Good point. If I have got my own thread, then it is not a problem to set the apartment state. But what happens if I do it with a threadpool thread (delegate.BeginInvoke)? The documentation says it could be set only once.
My background task is a 'BeginXXX' call to an object and I'm pretty sure, the callback will be a threadpool thread. That's why I was looking for an ' ISynchronizeInvoke' implementation. -----Ursprüngliche Nachricht----- Von: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] Im Auftrag von Dean Cleaver Gesendet: Mittwoch, 1. Februar 2006 09:39 An: [email protected] Betreff: Re: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] Excel AddIn and Threads Well, I had to set it in my Outlook Addin, so yeah - I am sure you have to set it. Besides, doesn't hurt if you do. -----Original Message----- From: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] On Behalf Of Andreas Heisel Sent: Wednesday, 1 February 2006 21:36 To: [email protected] Subject: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] Excel AddIn and Threads So you think the runtime will do the necessary synchronisation, right? Are you sure I have to set the apartment state? If I remember correct, the runtime will put any thread that is not assigned to an apartment into the MTA if it uses COM interop. If Excel runs in a STA, shouldn't the COM runtime marshal from the MTA to the STA? -----Ursprüngliche Nachricht----- Von: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] Im Auftrag von Dean Cleaver Gesendet: Mittwoch, 1. Februar 2006 08:37 An: [email protected] Betreff: Re: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] Excel AddIn and Threads "And the" = "as the" -----Original Message----- From: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] On Behalf Of Dean Cleaver Sent: Wednesday, 1 February 2006 20:32 To: [email protected] Subject: Re: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] Excel AddIn and Threads On a usercontrol or form - not much use to you. If you start any threads, ensure they have the same apartment state and the calling thread: Thread thread = new Thread(new ThreadStart(targetProc)); thread.SetApartmentState(System.Threading.Thread.CurrentThread.GetApartmentS tate()); HHT Dino -----Original Message----- From: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] On Behalf Of Andreas Heisel Sent: Wednesday, 1 February 2006 20:29 To: [email protected] Subject: [ADVANCED-DOTNET] AW: [ADVANCED-DOTNET] Excel AddIn and Threads On what object do you call 'Invoke.Required'? -----Ursprüngliche Nachricht----- Von: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] Im Auftrag von Alex Smotritsky Gesendet: Mittwoch, 1. Februar 2006 08:11 An: [email protected] Betreff: Re: [ADVANCED-DOTNET] Excel AddIn and Threads If in the background thread you're not accessing any shared resources you may not need to do any synchronization. You can use BeginInvoke with a delegate to call a function and put it on a background thread to do background processing. Some people will use a callback to set off a function that say accesses excel, I usually don't do that. I'll call that function at the end of the method that does the background task. In that called function I'll use if (Invoke.Required) to switch back to the ui thread if necessary or not if the function doesn't touch the ui and then that function can do whatever it needs to do. -----Original Message----- From: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] On Behalf Of Andreas Heisel Sent: Wednesday, February 01, 2006 1:37 AM To: [email protected] Subject: [ADVANCED-DOTNET] Excel AddIn and Threads Hello, I'm developing an Excel addin. I want to do some work on a background thread. At the end of the background processing I need to access Excel to insert some data into a worksheet. Do I need to do any synchronisation as in a windows forms application? If I need to, how should I do it? I haven't found an ISynchronizeInvoke implementation. Or does the runtime do the synchronisation? The Excel classes are COM interop. 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