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WPF Control Factory

, 20 Apr 2010
This article explains some advantages and disadvantages of factories, and shows one to use for generating WPF Controls.
WpfControlsAndSample.zip
WpfControlsAndSample
Pfz.ClassLibraries
Pfz
Caching
Collections
DataTypes
Extensions
Pfz.snk
Properties
Ranges
Threading
Pfz.WpfControls
BoundGridParts
Extensions
Pfz.WpfControls.snk
Properties
TypeConverters
WpfControlFactorySample
bin
Debug
Pfz.dll
Pfz.WpfControls.dll
WpfControlFactorySample.exe
Properties
Settings.settings
WpfControlFactorySample.suo
using System;
using System.IO;
using Pfz.Extensions.DisposeExtensions;
using Pfz.Extensions.MonitorLockExtensions;
using Pfz.Threading;

namespace Pfz
{
	/// <summary>
	/// Stream class that has a Dispose receiving an Exception as the cause
	/// of the dispose. Calling any method after the dispose will throw a
	/// new ObjectDisposedException with that exception as the inner exception.
	/// </summary>
	public abstract class ExceptionAwareStream:
		Stream,
		IExceptionAwareDisposable
	{
		/// <summary>
		/// Disposes the stream and sets the DisposeException.
		/// </summary>
		public void Dispose(Exception exception)
		{
			DisposeException = exception;
			Dispose();
		}
		
		/// <summary>
		/// Implemented to guarantee that it will be executed only once.
		/// You must reimplement DoDispose, as this method is sealed.
		/// </summary>
		protected sealed override void Dispose(bool disposing)
		{
			IDisposable lockDisposer = null;
			try
			{
				AbortSafe.Run(() => lockDisposer = DisposeLock.LockWithTimeout());

				if (WasDisposed)
					return;
				
				try
				{
				}
				finally
				{
					WasDisposed = true;
					lockDisposer.Dispose();
					OnDispose(disposing);
				}
			}
			finally
			{
				lockDisposer.CheckedDispose();
			}
		}
		
		/// <summary>
		/// Does the effective dispose.
		/// </summary>
		protected virtual void OnDispose(bool disposing)
		{
			base.Dispose(disposing);
		}

		private object fDisposeLock = new object();
		/// <summary>
		/// Gets the lock that should be used by the object.
		/// </summary>
		public object DisposeLock
		{
			get
			{
				return fDisposeLock;
			}
		}

		/// <summary>
		/// Gets the exception that caused the Dispose, if any.
		/// </summary>
		public Exception DisposeException { get; private set; }

		/// <summary>
		/// Gets a value indicating if this object was already disposed.
		/// </summary>
		public bool WasDisposed { get; private set; }

		/// <summary>
		/// Checks if this object was disposed. If it is, throws an exception.
		/// </summary>
		public void CheckUndisposed()
		{
			var disposeException = DisposeException;
			if (disposeException != null)
				throw new ObjectDisposedException("Object disposed: " + GetType().FullName, disposeException);
			
			if (WasDisposed)
				throw new ObjectDisposedException(GetType().FullName);
		}
	}
}

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License

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

About the Author

Paulo Zemek
Architect
Canada Canada
I started to program computers when I was 11 years old, as a hobbist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
 
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do they work easier, faster and with less errors.
 
Want more info or simply want to contact me?
Take a look at: http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
 
Codeproject MVP 2012
Microsoft MVP 2013

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