C#关键字ref和out

using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

namespace Test

{

    class Program

    {

        static void Main(string[] args)

        {

            int a=;

            //ref传参时必须赋值,但方法体内可不不赋值

            RefMethod(ref a);

            Console.WriteLine(a);

            //out传参时可以不赋值,但方法体内必须赋值

            OutMethod(out a);

            Console.WriteLine(a);

        }

        static void RefMethod(ref int a)

        {

            a = ;

        }

        static void OutMethod(out int a)

        {

            a = ;

        }

    }

}