[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