如果
public struct JyotyoJyohou_M
        {
            public decimal dcMkg0; 
            public decimal dcMkg1;
            public decimal dcMkg2;
            public void InitstJyotyoM()
            {
                dcMkg0 = 0;
dcMkg1 = 0;dcMkg1 = 0;            }
        }public decimal[] GSJMdcMkg0;        public decimal[] GSJMdcMkg0
        {
            get
            {
                return stJyotyoM[a].dcMkg0;
            }
            set
            { 
            
            }
        }上面的代码在类c中
c cc=new c();
c.GSJMdcMkg0[a]=12;我在调用GSJMdcMkg0时怎样把a,传进来?怎么办?新手