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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011 CPOL 10.2K 296 25
This article will present two alternatives to Lazy.
LazyAlternatives.zip
LazyAlternatives
LazyAlternatives.suo
LazyAlternativesSample
Properties
Settings.settings
Pfz
Caching
Collections
DataTypes
DynamicObjects
Internal
Extensions
Factoring
Pfz.csproj.user
Pfz.Phone.csproj.user
Pfz.ruleset
Pfz.Silverlight.csproj.user
Pfz.snk
Pfz.suo
PhoneSpecific
Properties
Remoting
Instructions
Internal
Serializers
Udp
Serialization
BinaryBuiltIn
Threading
Contexts
Disposers
Unsafe
using System;
using Pfz.Extensions;

namespace Pfz.DataTypes
{
	/// <summary>
	/// Wrapper for enums that shows their DisplayName (which can be set by DisplayNameAttribute)
	/// when ToString is invoked.
	/// </summary>
	public struct EnumWrapper:
		IEquatable<EnumWrapper>
	{
		/// <summary>
		/// Creates a new wrapper over the given enum.
		/// </summary>
		public EnumWrapper(Enum value)
		{
			_value = value;
		}
		
		private Enum _value;
		/// <summary>
		/// Gets the original enum value.
		/// </summary>
		public Enum Value
		{
			get
			{
				return _value;
			}
		}

		/// <summary>
		/// Returns true if the passed object is another enum-wrapper for the same enum value.
		/// </summary>
		public override bool Equals(object obj)
		{
			if (!(obj is EnumWrapper))
				return false;
		
			EnumWrapper other = (EnumWrapper)obj;
			return Equals(other);
		}
		
		/// <summary>
		/// Returns true if the other enum has the same enum value than this.
		/// </summary>
		public bool Equals(EnumWrapper other)
		{
			return object.Equals(_value, other._value);
		}

		/// <summary>
		/// Gets the hashcode of the enum value or zero if it is null.
		/// </summary>
		public override int GetHashCode()
		{
			if (_value == null)
				return 0;
			
			return _value.GetHashCode();
		}
		
		/// <summary>
		/// Returns the display name of the enum value, or null if it is empty.
		/// </summary>
		public override string ToString()
		{
			if (_value == null)
				return null;
			
			return _value.GetDisplayName();
		}

		/// <summary>
		/// Compares two enum wrappers for equality.
		/// </summary>
		public static bool operator == (EnumWrapper a, EnumWrapper b)
		{
			return a.Equals(b);
		}

		/// <summary>
		/// Compares two enum wrappers for inequality.
		/// </summary>
		public static bool operator != (EnumWrapper a, EnumWrapper b)
		{
			return !a.Equals(b);
		}
	}
}

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

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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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