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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011 CPOL
This article will present two alternatives to Lazy.
LazyAlternatives
LazyAlternatives.suo
LazyAlternativesSample
Properties
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 System.ComponentModel;
using System.Globalization;

namespace Pfz.DataTypes
{
	/// <summary>
	/// A converter for the Type.
	/// It converts the type to and from strings.
	/// </summary>
	public class TypeTypeConverter:
		TypeConverter
	{
		/// <summary>
		/// Returns true for strings.
		/// </summary>
		public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
		{
			return sourceType == typeof(string);
		}

		/// <summary>
		/// Returns true for strings.
		/// </summary>
		public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
		{
			return destinationType == typeof(string);
		}
		
		/// <summary>
		/// Gets a type by it's full type name.
		/// </summary>
		public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
		{
			string strValue = value as string;
			return ConvertFrom(strValue);
		}

		/// <summary>
		/// Gets a type by it's full type name.
		/// </summary>
		public static Type ConvertFrom(string value)
		{
			if (string.IsNullOrEmpty(value))
				return null;

			var assemblies = AppDomain.CurrentDomain.GetAssemblies();
			foreach (var assembly in assemblies)
			{
				Type type = assembly.GetType(value, false);
				if (type != null)
					return type;
			}

			throw new ArgumentException("Type " + value + " not found.");
		}
		
		/// <summary>
		/// Gets the full name of a type.
		/// </summary>
		public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
		{
			var recordType = value as Type;
			if (recordType == null)
				return null;
			
			return recordType.FullName;
		}
	}
}

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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 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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