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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
public final IEnumerator GetEnumerator ()
public final function GetEnumerator () : IEnumerator

Return Value

An IEnumerator for the CredentialCache.

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

public static void GetPage(String url, String userName, String password, 
    String domainName)
{
    try {
        CredentialCache myCredentialCache = 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));

        // Creates a webrequest with the specified url.                 
        WebRequest myWebRequest = WebRequest.Create(url);
        myWebRequest.set_Credentials(myCredentialCache);
        IEnumerator listCredentials = myCredentialCache.GetEnumerator();
        Console.WriteLine("\nDisplaying credentials stored in "
            + "CredentialCache: ");
        while (listCredentials.MoveNext()) {
            Display((NetworkCredential)listCredentials.get_Current());
        }
        Console.WriteLine("\nNow Displaying the same using 'foreach' : ");
        IEnumerator myEnumerator = myCredentialCache.GetEnumerator();
        while (myEnumerator.MoveNext()) {
            NetworkCredential credential = (NetworkCredential)myEnumerator.
                get_Current();

            // Can use foreach with CredentialCache(Since GetEnumerator 
            // function of IEnumerable has been implemented by 
            // 'CredentialCache' class.
            Display(credential);
        }

        // Send the request and waits for response.
        WebResponse myWebResponse = myWebRequest.GetResponse();

        // Process response here.
        Console.WriteLine("\nResponse Received.");
        myWebResponse.Close();
    }
    catch (WebException e) {
        if (e.get_Response() != null) {
            Console.WriteLine("\r\nFailed to obtain a response. "
                + "The following error occured : {0}", 
                ((HttpWebResponse)e.get_Response()).get_StatusDescription());
        }
        else {
            Console.WriteLine("\r\nFailed to obtain a response. "
                + "The following error occured : {0}", e.get_Status());
        }
    }
    catch (System.Exception e) {
        Console.WriteLine("\nThe following exception was raised : {0}", 
            e.get_Message());
    }
} //GetPage

public static void Display(NetworkCredential credential)
{
    Console.WriteLine("\n\tUsername : {0} ,Password : {1} ,Domain : {2}", 
        credential.get_UserName(), credential.get_Password(), credential.
        get_Domain());
} //Display

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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