C#学习系列-out与ref的区别

    class Program
    {
        /*ref是有进有出，out是只出不进*/
        static void Main(string[] args)
        {
            /*作为Out参数传递 传递前可以不初始化*/
            string outString = "This is the  outString value";
            Console.WriteLine(outString);
            outMethod(out outString);
            Console.WriteLine(outString);

            /*作为Ref参数传递 传递前必须初始化*/
            string refString = "This is the refString value";
            Console.WriteLine(refString);
            refMethod(ref refString);
            Console.WriteLine(refString);
            Console.ReadLine();

        }
        static bool outMethod(out string str)
        {
            /*作为Out参数传递 传递到方法体后 参数被清空*/
            //Console.WriteLine(str); Use of unassigned out parameter 'str' 
            /*作为Out参数传递 值必须在方法体内赋值*/
            /*作为Out参数传递 返回前值必须初始化*/
            str = "This is the new outString value";
            return true;
        }
        static bool refMethod(ref string str)
        {
            Console.WriteLine(str);
            /*作为Ref参数传递 返回前值可以不初始化*/
            return true;
        }
    }