WebRequest.Proxy Właściwość

Definicja

Gdy jest zastępowany w klasie podrzędnej, Pobiera lub ustawia serwer proxy sieci do użycia w celu uzyskania dostępu do tego zasobu internetowego.When overridden in a descendant class, gets or sets the network proxy to use to access this Internet resource.

public:
 virtual property System::Net::IWebProxy ^ Proxy { System::Net::IWebProxy ^ get(); void set(System::Net::IWebProxy ^ value); };
public virtual System.Net.IWebProxy Proxy { get; set; }
member this.Proxy : System.Net.IWebProxy with get, set
Public Overridable Property Proxy As IWebProxy

Wartość właściwości

IWebProxy

IWebProxy do użycia w celu uzyskania dostępu do zasobu internetowego.The IWebProxy to use to access the Internet resource.

Wyjątki

Podejmowana jest jakakolwiek próba pobrania lub ustawienia właściwości, gdy właściwość nie zostanie zastąpiona w klasie podrzędnej.Any attempt is made to get or set the property, when the property is not overridden in a descendant class.

Przykłady

Poniższy przykład wyświetla bieżący sieciowy adres serwera proxy i zezwala użytkownikowi na przypisanie nowego adresu serwera proxy sieci i numeru portu.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.
WebRequest^ myWebRequest = WebRequest::Create( "http://www.contoso.com" );

WebProxy^ myProxy = gcnew WebProxy;
// Obtain the Proxy Prperty of the  Default browser.
myProxy = (WebProxy^)(myWebRequest->Proxy);

// Print myProxy address to the console.
Console::WriteLine( "\nThe actual default Proxy settings are {0}", myProxy->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->Length == 0 )
   {
      myWebRequest->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 = gcnew 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 = gcnew NetworkCredential( username,password );
      myWebRequest->Proxy = myProxy;
   }
   Console::WriteLine( "\nThe Address of the  new Proxy settings are {0}", myProxy->Address );
   WebResponse^ myWebResponse = myWebRequest->GetResponse();
   
   // Print the  HTML contents of the page to the console.
   Stream^ streamResponse = myWebResponse->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 the Html pages are :" );
   while ( count > 0 )
   {
      String^ outputData = gcnew 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->Message );
   Console::WriteLine( "\nThe format of the myProxy address you entered is invalid" );
   Console::WriteLine( "\nPress any key to continue........." );
   Console::Read();
}
   // 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.Proxy;

   // Print myProxy address to the console.
   Console.WriteLine("\nThe actual default Proxy settings are {0}",myProxy.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.Length==0)
       {
           myWebRequest.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.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;
       }
       Console.WriteLine("\nThe Address of the  new Proxy settings are {0}",myProxy.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.Message);
       Console.WriteLine("\nThe format of the myProxy address you entered is invalid");
       Console.WriteLine("\nPress any key to continue.........");
       Console.Read();
   }

  ' 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
   

Uwagi

Właściwość Proxy identyfikuje serwer proxy sieci używany przez żądanie w celu uzyskania dostępu do zasobu internetowego.The Proxy property identifies the network proxy that the request uses to access the Internet resource. Żądanie jest nawiązywane za pomocą serwera proxy, a nie bezpośrednio do zasobu internetowego.The request is made through the proxy server rather than directly to the Internet resource.

Uwaga

Klasa WebRequest jest klasą abstract.The WebRequest class is an abstract class. Rzeczywiste zachowanie wystąpień WebRequest w czasie wykonywania jest określane przez klasę podrzędną zwróconą przez metodę WebRequest.Create.The actual behavior of WebRequest instances at run time is determined by the descendant class returned by the WebRequest.Create method. Więcej informacji o domyślnych wartościach i wyjątkach znajduje się w dokumentacji dotyczącej klas podrzędnych, takich jak HttpWebRequest i FileWebRequest.For more information about default values and exceptions, see the documentation for the descendant classes, such as HttpWebRequest and FileWebRequest.

Dotyczy

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