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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011
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 System.Globalization;

namespace Pfz.DataTypes
{
	/// <summary>
	/// Class that represents a Date without Time.
	/// </summary>
	[Serializable]
	public struct Date:
		IEquatable<Date>,
		IComparable<Date>,
		IComparable
	{
		#region DefaultFormat
			private static string _defaultFormat = "yyyy/MM/dd";
			
			/// <summary>
			/// Gets or sets the default format used to display Date
			/// strings.
			/// </summary>
			public static string DefaultFormat
			{
				get
				{
					return _defaultFormat;
				}
				set
				{
					_defaultFormat = value;
				}
			}
		#endregion
		#region Parse
			/// <summary>
			/// Parses the given text as a Date using the default format.
			/// </summary>
			public static Date Parse(string text)
			{
				DateTime result = DateTime.ParseExact(text, _defaultFormat, CultureInfo.InvariantCulture);
				return (Date)result;
			}
		#endregion
	
		#region Today
			/// <summary>
			/// Gets Today as a Date object.
			/// </summary>
			public static Date Today
			{
				get
				{
					return new Date(DateTime.Today);
				}
			}
		#endregion
	
		#region Constructors
			/// <summary>
			/// Creates a new date by the specified year, month and day.
			/// </summary>
			public Date(int year, int month, int day):
				this(new DateTime(year, month, day))
			{
			}
			
			/// <summary>
			/// Creates a new date from a DateTime. The time information is lost.
			/// </summary>
			public Date(DateTime dateTime)
			{
				_value = dateTime.Year * 10000 + dateTime.Month * 100 + dateTime.Day;
			}
			
			/// <summary>
			/// Creates a Date object from an integer value previously got from
			/// the AsInteger property of another Date.
			/// </summary>
			public Date(int asIntegerValue)
			{
				_value = asIntegerValue;
			}
		#endregion
		
		#region Properties
			/// <summary>
			/// Gets the Year.
			/// </summary>
			public int Year
			{
				get
				{
					return _value / 10000;
				}
			}
			
			/// <summary>
			/// Gets the Month.
			/// </summary>
			public int Month
			{
				get
				{
					return _value / 100 % 100;
				}
			}
			
			/// <summary>
			/// Gets the Day.
			/// </summary>
			public int Day
			{
				get
				{
					return _value % 100;
				}
			}
			
			private int _value;
			/// <summary>
			/// Converts this Date value to an integer representation.
			/// </summary>
			public int AsInteger
			{
				get
				{
					return _value;
				}
			}
		#endregion
		#region Methods
			#region Static comparisons
				/// <summary>
				/// Compares if this two dates are equal.
				/// </summary>
				public static bool operator == (Date date1, Date date2)
				{
					return date1._value == date2._value;
				}
				
				/// <summary>
				/// Compares if two dates are different.
				/// </summary>
				public static bool operator != (Date date1, Date date2)
				{
					return date1._value != date2._value;
				}
				
				/// <summary>
				/// Compares if the first date is less than the second date.
				/// </summary>
				public static bool operator < (Date date1, Date date2)
				{
					return date1._value < date2._value;
				}
				
				/// <summary>
				/// Compares if the first date is greater than the second.
				/// </summary>
				public static bool operator > (Date date1, Date date2)
				{
					return date1._value > date2._value;
				}
				
				/// <summary>
				/// Compares if the first date is less than or equal to the second.
				/// </summary>
				public static bool operator <= (Date date1, Date date2)
				{
					return date1._value <= date2._value;
				}
				
				/// <summary>
				/// Compares if the first date is greater than or equal to the second.
				/// </summary>
				public static bool operator >= (Date date1, Date date2)
				{
					return date1._value >= date2._value;
				}
			#endregion
			#region Implicit and explicit conversions
				/// <summary>
				/// Implicit convertion to DateTime object.
				/// </summary>
				public static implicit operator DateTime(Date date)
				{
					if (date == default(Date))
						return default(DateTime);
				
					return new DateTime(date.Year, date.Month, date.Day);
				}
				
				/// <summary>
				/// Explicit cast from DateTime to Date value.
				/// </summary>
				public static explicit operator Date(DateTime dateTime)
				{
					return new Date(dateTime);
				}
			#endregion
			#region Operator +
				/// <summary>
				/// Returns a new DateTime composed of the given date and time.
				/// </summary>
				public static DateTime operator + (Date date, Time time)
				{
					return new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond);
				}

				/// <summary>
				/// Returns a DateTime composed of this date + time.
				/// </summary>
				public DateTime Add(Time time)
				{
					return this + time;
				}
			#endregion
			
			/// <summary>
			/// Gets the HashCode of the AsInteger value of this date.
			/// </summary>
			public override int GetHashCode()
			{
				return _value.GetHashCode();
			}
			
			/// <summary>
			/// Compares if this Date equals another object.
			/// </summary>
			public override bool Equals(object obj)
			{
				if (obj is Date)
				{
					Date other = (Date)obj;
					return Equals(other);
				}
				
				return base.Equals(obj);
			}
			
			/// <summary>
			/// Returns true if this Date equals another Date.
			/// </summary>
			public bool Equals(Date other)
			{
				return _value == other._value;
			}
			
			/// <summary>
			/// Converts this Date to a string representation.
			/// </summary>
			public override string ToString()
			{
				if (this == default(Date))
					return "";
			
				DateTime dateTime = this;
				return dateTime.ToString(_defaultFormat);
			}
			
			/// <summary>
			/// Compares this date to another date.
			/// </summary>
			public int CompareTo(Date other)
			{
				return _value - other._value;
			}
			
			int IComparable.CompareTo(object obj)
			{
				return CompareTo((Date)obj);
			}
		#endregion
	}
}

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About the Author

Paulo Zemek
Architect
Canada Canada
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.
 
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
Microsoft MVP 2013

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