Using Remoting from Webservice?

Question

Does anyone know how I can use remoting from a webservice. I did one and it works fine the first time. But when i call the webservice method again it does not work. I tried to catch the error and it showed to be Channel already registered. I try to register the channel in the constructor but it did not work!! so does anyone know how thos can be done? or lead me to some tutorial? thanks in advance for any help :)

spgilmore · Answer

I'm more of a webservice guy than a remoting guy but it seems to me that you either failed to unregister the channel in the last transaction or you should first check to see if the channel is registered before you register it. If you cannot register a channel twice I recommend that you check first to see if it is registered or simply trap the exception when you try. I believe that the channel is probably global so you will have multiple webservice requests all trying to create the same channel at the same time or at least subsequently and they will naturally collide and conflict unless they are multi-instance aware (a.k.a. thread-safe). This may also be a result of the fact that .NET remoting is not necessarily stateless whereas webservices are absolutely stateless. Every time you hit the web service with a request it starts over by creating an instance of the webservice implementation class. Any previous interactions on the remoting side are forgotten. Hence your remoting must work in a stateless fashion too.

sim085 · Answer

Further detail .. this is my webservice code: using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Diagnostics; using System.Web; using System.Web.Services; using System.Runtime.Remoting; using System.Runtime.Remoting.Channels; using System.Runtime.Remoting.Channels.Tcp; // The namespace of the class object I am gona connect with. using Simboy.HomeManagementSystem.Home.Control; namespace Simboy.HomeManagementSystem.Web.Control { public class HomeControlService : System.Web.Services.WebService { // The Tcp channel I am using to connect with server. TcpClientChannel channel = new TcpClientChannel(); public HomeControlService() { InitializeComponent(); ChannelServices.RegisterChannel(channel); } #region Component Designer generated code //Required by the Web Services Designer private IContainer components = null; /// /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// private void InitializeComponent() { } /// /// Clean up any resources being used. /// protected override void Dispose( bool disposing ) { if(disposing && components != null) { components.Dispose(); } base.Dispose(disposing); } #endregion [WebMethod] public string HelloWorld() { return Hello World; } [WebMethod] public string[] GetDevicesNames(string ipAddress) { // Register the well known object. RemotingConfiguration.RegisterWellKnownClientType (typeof(HomeControl) tcp://+ipAddress+:1234/HomeControl); HomeControl homeControl = new HomeControl(); homeControl.LoadXml(); // loading text file from server // return string array. return homeControl.DevicesNames; } } } NOTE: The above web service works fine the first time but the second time I invoke the method it would not work :(