单件模式

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//普通单件模式

namespace DesignMode
{
    public class Singleton
    {
        private static Singleton instance;

private Singleton()
{

}

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

}
}

多线程单件模式

public class Singleton2
    {
        //単件モード
        private static Singleton2 instance;

        private static object _lock = new object();

        private Singleton2()
        {

        }

        public static Singleton2 CreateInstance()
        {
            if (instance == null)
            {
                lock (_lock)
                {
                    if (instance == null)
                    {
                        instance = new Singleton2();
                    }
                }
            }
            return instance;
        }
    }

其它单件模式

public class Singleton3
{

private static readonly Singleton3 instance = new Singleton3();

        private Singleton3()
        {
        }

        public static Singleton3 CreateInstance()
        {
            return instance;
        }

}

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