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Posted 26 Oct 2005

A DelegateQueue Class

, 13 Mar 2007
An implementation of the ISynchronizeInvoke interface.
using System;
using System.Diagnostics;
using System.Threading;

namespace Sanford.Threading
{
    public partial class DelegateQueue
    {
        private enum NotificationType
        {
            None,
            BeginInvokeCompleted,
            PostCompleted
        }

        /// <summary>
        /// Implements the IAsyncResult interface for the DelegateQueue class.
        /// </summary>
        private class DelegateQueueAsyncResult : AsyncResult
        {
            // The delegate to be invoked.
            private Delegate method;

            // Args to be passed to the delegate.
            private object[] args;

            // The object returned from the delegate.
            private object returnValue = null;

            // Represents a possible exception thrown by invoking the method.
            private Exception error = null;

            private NotificationType notificationType;

            public DelegateQueueAsyncResult(
                object owner, 
                Delegate method, 
                object[] args, 
                bool synchronously, 
                NotificationType notificationType) 
                : base(owner, null, null)
            {
                this.method = method;
                this.args = args;
                this.notificationType = notificationType;
            }

            public void Invoke()
            {
                try
                {
                    returnValue = method.DynamicInvoke(args);
                }
                catch(Exception ex)
                {
                    error = ex;
                }
                finally
                {
                    Signal();
                }
            }

            public object[] GetArgs()
            {
                return args;
            }

            public object ReturnValue
            {
                get
                {
                    return returnValue;
                }
            }

            public Exception Error
            {
                get
                {
                    return error;
                }
                set
                {
                    error = value;
                }
            }

            public Delegate Method
            {
                get
                {
                    return method;
                }
            }

            public NotificationType NotificationType
            {
                get
                {
                    return notificationType;
                }
            }
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Leslie Sanford
United States United States
Aside from dabbling in BASIC on his old Atari 1040ST years ago, Leslie's programming experience didn't really begin until he discovered the Internet in the late 90s. There he found a treasure trove of information about two of his favorite interests: MIDI and sound synthesis.

After spending a good deal of time calculating formulas he found on the Internet for creating new sounds by hand, he decided that an easier way would be to program the computer to do the work for him. This led him to learn C. He discovered that beyond using programming as a tool for synthesizing sound, he loved programming in and of itself.

Eventually he taught himself C++ and C#, and along the way he immersed himself in the ideas of object oriented programming. Like many of us, he gotten bitten by the design patterns bug and a copy of GOF is never far from his hands.

Now his primary interest is in creating a complete MIDI toolkit using the C# language. He hopes to create something that will become an indispensable tool for those wanting to write MIDI applications for the .NET framework.

Besides programming, his other interests are photography and playing his Les Paul guitars.

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