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CredentialCache.GetEnumerator Method

Returns an enumerator that can iterate through the CredentialCache instance.

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

'Declaration
Public Function GetEnumerator As IEnumerator
'Usage
Dim instance As CredentialCache 
Dim returnValue As IEnumerator 

returnValue = instance.GetEnumerator()

Implements

IEnumerable.GetEnumerator

The following code example uses the GetEnumerator method to return an enumerator that can iterate through the CredentialCache instance.

    Try 
        Dim myCredentialCache As New CredentialCache
        ' Dummy Credentials used here.             
        myCredentialCache.Add(New Uri("http://microsoft.com/"), "Basic", New NetworkCredential("user1", "passwd1", "domain1"))
        myCredentialCache.Add(New Uri("http://msdn.com/"), "Basic", New NetworkCredential("user2", "passwd2", "domain2"))

        myCredentialCache.Add(New Uri(url), "Basic", New NetworkCredential(userName, password, domainName))
        Dim myWebRequest As WebRequest = WebRequest.Create(url) 'Creates a webrequest with the specified url 
        myWebRequest.Credentials = myCredentialCache
        Dim listCredentials As IEnumerator = myCredentialCache.GetEnumerator()
        Console.WriteLine("Displaying credentials stored in CredentialCache: ")
        While listCredentials.MoveNext()
            Display(CType(listCredentials.Current, NetworkCredential))
        End While
        Console.WriteLine(ControlChars.Cr + "Now Displaying using 'foreach': ")
        ' Can use foreach with CredentialCache(Since GetEnumerator method of IEnumerable has been implemented by 'CredentialCache' class. 
        Dim credential As NetworkCredential
        For Each credential In myCredentialCache
            Display(credential)
        Next credential
        Dim myWebResponse As WebResponse = myWebRequest.GetResponse() 'Sends the request and waits for response.
        ' Process the response here
        Console.WriteLine(ControlChars.Cr + "Response Received.")
        myWebResponse.Close()

    Catch e As WebException
        If Not (e.Response Is Nothing) Then
            Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "Failed to obtain a response. The following error occured : {0}", CType(e.Response, HttpWebResponse).StatusDescription)
        Else
            Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "Failed to obtain a response. The following error occured : {0}", e.Status)
        End If 
    Catch e As Exception
        Console.WriteLine(ControlChars.Cr + "The following exception was raised : {0}", e.Message)
    End Try 

End Sub 'GetPage

Public Shared Sub Display(credential As NetworkCredential)
    Console.WriteLine(ControlChars.Cr + "Username : {0} ,Password : {1} ,Domain : {2}", credential.UserName, credential.Password, credential.Domain)
End Sub 'Display
void Display(NetworkCredential* credential)
{
   Console::WriteLine(S"\n\tUsername : {0} , Password : {1} , Domain : {2}",
      credential->UserName, credential->Password, credential->Domain);
}

void GetPage(String* url, String* userName, String* password, String* domainName)
{
   try
   {
      CredentialCache* myCredentialCache = new CredentialCache();
      // Dummy Credentials used here.
      myCredentialCache->Add(new Uri(S"http://microsoft.com/"), S"Basic",
         new NetworkCredential(S"user1", S"passwd1", S"domain1"));
      myCredentialCache->Add(new Uri(S"http://msdn.com/"), S"Basic",
         new NetworkCredential(S"user2", S"passwd2", S"domain2"));

      myCredentialCache->Add(new Uri(url), S"Basic", new NetworkCredential(userName, password, domainName));
      // Creates a webrequest with the specified url.
      WebRequest* myWebRequest = WebRequest::Create(url);
      myWebRequest->Credentials = myCredentialCache;
      IEnumerator* listCredentials = myCredentialCache->GetEnumerator();

      Console::WriteLine(S"\nDisplaying credentials stored in CredentialCache: ");
      while(listCredentials->MoveNext())
         Display(dynamic_cast<NetworkCredential*>(listCredentials->Current));
      Console::WriteLine(S"\nNow Displaying the same using 'foreach' : ");
      // Can use foreach with CredentialCache(Since GetEnumerator function of IEnumerable* has been implemented by 'CredentialCache' class.
      IEnumerator* myEnum = myCredentialCache->GetEnumerator();
      while (myEnum->MoveNext())
      {
         NetworkCredential* credential = __try_cast<NetworkCredential*>(myEnum->Current);
         Display(credential);
      }
      // Send the request and waits for response.
      WebResponse* myWebResponse = myWebRequest->GetResponse();

      // Process response here.
      Console::WriteLine(S"\nResponse Received.");
      myWebResponse->Close();
   }
   catch (WebException* e)
   {
      if (e->Response != 0)
         Console::WriteLine(S"\r\nFailed to obtain a response. The following error occured : {0}",
         (dynamic_cast<HttpWebResponse*>(e->Response))->StatusDescription);
      else
         Console::WriteLine(S"\r\nFailed to obtain a response. The following error occured : {0}",
         __box(               e->Status));
   }
   catch (Exception* e)
   {
      Console::WriteLine(S"\nThe following exception was raised : {0}",
         e->Message);
   }
};

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

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