public class CBase
    {
        public virtual string PTest
        {
            get { return "base"; }
        }

        public virtual string GetTest()
        {
            return PTest;
        }
    }


    public class CChild : CBase
    {
        public override string PTest
        {
            get { return "child"; }
        }
    }

------解决方案--------------------
修改一下:
       public virtual string GetTest()
       {
           return PTest;
       }
应改为
       public string GetTest()
       {
           return PTest;
       }
GetTest不必做虚函数