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Getting Around InvokeRequired Without Copy and Paste

, 17 Aug 2007
Instead of copying and pasting the same if(InvokeRequired) logic in every multithreaded function, use attributes to make code cleaner, its centralize logic and make it self documenting.
threadsafeui.zip
ThreadSafeUI
AOPAttributes.suo
Castle.Core.dll
Castle.DynamicProxy2.dll
TeamAgile.SimpleInterception
AOP
bin
Debug
Castle.Core.dll
Castle.DynamicProxy2.dll
Osherove.SimpleInterception.dll
Properties
TeamAgile.SimpleInterception.csproj.user
TeamAgile.ThreadSafeUI
Properties
TeamAgile.ThreadSafeUI.csproj.user
Test
bin
Debug
Castle.Core.dll
Castle.DynamicProxy2.dll
nunit.framework.dll
Osherove.SimpleInterception.dll
Test.dll
Properties
ThreadSafeUI
bin
Debug
Castle.Core.dll
Castle.DynamicProxy2.dll
Osherove.SimpleInterception.dll
ThreadSafeUI.exe
ThreadSafeUI.vshost.exe
Properties
Settings.settings
using System;
using System.Threading;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using Osherove.SimpleInterception.AOPAttributes;

namespace AOP.UnitTest
{
    public partial class AOP_TestForm : Form
    {
        LoadTypeEnum LoadType;
        public enum LoadTypeEnum
        {
            Bad,
            GoodManual,
            GoodAOP
        }

        public AOP_TestForm() : this(LoadTypeEnum.GoodAOP)
        {
        }

        public AOP_TestForm(LoadTypeEnum LoadType)
        {
            InitializeComponent();
            this.LoadType = LoadType;
        }

        public delegate void InvokeRequiredEventType(bool isRequired);
        public event InvokeRequiredEventType InvokeRequiredEvent;

        /// <summary>
        /// This is bad behavior, directly calling UI functionality from within a thread
        /// </summary>
        private void DoThreadedBad()
        {
            if (InvokeRequiredEvent != null) InvokeRequiredEvent(textBox1.InvokeRequired);
            this.Close(); //close the form after we get the event which must be raised
        }

        public delegate void DoThreadedGoodManualType();
        /// <summary>
        /// This is good behavior, but this manual invoke required junk has to be done every time
        /// </summary>
        private void DoThreadedGoodManual()
        {
            if (this.InvokeRequired)
            {
                // Pass the same function to BeginInvoke, but the call would come on the correct thread and InvokeRequired will be false.
                this.BeginInvoke(new DoThreadedGoodManualType(DoThreadedGoodManual));

                return;
            }

            DoThreadedBad(); //now we can do our normal functionality with no worries
        }

        [RunInUIThread]
        protected virtual void DoThreadedGoodAOP()
        {
            DoThreadedBad();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void AOP_TestForm_Load(object sender, EventArgs e)
        {
            //kick off UI change in new thread, should be illegal
            Thread t = null;
            
            switch(LoadType)
            {
                case LoadTypeEnum.Bad:
                    t = new Thread(new ThreadStart(DoThreadedBad));
                    break;
                case LoadTypeEnum.GoodManual:
                    t = new Thread(new ThreadStart(DoThreadedGoodManual));
                    break;
                case LoadTypeEnum.GoodAOP:
                    t = new Thread(new ThreadStart(DoThreadedGoodAOP));
                    break;
            }

            t.Start();
        }
    }

}

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About the Author

Paul B.

United States United States
I've been a software developer since 1996 and have enjoyed C# since 2003. I have a Bachelor's degree in Computer Science and for some reason, a Master's degree in Business Administration. I currently do software development contracting/consulting.

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