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WPF Control Factory

, 20 Apr 2010 CPOL 18.7K 289 16
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;

namespace Pfz.DataTypes
{
	/// <summary>
	/// A class that simple "box" any value type.
	/// Sometimes I use this when I need to change single instances of integers and longs.
	/// Also, this is useful to simulate any "ref" parameter, if you can't really count
	/// with a ref parameter.
	/// </summary>
	/// <typeparam name="T">The type of the value to "box" inside a class.</typeparam>
	public class Box<T>:
		IEquatable<Box<T>>,
		IValueContainer<T>
	{
		/// <summary>
		/// Default constructor.
		/// </summary>
		public Box()
		{
		}
		
		/// <summary>
		/// Initializes the box with the given value.
		/// </summary>
		/// <param name="value">The value to initialize the box.</param>
		public Box(T value)
		{
			Value = value;
		}
	
		/// <summary>
		/// The boxed value. Used as a direct field so you can pass it when a ref is needed.
		/// </summary>
		public T Value;

		/// <summary>
		/// Compares this box with a value or another box.
		/// </summary>
		public override bool Equals(object obj)
		{
			if (obj is T)
				return object.Equals(Value, obj);
				
			Box<T> other = obj as Box<T>;
			if (other != null)
				return Equals(other);
			
			return base.Equals(obj);
		}
		
		/// <summary>
		/// Compares this box with another box.
		/// </summary>
		public bool Equals(Box<T> other)
		{
			return object.Equals(Value, other.Value);
		}

		/// <summary>
		/// Gets the hashcode of the value or, if it is null, returns 0.
		/// </summary>
		public override int GetHashCode()
		{
			if (Value == null)
				return 0;
				
			return Value.GetHashCode();
		}

		/// <summary>
		/// Gets the ToString of the value held.
		/// </summary>
		public override string ToString()
		{
			if (Value == null)
				return null;
				
			return Value.ToString();
		}

		#region IValueContainer<T> Members
			T IValueContainer<T>.Value
			{
				get
				{
					return Value;
				}
				set
				{
					Value = value;
				}
			}
		#endregion
		#region IValueContainer Members
			object IValueContainer.Value
			{
				get
				{
					return Value;
				}
				set
				{
					Value = (T)value;
				}
			}
		#endregion
	}
}

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About the Author

Paulo Zemek
Engineer Microsoft Corporation
United States United States
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.

Now I just started working as a Senior Software Engineer at Microsoft.

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, 2015
Microsoft MVP 2013-2014

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