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WebRequest.Proxy Property

When overridden in a descendant class, gets or sets the network proxy to use to access this Internet resource.

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

'Declaration
Public Overridable Property Proxy As IWebProxy
'Usage
Dim instance As WebRequest
Dim value As IWebProxy

value = instance.Proxy

instance.Proxy = value
/** @property */
public IWebProxy get_Proxy ()

/** @property */
public void set_Proxy (IWebProxy value)

public function get Proxy () : IWebProxy

public function set Proxy (value : IWebProxy)

Not applicable.

Property Value

The IWebProxy to use to access the Internet resource.

Exception typeCondition

NotImplementedException

Any attempt is made to get or set the property, when the property is not overridden in a descendant class.

The Proxy property identifies the network proxy that the request uses to access the Internet resource. The request is made through the proxy server rather than directly to the Internet resource.

NoteNote:

The WebRequest class is an abstract class. The actual behavior of WebRequest instances at run time is determined by the descendant class returned by the WebRequest.Create method. For more information about default values and exceptions, see the documentation for the descendant classes, such as HttpWebRequest and FileWebRequest.

The following example displays the current network proxy address and allows the user to assign a new network proxy address and port number.


  ' Create a new request to the mentioned URL.                
  Dim myWebRequest As WebRequest = WebRequest.Create("http://www.contoso.com")
  Dim myProxy As New WebProxy()

  ' Obtain the Proxy Prperty of the  Default browser. 
   myProxy = CType(myWebRequest.Proxy, WebProxy)

  ' Print myProxy address to the console.
  Console.WriteLine(ControlChars.Cr + "The actual default Proxy settings are {0}", myProxy.Address)

  Try
      Console.WriteLine(ControlChars.Cr + "Please enter the new Proxy Address to be set ")
      Console.WriteLine("The format of the address should be http://proxyUriAddress:portaddress")
      Console.WriteLine("Example:http://moon.proxy.com:8080")
      Dim proxyAddress As String
      proxyAddress = Console.ReadLine()

      If proxyAddress.Length = 0 Then
          myWebRequest.Proxy = myProxy
      Else
          Console.WriteLine(ControlChars.Cr + "Please enter the Credentials")
          Console.WriteLine("Username:")
          Dim username As String
          username = Console.ReadLine()
          Console.WriteLine(ControlChars.Cr + "Password:")
          Dim password As String
          password = Console.ReadLine()

         ' Create a new Uri object.
          Dim newUri As New Uri(proxyAddress)

          ' Associate the new Uri object to the myProxy object.
          myProxy.Address = newUri

          ' Create a NetworkCredential object and is assign to the Credentials property of the Proxy object.
          myProxy.Credentials = New NetworkCredential(username, password)
          myWebRequest.Proxy = myProxy
          
      End If
      Console.WriteLine(ControlChars.Cr + "The Address of the  new Proxy settings are {0}", myProxy.Address)
      Dim myWebResponse As WebResponse = myWebRequest.GetResponse()

      ' Print the  HTML contents of the page to the console.
      Dim streamResponse As Stream = myWebResponse.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 the Html pages are :")

      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.
  myWebResponse.Close()
      Console.WriteLine(ControlChars.Cr + "Press any key to continue.........")
      Console.Read()
  Catch e As UriFormatException
      Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
      Console.WriteLine(ControlChars.Cr + "The format of the myProxy address you entered is invalid")
   End Try
   

// Create a new request to the mentioned URL.                
WebRequest myWebRequest = WebRequest.Create("http://www.contoso.com");

WebProxy myProxy = new WebProxy();
// Obtain the Proxy Prperty of the  Default browser.  
myProxy = (WebProxy)myWebRequest.get_Proxy();
// Print myProxy address to the console.
Console.WriteLine("\nThe actual default Proxy settings are {0}",
    myProxy.get_Address());
try {
    Console.WriteLine("\nPlease enter the new Proxy Address to" 
        + " be set ");
    Console.WriteLine("The format of the address should be" 
        + " http://proxyUriAddress:portaddress");
    Console.WriteLine("Example:http://proxyadress.com:8080");
    String proxyAddress;
    proxyAddress = Console.ReadLine();

    if (proxyAddress.get_Length() == 0) {
        myWebRequest.set_Proxy(myProxy);
    }
    else {
        Console.WriteLine("\nPlease enter the Credentials");
        Console.WriteLine("Username:");
        String userName;
        userName = Console.ReadLine();
        Console.WriteLine("\nPassword:");
        String password;
        password = Console.ReadLine();
        // Create a new Uri object.
        Uri newUri = new Uri(proxyAddress);
        // Associate the new Uri object to the myProxy object.
        myProxy.set_Address(newUri);
        // Create a NetworkCredential object and is assign to the 
        // Credentials property of the Proxy object.
        myProxy.set_Credentials(new NetworkCredential(userName,
            password));
        myWebRequest.set_Proxy(myProxy);
    }
    Console.WriteLine("\nThe Address of the  new Proxy settings" 
        + " are {0}", myProxy.get_Address());
    WebResponse myWebResponse = myWebRequest.GetResponse();
    // Print the  HTML contents of the page to the console.
    Stream streamResponse = myWebResponse.GetResponseStream();
    StreamReader streamRead = new StreamReader(streamResponse);
    char readBuff[] = new char[256];
    int count = streamRead.Read(readBuff, 0, 256);
    Console.WriteLine("\nThe contents of the Html pages are :");
    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.
    myWebResponse.Close();
    Console.WriteLine("\nPress any key to continue.........");
    Console.Read();
}
catch (UriFormatException e) {
    Console.WriteLine("\nUriFormatException is thrown.Message" 
        + " is {0}", e.get_Message());
    Console.WriteLine("\nThe format of the myProxy address you" 
        + " entered is invalid");
    Console.WriteLine("\nPress any key to continue.........");
    Console.Read();
}

Windows 98, Windows Server 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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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