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WPF Control Factory

, 20 Apr 2010 CPOL 19.3K 296 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;
using Pfz.Extensions.AttributeExtensions;

namespace Pfz.Ranges
{
	/// <summary>
	/// Methods for discovering Range characteristics.
	/// </summary>
	public static class Range
	{
		/// <summary>
		/// Gets the RangeAttribute of the given rangeType.
		/// </summary>
		public static RangeAttribute GetRangeAttribute(Type rangeType)
		{
			if (rangeType == null)
				throw new ArgumentNullException();

			var attribute = rangeType.GetCustomAttribute<RangeAttribute>();
			if (attribute == null)
				throw new ArgumentException(rangeType.FullName + " does not have a RangeAttribute associated with it.", "rangeType");
				
			return attribute;
		}

		/// <summary>
		/// Gets the typed minimum value of the given range.
		/// </summary>
		public static TValue GetMinimumValue<TRange, TValue>()
		where
			TRange: Range<TValue>
		where
			TValue: IComparable<TValue>
		{
			return (TValue)Convert.ChangeType(GetMinimumValue(typeof(TRange)), typeof(TValue));
		}
		
		/// <summary>
		/// Gets the untyped minimum value of the given range type.
		/// </summary>
		public static object GetMinimumValue(Type rangeType)
		{
			var attribute = GetRangeAttribute(rangeType);
				
			return attribute.MinimumValue;
		}
		
		/// <summary>
		/// Gets the typed maximum value of the given range.
		/// </summary>
		public static TValue GetMaximumValue<TRange, TValue>()
		where
			TRange: Range<TValue>
		where
			TValue: IComparable<TValue>
		{
			return (TValue)Convert.ChangeType(GetMaximumValue(typeof(TRange)), typeof(TValue));
		}
		
		/// <summary>
		/// Gets the untyped maximum value of the given range type.
		/// </summary>
		public static object GetMaximumValue(Type rangeType)
		{
			var attribute = GetRangeAttribute(rangeType);
				
			return attribute.MaximumValue;
		}
	}
	
	/// <summary>
	/// Base class responsible for holding values while validating its ranges.
	/// You must inherit it and apply a RangeAttribute to tell which values are 
	/// used as minimum and maximum.
	/// </summary>
	/// <typeparam name="T">The type of the Value property.</typeparam>
	[Serializable]
	public abstract class Range<T>:
		IRange
	where
		T: IComparable<T>
	{
		/// <summary>
		/// Instantiates a new Range with the given value.
		/// </summary>
		public Range(T value)
		{
			Value = value;
		}
	
		/// <summary>
		/// Gets the MinimumValue allowed by this range.
		/// </summary>
		public T MinimumValue
		{
			get
			{
				var minimumValue = Range.GetMinimumValue(GetType());
				return (T)Convert.ChangeType(minimumValue, typeof(T));
			}
		}
		
		/// <summary>
		/// Gets the MaximumValue allowed by this range.
		/// </summary>
		public T MaximumValue
		{
			get
			{
				var maximumValue = Range.GetMaximumValue(GetType());
				return (T)Convert.ChangeType(maximumValue, typeof(T));
			}
		}
		
		private T fValue;
		/// <summary>
		/// Gets or sets the value.
		/// </summary>
		public T Value
		{
			get
			{
				return fValue;
			}
			set
			{
				if (value == null)
					throw new ArgumentNullException("value");
				
				if (value.CompareTo(MinimumValue) < 0)
				{
					string message = string.Format("value can't be less than {0}.", MinimumValue);
					throw new ArgumentOutOfRangeException("value", message);
				}
				
				if (value.CompareTo(MaximumValue) > 0)
				{
					string message = string.Format("value can't be greater than {0}.", MaximumValue);
					throw new ArgumentOutOfRangeException("value", message);
				}
				
				fValue = value;
			}
		}

		#region IRange Members
			Type IRange.DataType
			{
				get 
				{
					return typeof(T);
				}
			}
			object IRange.MinimumValue
			{
				get 
				{
					return MinimumValue;
				}
			}

			object IRange.MaximumValue
			{
				get 
				{
					return MaximumValue;
				}
			}

			object IRange.Value
			{
				get
				{
					return Value;
				}
				set
				{
					Value = (T)Convert.ChangeType(value, typeof(T));
				}
			}
		#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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