在專案開發過程中，經常會涉及到多個採用單例模式的類，對每個類都要進行單例的處理，甚是不爽。

下面使用泛型類解決了這個問題，只要簡單繼承就可以了，程式碼如下：

namespace LogHelper
{
    using System;

    /// <summary>
    /// generic for singletons
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Singleton<T> where T : new()
    {
        protected Singleton()
        {
            if (Instance != null)
            {
                throw (new Exception("You have tried to create a new singleton class where you should have instanced it. Replace your \"new class()\" with \"class.Instance\""));
            }
        }

        public static T Instance
        {
            get
            {
                return SingletonCreator.instance;
            }
        }

        class SingletonCreator
        {
            static SingletonCreator()
            {

            }
            internal static readonly T instance = new T();
        }
    }
}




    
 

//繼承單例類
namespace LogHelper
{
    class HelperClass : Singleton<HelperClass>
    {
        public HelperClass() { }

        public double Add(double a, double b)
        {
            return a + b;
        }
    }
}

呼叫方法：

HelperClass.Instance.Add(1,2);