DLL程序代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DataLogic
{
    public partial class Form1 : Form
    {
        public static IList<string> strlist =new List<string>();

        public static string va = "";

        public Form1()
        {
            InitializeComponent();
        }

        public void StartLink()
        {
            for (int i = 1; i < 10; i++)
            {
                axRFNCCTL1.Devices.Add(i);
            }

            axRFNCCTL1.CommPort = "COM4";
            axRFNCCTL1.BaudRate = "38400";
            axRFNCCTL1.OpenLine();
            axRFNCCTL1.SetLostFrameBehaviour(true, 1, 2);

            axRFNCCTL1.Satellites.Add(2);
            axRFNCCTL1.Satellites.get_Satellite(2).Alive();

            TBStarLink.Text = Convert.ToDateTime(DateTime.Now).ToShortTimeString();

            axRFNCCTL1.OpenNetwork();
        }

        public void OpenLink()
        {
            axRFNCCTL1.CloseNetwork();
        }

       
        /// <summary>
        /// 扫描枪发送接收事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void axRFNCCTL1_DataEvent(object sender, AxNRFCCTLCONTROLLib._IRFNCCTLEvents_DataEventEvent e)
        {

            string a = axRFNCCTL1.Devices.get_Device(e.devID).DeviceData.ToString();

            setArray(a);

            axRFNCCTL1.Devices.get_Device(e.devID).DataWrite(a + result, (short)(a.Length + a.Length));

   
           
        }

        /// <summary>
        /// 扫描枪连接事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void axRFNCCTL1_AliveEvent(object sender, AxNRFCCTLCONTROLLib._IRFNCCTLEvents_AliveEventEvent e)
        {
            TBStarLink.Text = "连接AP成功!";
        }

         public bool setArray(string str)
        {
            strlist.Add(str);
            return true;
        }
        
        public static string getArray()
        {
          
            foreach (string str in strlist)
            {
                va += str + "*";
            }
            strlist.Clear();
                        
                return va;
        }
}

主程序代码（动态调用DLL）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Reflection;

namespace Test
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private object Invoke(string lpFileName, string Namespace, string ClassName, string lpProcName)
        {
            try
            { // 载入程序集
                Assembly MyAssembly = Assembly.LoadFrom(lpFileName);
                Type[] type = MyAssembly.GetTypes();
                foreach (Type t in type)
                {// 查找要调用的命名空间及类
                    if (t.Namespace == Namespace && t.Name == ClassName)
                    {// 查找要调用的方法并进行调用
                        MethodInfo m = t.GetMethod(lpProcName);
                        if (m != null)
                        {
                            object o = Activator.CreateInstance(t);

                            //string s = (string)m.Invoke(o, null);
                            return m.Invoke(o,null);
                        }
                        else MessageBox.Show(" 装载出错 !");
                    }
                }
            }//try
            catch (System.NullReferenceException e)
            {
                MessageBox.Show(e.Message);
            }//catch
            return (object)0;
        }

/// <summary>
        /// 取数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(Invoke("DataLogic.exe", "DataLogic", "Form1", "getArray").ToString());
        }

        /// <summary>
        /// 启动扫描枪
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            Invoke("DataLogic.exe", "DataLogic", "Form1", "StartLink");
        }

        /// <summary>
        /// 关闭扫描枪
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            Invoke("DataLogic.exe", "DataLogic", "Form1", "OpenLink");
        }

    }
}

首先我点击button2_Click启动扫描枪，然后使用扫描枪扫条码，这是DLL的axRFNCCTL1_DataEvent事件会触发接收数据并调用setArray（）方法存储数据，这是strlist已有数据，我点击button3_Click取数据，取到扫的条码数据。但这时我再扫条码axRFNCCTL1_DataEvent事件就不触发了，我不知道为什么，一但我点击button3_Click事件就再不能扫描，axRFNCCTL1_DataEvent事件也就不会触发了，我郁闷了！~不知道为什么

如果我不button3_Click，就一直可以扫描，axRFNCCTL1_DataEvent事件也一直触发。

大家帮我想想为什么，好奇怪啊！！！！！！！