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WPF Control Factory

, 20 Apr 2010 CPOL
This article explains some advantages and disadvantages of factories, and shows one to use for generating WPF Controls.
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
WpfControlFactorySample.suo
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;

namespace Pfz.Collections
{
	/// <summary>
	/// Read-only wrapper for dictionaries.
	/// </summary>
	[Serializable]
	public sealed class ReadOnlyDictionary<TKey, TValue>:
		IDictionary<TKey, TValue>
	{
		private IDictionary<TKey, TValue> fDictionary;
		
		#region Constructor
			/// <summary>
			/// Creates a new read-only dictionary over an already existing
			/// modifiable dictionary.
			/// </summary>
			public ReadOnlyDictionary(IDictionary<TKey, TValue> modifiableDictionary)
			{
				if (modifiableDictionary == null)
					throw new ArgumentNullException("modifiableDictionary");
			
				if (modifiableDictionary is ReadOnlyDictionary<TKey, TValue>)
					throw new ArgumentException("Do not create a ReadOnlyDictionary of a ReadOnlyDictionary.");
				
				fDictionary = modifiableDictionary;
			}
		#endregion
	
		#region Properties
			#region Keys
				/// <summary>
				/// Gets the keys of the items in this dictionary.
				/// </summary>
				public ICollection<TKey> Keys
				{
					get
					{
						return fDictionary.Keys;
					}
				}
			#endregion
			#region Values
				/// <summary>
				/// Gets the values in this dictionary.
				/// </summary>
				public ICollection<TValue> Values
				{
					get
					{
						return fDictionary.Values;
					}
				}
			#endregion
			#region Count
				/// <summary>
				/// Gets the number of items in this dictionary.
				/// </summary>
				public int Count
				{
					get
					{
						return fDictionary.Count;
					}
				}
			#endregion
			#region this[]
				/// <summary>
				/// Gets a value by it's key.
				/// Throws an exception if the key does not exist.
				/// </summary>
				public TValue this[TKey key]
				{
					get
					{
						return fDictionary[key];
					}
				}
			#endregion
		#endregion
		#region Methods
			#region ContainsKey
				/// <summary>
				/// Returns true if this dictionary contains the given key.
				/// </summary>
				public bool ContainsKey(TKey key)
				{
					return fDictionary.ContainsKey(key);
				}
			#endregion
			#region TryGetValue
				/// <summary>
				/// Tries to get the value for the given key.
				/// If there is no item with the given key, returns null.
				/// </summary>
				public bool TryGetValue(TKey key, out TValue value)
				{
					return fDictionary.TryGetValue(key, out value);
				}
			#endregion
			#region CopyTo
				/// <summary>
				/// Copies the key/value pairs to an array.
				/// </summary>
				public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
				{
					fDictionary.CopyTo(array, arrayIndex);
				}
			#endregion
			#region Contains
				/// <summary>
				/// Verifies if the given pair exists in the dictionary.
				/// </summary>
				public bool Contains(KeyValuePair<TKey, TValue> item)
				{
					return fDictionary.Contains(item);
				}
			#endregion
			#region GetEnumerator
				/// <summary>
				/// Gets an enumerator over all the key/value pairs in this
				/// dictionary.
				/// </summary>
				public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
				{
					return fDictionary.GetEnumerator();
				}
			#endregion
		#endregion

		#region IDictionary<TKey,TValue> Members
			TValue IDictionary<TKey, TValue>.this[TKey key]
			{
				get
				{
					return fDictionary[key];
				}
				set
				{
					throw new ReadOnlyException();
				}
			}

			void IDictionary<TKey, TValue>.Add(TKey key, TValue value)
			{
				throw new ReadOnlyException();
			}
			bool IDictionary<TKey, TValue>.Remove(TKey key)
			{
				throw new ReadOnlyException();
			}
		#endregion
		#region ICollection<KeyValuePair<TKey,TValue>> Members
			void ICollection<KeyValuePair<TKey,TValue>>.Add(KeyValuePair<TKey, TValue> item)
			{
				throw new ReadOnlyException();
			}
			void ICollection<KeyValuePair<TKey,TValue>>.Clear()
			{
				throw new ReadOnlyException();
			}
			bool ICollection<KeyValuePair<TKey,TValue>>.IsReadOnly
			{
				get
				{
					return true;
				}
			}
			bool ICollection<KeyValuePair<TKey,TValue>>.Remove(KeyValuePair<TKey, TValue> item)
			{
				throw new ReadOnlyException();
			}
		#endregion
		#region IEnumerable Members
			IEnumerator IEnumerable.GetEnumerator()
			{
				return GetEnumerator();
			}
		#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 hobbyist, 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 their 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 & 2016
Microsoft MVP 2013-2014 (now I work at Microsoft so I can't be a Microsoft MVP anymore)

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