C#小筆記：單例模式

雙重鎖定：

public class Singleton
{
    private static Singleton instance;
    private static readonly object syncRoot = new object();
    private Singleton()
    {}

    public static Singleton GetInstance()
    {
        if(instance == null)
        {
            lock(syncRoot)
            {
                if(instance == null)
                {
                    instance = new Singleton();
                }
            }
        }
        return instance;
     }

    //Operation funtion()
}      

靜态初始化：

public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();
    private Singleton(){}
    public static Singleton GetInstance()
    {
        return instance;
    }

    //Operation funtion()
}      

更多資訊請參考：大話設計模式！