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WebException Constructor (String, Exception, WebExceptionStatus, WebResponse)

Initializes a new instance of the WebException class with the specified error message, nested exception, status, and response.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Sub New ( _
	message As String, _
	innerException As Exception, _
	status As WebExceptionStatus, _
	response As WebResponse _
)
'Usage
Dim message As String 
Dim innerException As Exception 
Dim status As WebExceptionStatus 
Dim response As WebResponse 

Dim instance As New WebException(message, _
	innerException, status, response)

Parameters

message
Type: System.String

The text of the error message.

innerException
Type: System.Exception

A nested exception.

status
Type: System.Net.WebExceptionStatus

One of the WebExceptionStatus values.

response
Type: System.Net.WebResponse

A WebResponse instance that contains the response from the remote host.

The WebException instance is initialized with the Message property set to the value of message, the InnerException property set to the value of innerException, the Status property set to the value of status, and the Response property set to the value of response. If message is Nothing, the Message property is initialized to a system-supplied message.

The following example throws a WebException by specifying an error message and a WebExceptionStatus.


	  ' Send the data.  
     Dim ASCII As Encoding = Encoding.ASCII
     Dim requestPage As String = "GET /nhjj.htm HTTP/1.1" + ControlChars.Lf + ControlChars.Cr + "Host: " + connectUri + ControlChars.Lf + ControlChars.Cr + "Connection: Close" + ControlChars.Lf + ControlChars.Cr + ControlChars.Lf + ControlChars.Cr
     Dim byteGet As [Byte]() = ASCII.GetBytes(requestPage)
     Dim recvBytes(256) As [Byte]

     ' Create an 'IPEndPoint' object. 
     Dim hostEntry As IPHostEntry = Dns.Resolve(connectUri)
     Dim serverAddress As IPAddress = hostEntry.AddressList(0)
     Dim endPoint As New IPEndPoint(serverAddress, 80)

     ' Create a 'Socket' object  for sending data. 
     Dim connectSocket As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)

     ' Connect to host using 'IPEndPoint' object.
     connectSocket.Connect(endPoint)

     ' Sent the 'requestPage' text to the host.
     connectSocket.Send(byteGet, byteGet.Length, 0)

     ' Receive the information sent by the server. 
     Dim bytesReceived As Int32 = connectSocket.Receive(recvBytes, recvBytes.Length, 0)
     Dim headerString As [String] = ASCII.GetString(recvBytes, 0, bytesReceived)

     ' Check whether 'status 404' is there or not in the information sent by server. 
     If headerString.IndexOf("404") <> False Then
         bytesReceived = connectSocket.Receive(recvBytes, recvBytes.Length, 0)
         Dim memoryStream As New MemoryStream(recvBytes)
         getStream = CType(memoryStream, Stream)

         ' Create a 'WebResponse' object. 
         Dim myWebResponse As WebResponse = CType(New HttpConnect(getStream), WebResponse)
         Dim myException As New Exception("File Not found")

         ' Throw the 'WebException' object with a message string, message status,InnerException and WebResponse. 
         Throw New WebException("The Requested page is not found.", myException, WebExceptionStatus.ProtocolError, myWebResponse)
     End If 

     connectSocket.Close()
      // Send the data.
      Encoding*  ASCII = Encoding::ASCII;
      String* requestPage = String::Concat(S"GET /nhjj.htm HTTP/1.1\r\nHost: ", connectUri, S"\r\nConnection: Close\r\n\r\n");
      Byte byteGet[] = ASCII->GetBytes(requestPage);
      Byte recvBytes[] = new Byte[256];

      // Create an 'IPEndPoint' object.
      IPHostEntry* hostEntry = Dns::Resolve(connectUri);
      IPAddress* serverAddress = hostEntry->AddressList[0];
      IPEndPoint* endPoint = new IPEndPoint(serverAddress, 80);

      // Create a 'Socket' object  for sending data.
      Socket* connectSocket = new Socket(AddressFamily::InterNetwork, SocketType::Stream, ProtocolType::Tcp);

      // Connect to host using 'IPEndPoint' object.
      connectSocket->Connect(endPoint);

      // Sent the 'requestPage' text to the host.
      connectSocket->Send(byteGet, byteGet->Length,static_cast<SocketFlags>(0));

      // Receive the information sent by the server.
      Int32 bytesReceived = connectSocket->Receive(recvBytes, recvBytes->Length,static_cast<SocketFlags>(0));
      String* headerString = ASCII->GetString(recvBytes, 0, bytesReceived);

      // Check whether 'status 404' is there or not in the information sent by server.
      if (headerString->IndexOf(S"404")!=-1) {
         bytesReceived = connectSocket->Receive(recvBytes, recvBytes->Length,static_cast<SocketFlags>(0));
         MemoryStream* memoryStream = new MemoryStream(recvBytes);
		 getStream = dynamic_cast<System::IO::Stream*>(memoryStream);

         // Create a 'WebResponse' object
         WebResponse * myWebResponse = dynamic_cast<WebResponse*>(new HttpConnect(getStream));
         Exception* myException = new Exception(S"File Not found");

         // Throw the 'WebException' object with a message string, message status, InnerException and WebResponse
         throw new WebException(S"The Requested page is not found.",
            myException, WebExceptionStatus::ProtocolError, myWebResponse);
      }

      connectSocket->Close();

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0
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