C#私有的构造函数的作用

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C#私有的构造函数的作用:当类的构造函数是私有的时候，也已防止C1 c1=new C1();实例化类。常见的应用是工具类和单例模式。

using System;
using System.Collections.Generic;

namespace NetGraphical
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine(C1.meb1);
            Console.WriteLine("--------------1");
            C1 c1 = new C1();
            Console.WriteLine("--------------2");
            Singleton.getInstance();
        }
    }

    class C1
    {
        public static int meb1 = 10;

        static C1()
        {
            Console.WriteLine("static constructed function:" + meb1);
            meb1 = 20;
        }

        public C1()
        {
            Console.WriteLine("constructed function");
        }
    }

    class Singleton
    {
        private static Singleton s = null;

        private Singleton()
        {
        }

        public static Singleton getInstance()
        {
            if (s == null)
            {
                s = new Singleton();
            }
            return s;
        }
    }
}