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Calling a WCF service through a proxy server.

C# .NET Framework 4.0

I have an application client that calls a WCF service and in this client uses a proxy for the internet connection, so when I call my service I must first provide the proxy authentication.

I have created a class that implements the IWebProxy interface:

namespace Utililty {

   public class ProxyConfig : IWebProxy {

        public ICredentials Credentials {

            get

            {

                using (var context = new AOEntities())

                {

                    var query =

                        from data in context.ConnectionParameters

                        where data.ServerName.Equals("Proxy")

                        select data;

                    if (query.Any())

                    {

                        var parameters = query.FirstOrDefault();

                        if (parameters != null) return new NetworkCredential(parameters.UserName, parameters.Password);

                    }

                    return null;

                }               

            }

            set { }

        }

        public Uri GetProxy(Uri destination) {

            return WebRequest.GetSystemWebProxy().GetProxy(destination);

        }

        public bool IsBypassed(Uri host) {

            return WebRequest.GetSystemWebProxy().IsBypassed(host);

        }       

    }

}

In this example, I retrieve the credentials from a SQL Server database, but if you prefer you can put in the application configuration file.

Then in the application configuration file (app.config), I have added this section:

 <system.net>

   <defaultProxy>

     <module type=" Utililty.ProxyConfig, Utililty"/>

   </defaultProxy>

 </system.net>

and the attribute useDefaultWebProxy="true" at the WCF binding configuration.

The ProxyConfig object will have call automatically before your call to service.

Peace & Love!