反射方法

///利用反射实现动态实例化类，并且调用类的方法和参数

 /// <summary>
        /// 通过函数取出指标数据
///利用反射实现动态实例化类，并且调用类的方法和参数
        /// </summary>
        /// <returns></returns>
        public DataTable FunctionCalc(string dateflag, string cycle, string deptids)
        {
            model.IsStop = "0";

            DataTable dtitem = dalitem.GetList(model).Tables[0];

            DataRow[] dritemid = dtitem.Select("itemfrom ='" + HCMS.Common.Constant.ITEMFROM.FUNCTION + "' and formula is not null");

            string strformula = "";

            string stritemid = "";

            DataTable dt = new DataTable();

            foreach (DataRow item in dritemid)
            {
                stritemid = item["itemid"].ToString();

                strformula = item["formula"].ToString(); //得到数据库存的类名

                object obj;

                Type t;

                t = Type.GetType("MSBLL." + strformula); //得到这个类

                MethodInfo methodInfo = t.GetMethod("CalcWorkLoad"); //得到方法

                ParameterInfo[] paramsInfo = methodInfo.GetParameters();//得到指定方法的参数列表

                int length = paramsInfo.Length; //参数的个数

                object[] count = new object[length]; //定义OBJECT类型的数组

                //给每个参数赋值
                for (int i = 0; i < length; i++)
                {

                    count[i] = "ss";

                }

                object instance = Activator.CreateInstance(t); //把t实例化了

                obj = methodInfo.Invoke(instance, count); //参数必须是OBJECT和OBJECT[]类型

                dt = (DataTable)obj;


                //第二种方法：先反射后接口
                //stritemid = item["itemid"].ToString();

                //strformula = item["formula"].ToString();

                //object obj;

                //Type t;

                //t = Type.GetType("MSBLL." + strformula);

                //obj = Activator.CreateInstance(t);

                //MSBLL.CalFunction.IFunction iclass = (MSBLL.CalFunction.IFunction)obj;

                ////dt = iclass.CalcWorkLoad(stritemid,dateflag, cycle, deptids);


            }

            return dt;
        
        }