Observable property pattern, memory leaks, and weak delegates for .NET

Alexey A. Popov

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4 Dec 200624 min read

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This article is dedicated to the observable property design pattern, a very nice pattern used in the Microsoft .NET Framework, a possible memory leak problem with it, and gives a couple of ways to solve it.

observable_property_pattern.zip
- WeakDelegates
  - ConsoleTest
    - AssemblyInfo.cs
    - ConsoleTest.cmbx
    - ConsoleTest.csproj
    - ConsoleTest.csproj.user
    - ConsoleTest.prjx
    - Entry.cs
  - NonPublicTest
    - AssemblyInfo.cs
    - Entry.cs
    - NonPublicTest.cmbx
    - NonPublicTest.csproj
    - NonPublicTest.csproj.user
    - NonPublicTest.prjx
    - NonPublicTest.sln
  - Pvax.WeakDelegates.Tests.nunit
  - Pvax.WeakDelegates.Tests
    - AssemblyInfo.cs
    - Constants.cs
    - CustomEvent.cs
    - DoubleHandler.cs
    - DoubleHandler2.cs
    - DoubleHandler5.cs
    - EventSink.cs
    - EventSink2.cs
    - EventSource.cs
    - EventSource2.cs
    - Net20
      - Generics.cs
      - TestGenericEvent.cs
      - TestPropertyChanged.cs
    - PointFHandler.cs
    - PointFHandler2.cs
    - PointFHandler5.cs
    - Pvax.WeakDelegates.Tests.cmbx
    - Pvax.WeakDelegates.Tests.csproj
    - Pvax.WeakDelegates.Tests.csproj.user
    - Pvax.WeakDelegates.Tests.prjx
    - StringHandler.cs
    - StringHandler2.cs
    - StringHandler5.cs
    - TestBase.cs
    - TestCustomEvent.cs
    - TestDouble2Event.cs
    - TestDouble5Event.cs
    - TestDoubleEvent.cs
    - TestEvent.cs
    - TestOverrideHandler.cs
    - TestPointF2Event.cs
    - TestPointF5Event.cs
    - TestPointFEvent.cs
    - TestString2Event.cs
    - TestString5Event.cs
    - TestStringEvent.cs
    - TestVoid2Event.cs
    - TestVoid5Event.cs
    - TestVoidEvent.cs
    - VoidHandler.cs
    - VoidHandler2.cs
    - VoidHandler5.cs
  - Pvax.WeakDelegates
    - AssemblyInfo.cs
    - Builder.cs
    - Pvax.WeakDelegates.cmbx
    - Pvax.WeakDelegates.csproj
    - Pvax.WeakDelegates.csproj.user
    - Pvax.WeakDelegates.prjx
    - RD.cs
    - strings.resources
    - WeakDelegateDecorator.cs
  - UsubscribeTest
    - AssemblyInfo.cs
    - DelegateUtil.cs
    - Main.cs
    - UsubscribeTest.cmbx
    - UsubscribeTest.csproj
    - UsubscribeTest.csproj.user
    - UsubscribeTest.prjx
  - WeakDelegates.cmbx
  - WeakDelegates.FxCop
  - WeakDelegates.sln
  - WeakDelegates.suo
  - WinFormsIdleTest
    - AssemblyInfo.cs
    - Entry.cs
    - MainForm.cs
    - MainForm.resources
    - Pvax.App.WinFormsIdleTest.MainForm.resources
    - Pvax.App.WinFormsIdleTest.StickyForm.resources
    - StickyForm.cs
    - StickyForm.resources
    - WinFormsIdleTest.cmbx
    - WinFormsIdleTest.csproj
    - WinFormsIdleTest.csproj.user
    - WinFormsIdleTest.prjx

using System;
using System.Runtime.InteropServices;

namespace Pvax.WeakDelegates.Tests
{
	/// <summary>
	/// Description of DoubleHandler delegate.
	/// </summary>
	[Serializable]
	[ComVisible(false)]
	public delegate double DoubleHandler5(object sender, string arg2, int arg3, DateTime arg4, float arg5);
}

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Written By

Alexey A. Popov

Web Developer

Russian Federation

I'm a system administrator from Moscow, Russia. Programming is one of my hobbies. I presume I'm one of the first Russians who created a Web site dedicated to .Net known that time as NGWS. However, the Web page has been abandoned a long ago.

Observable property pattern, memory leaks, and weak delegates for .NET

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