本人想通过反射技术动态加载dll来执行方法并取引用类型参数的值。下面是我的代码：

MYService.dll中存在函数GetDataTable  原型：

public int GetDataTable(string SQLCommand, ref DataTable Result);

本人想通过反射动态加载MYService.dll，来执行GetDataTable 并获取 DataTable Result 中的ref 返回的值，但我每次执行都返回了空对象？是否应该用指针去做，还是有别的方法？请各位大大指点迷津！！跪谢！

贴完整代码如下：

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Reflection;
using System.IO;
using System.Data;
using System.Text;
using System.Data.SqlClient;

namespace TEST
｛
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {

            
            Program.INITAPP();

        }

        private static  void INITAPP()
        {
      
            DataTable dt = new DataTable();

            object[] paramArray = new object[] { "select * from xxxx",dt }; //传递的参数
   

            Type[] paramTypes = new Type[2];
            paramTypes[0] = Type.GetType("System.String");
            paramTypes[1] = Type.GetType("System.Data.DataTable&,System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");

            try
            {

                Assembly assm = Assembly.LoadFrom(Application.StartupPath + @"\MYService.dll");
                Type objType = assm.GetType("com.MYService.TableService",true);
                object objInstance = Activator.CreateInstance(objType, true);
              
                MethodInfo mi = objType.GetMethod(
                    "GetDataTable",
                    BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.Instance,
                    null,
                    paramTypes,
                    null
                    );
                //返回空对象
               
               // MethodInfo mi = objType.GetMethod("GetDataTable",paramTypes);

                if (mi != null)
                {
         
           
                    object result = mi.Invoke(objInstance,paramArray);
                    DataTable rs = (DataTable)paramArray[1];//需要取回的结果，但现在老为空，不知道啥原因
                    
                }

                
            }
            catch (Exception e)
            {

                MessageBox.Show(e.Message+"\n\n"+e.StackTrace);
            }
 
        }

    }
}