兩個項目:第一個：using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Ch10After4{public class MyCopyableClass{protected int myInt;public int ContainedInt{get{return myInt;}set{myInt = value;}}public MyCopyableClass GetCopy(){return (MyCopyableClass)MemberwiseClone();}}}第二個：using System;using System.Collections.Generic;using System.Linq;using System.Text;using Ch10After4;namespace Ch10After4Clinent{class Program{static void Main(string[] args){MyCopyableClass obj1 = new MyCopyableClass();obj1.ContainedInt = 5;MyCopyableClass obj2 = obj1.GetCopy();obj1.ContainedInt = 9;Console.WriteLine(obj2.ContainedInt);}}}運(yùn)行后提示：\Ch10After4\obj\x86\Debug\Ch10After4.exe”不包含適合于入口點的靜態(tài)“Main”方法請問是怎么回事？