1.靜態代碼塊

/// <summary>/// 靜態代碼塊/// 僅在第一次調用類的任何成員時自動執行/// </summary>public class SingletonStatic{private static readonly SingletonStatic _instance =null;static SingletonStatic(){_instance = new SingletonStatic();}private SingletonStatic(){}public static SingletonStatic Instance{get { return _instance; }}}

2.內部類

/// <summary>/// 內部類/// </summary>public class SingletonInner{private SingletonInner(){}public static SingletonInner Instance{get{ return InnerClass.inner; }}private class InnerClass{internal static readonly SingletonInner inner = new SingletonInner();}}

3.Lazy

/// <summary>/// Lazy單例/// </summary>public class SingletonLazy{private static readonly SingletonLazy _instance = new Lazy<SingletonLazy>().Value;private SingletonLazy(){}public SingletonLazy Instance{get { return _instance; }}}

4.單例模式基類(轉自https://www.cnblogs.com/zhouzl/archive/2019/04/11/10687909.html)

/// <summary>/// https://www.cnblogs.com/zhouzl/archive/2019/04/11/10687909.html/// </summary>/// <typeparam name="T"></typeparam>public abstract class Singleton<T> where T : class{// 這里采用實現5的方案，實際可采用上述任意一種方案class Nested{// 創建模板類實例，參數2設為true表示支持私有構造函數internal static readonly T instance = Activator.CreateInstance(typeof(T), true) as T;}private static T instance = null;public static T Instance { get { return Nested.instance; } }}class TestSingleton : Singleton<TestSingleton>{// 將構造函數私有化，防止外部通過new創建private TestSingleton() { }}

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轉載于:https://www.cnblogs.com/NNYang/p/11013533.html

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