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Asked: 2026-05-10T21:20:48+00:00

I have a .NET class library containing a class with a method that performs

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I have a .NET class library containing a class with a method that performs some lengthy operation. When a client calls this method it should perform the lengthy operation on a new thread in order to avoid blocking the caller. But once the method finishes it should execute some code on the main thread. In a WinForms application I could have used the System.Windows.Forms.Control.Invoke method but this is not my case. So how can I achieve this in C#?

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1 Answer

  1. I found a simple solution to the problem :

    My COM object is declared like this:

    public class Runner {     public void Run(string executable, object processExitHandler)     {         ThreadPool.QueueUserWorkItem(state =>         {             var p = new Process()             {                 StartInfo = new ProcessStartInfo()                 {                     FileName = executable                 }             };             p.Start();             while (!p.HasExited)             {                 Thread.Sleep(100);             }              state                 .GetType()                 .InvokeMember(                     'call',                      BindingFlags.InvokeMethod,                      null,                      state,                      new object[] { null, p.ExitCode }                 );         }, processExitHandler);     } }

    And in my HTML page I use it like this:

    <!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01//EN' 'http://www.w3.org/TR/html4/strict.dtd'> <html> <head><title>ActiveXRunner</title>         <script type='text/javascript'>     function runNotepad() {         var ax = new ActiveXObject('ActiveXRunner.Runner');         ax.Run('c:\\windows\\notepad.exe', h);     }      function h(exitCode) {         alert('exitCode = ' + exitCode);     }     </script> </head> <body>     <a href='#' onclick='runNotepad();'>Run notepad and show exit code when finished</a> </body> </html>
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