Programming .NET Components, 2nd Edition

The WSLoginControl

WinFormsEx.dll contains the definition of WSLoginControl, shown in Example B-7.

Example B-7. The WSLoginControl class

public partial class WSLoginControl : LoginControl
{
   protected override IUserManager GetUserManager()
   {
      return new UserManager();
   }
}

WSLoginControl derives from LoginControl, and in its overriding of GetUserManager() it returns UserManager, a client-side web service proxy class used to invoke the UserManager web service. WSLoginControl can use any web service that manages user credentials, as long as it supports the IUserManager interface (hence its name). To generate the proxy class, add a web reference to the UserManager web service. Add to the machine-generated UserManager web service proxy class derivation from IUserManager. Since the proxy class is a partial class and is machine-generated, add that code, preferably in a separate file:

            partial class UserManager : IUserManager
    {}

WinFormsEx.dll already contains the definition of the UserManager web service proxy class. The code in the proxy class looks up the web service address from the application configuration file. Under the appSettings section, add to the application configuration file a key called UserManager, whose value is the web service address:

    <?xml version="1.0"?>
    <configuration>
       <appSettings>
          <add key="UserManager"
               value="http://localhost/SecurityServices/UserManager.asmx"/>
       </appSettings>
    </configuration>

Figure B-5 shows WSLoginControl and CustomPrincipal, and their interaction ...