[Design Pattern]Creational Pattern-Singleton Design Pattern(唯一模式)

使用時機:

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使用在必須確保物間的唯一性,例如:多個物件共用一個Connection物件以減少Server的負載,或確保Connection物件的唯一性
使用方式:

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下方程式碼設計為當外部存取SingleTon Class的Instance屬性時,會傳回已存在的實體

public sealed class SingleTon

{

 private static SingleTon _instance = null;

 // Made default constructor as private

 private SingleTon()

 {

 }

 /// <summary>

 /// Single Instance

 /// </summary>

 public static SingleTon Instance

 {

  get

  {

  lock (_instance)

  {

  _instance = _instance ?? new SingleTon();

  return _instance;

  }

 }

}

# region Rest of Implementation Logic

//Add As many method u want here as instance member.No need to make them static

# endregion

}

c#程式碼參考來源:http://www.dotnetfunda.com/articles/article889-design-pattern-implementation-using-csharp.aspx