        "\n\nException Message :" + e.Message);
    if(e.Status == WebExceptionStatus.ProtocolError) {
        Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
        Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
    }
}
catch(Exception e) {
    Console.WriteLine(e.Message);
}

 Try
     'Create a web request for an invalid site. Substitute the "invalid site" strong in the Create call with a invalid name.
     Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("invalid site"), HttpWebRequest)
     
     'Get the associated response for the above request.
     Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
     myHttpWebResponse.Close()
 Catch e As WebException
     Console.WriteLine(e.Message)
     
      If e.Status = WebExceptionStatus.ProtocolError Then
         Console.WriteLine("Status Code : {0}", CType(e.Response, HttpWebResponse).StatusCode)
         Console.WriteLine("Status Description : {0}", CType(e.Response, HttpWebResponse).StatusDescription)
     End If

Catch e As Exception
     Console.WriteLine(e.Message)
 End Try

注解

某些 Internet 协议（如 HTTP）返回有效的响应，指示在协议级别发生了错误。 当对 Internet 请求的响应指示错误时，WebRequest.GetResponse将 属性设置为 WebExceptionStatus.ProtocolError ，并提供WebResponse在引发的 的 WebException 属性中包含Response错误消息Status的 。 应用程序可以检查 WebResponse 以确定实际错误。