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BeginInvoke, plz help Messages   Related Types This message was discovered on microsoft.public.dotnet.languages.csharp. Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions. Post a new message to this list... MakeMeHappy Hi, I have some problems with understand how to call BeginInvoke properly so I need your help... I have a "worker" thread in my app where I download a website, and after some processing on html code I want to fire event from the "worker" thread (my EventArg is a object which describles some data extracted from html code), whose body (event body) must update datagrid control (which should be done in main application thread, I suppose), but I don't know how to fire that event with BeginInvoke... plz help Regards! (Sorry for my poor English...) Reply to this message...        Jon Skeet [C# MVP] (VIP) MakeMeHappy <Click here to reveal e-mail address> wrote: [Original message clipped] Have a look at http://www.pobox.com/~skeet/csharp/multithreading.html#windows.forms -- Jon Skeet - <Click here to reveal e-mail address> http://www.pobox.com/~skeet If replying to the group, please do not mail me too Reply to this message...        FusionGuy Here's a basic example: // Basic asynchronous callback design using System; using System.Threading; public class Class1 { // create the delegate private delegate void DoSomethingDelegate(); ... } private void SomeMethod() { // instantiate the delegate DoSomethingDelegate dlgt = new DoSomethingDelegate(LongRunningMethod); // the method to call when the asynchronous method completes ASyncCallback cb = new ASyncCallback(OnMethodComplete); // start the asynchronous process; returns immediately IAsyncResult ar = dlgt.BeginInvoke(cb, null); // some code to update the UI BeginUIUpdate(); } // The method called when the // asynchronous process completes private void OnMethodComplete() { // do some UI update here... } } "Jon Skeet [C# MVP]" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Jon Skeet [C# MVP] (VIP) <"FusionGuy" <sbearusa32 at em s n dot com (that's msn.com)>> wrote: [Original message clipped] No, that doesn't work properly - using Delegate.BeginInvoke will mean that OnMethodComplete is called in a thread pool thread, not the UI thread, so you can't do any UI updating there. You need to call Control.Invoke or Control.BeginInvoke. -- Jon Skeet - <Click here to reveal e-mail address> http://www.pobox.com/~skeet If replying to the group, please do not mail me too Reply to this message...        FusionGuy This is the way it was done in a recent MS Webcast. Nothing was ever mentioned about Control.BeginInvoke...? "Jon Skeet [C# MVP]" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Jon Skeet [C# MVP] (VIP) <"FusionGuy" <sbearusa32 at em s n dot com (that's msn.com)>> wrote: [Original message clipped] Are you sure it was updating the UI? It's possible that the webcast was wrong, of course... The golden rule of Windows Forms threading is that you don't update the UI from any thread other than the one which created the control you're updating, and Delegate.BeginInvoke is going to execute on a thread pool thread rather than the UI thread, definitely. See the link I posted before for more information. -- Jon Skeet - <Click here to reveal e-mail address> http://www.pobox.com/~skeet If replying to the group, please do not mail me too Reply to this message...        Etienne Boucher Maybe you could use the Control.Invoke method on your datagrid from the worker thread. Etienne Boucher "MakeMeHappy" <Click here to reveal e-mail address> a écrit dans le message de news:Click here to reveal e-mail address... > Hi, I have some problems with understand how to call BeginInvoke properly so [Original message clipped] Reply to this message...     System.Delegate System.IAsyncResult System.Web.UI.Control Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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