private void Tree_AfterExpand(object sender, TreeViewEventArgs e)
        {
            int FileID = int.Parse(((ListItem)comboxFile.Items[comboxFile.SelectedIndex]).ID);
            BackgroundWorker bw = new BackgroundWorker();
            bw.DoWork += new DoWorkEventHandler(bw_DoWork);
            bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);

            object[] oArgs = new object[] { e.Node, FileID };
            bw.RunWorkerAsync(oArgs);
            bomTree.SelectedNode = e.Node;
        }

 public class PlugingManager
    {
        //插件装载器
        public ArrayList Plugins = new ArrayList();
        //插件FullName
        public ArrayList PlugFullName = new ArrayList();
        //插件类型
        public ArrayList PlugTypes = new ArrayList();

        #region 构造函数
        /// <summary>
        /// PlugingManager插件加载
        /// </summary>
        /// <param name="plugspath">插件所在目录必须是运行目录中的文件夹</param>
        /// <param name="StartsWith">加载指定插件（插件包含的名称）</param>
        /// <param name="InterfaceName">插件接口名称</param>
        public PlugingManager(string plugspath,string StartsWith,string InterfaceName)
        {
            //获取插件目录(plugins)下所有文件
            string[] files = Directory.GetFiles(Application.StartupPath + @"\\" + plugspath);
           
            foreach (string file in files)
            {
                if (file.ToUpper().EndsWith(StartsWith.ToUpper()))
                {
                    try
                    {
                        //Assembly ab = Assembly.LoadFrom(file);
                        Assembly ab = null;

                        //先将插件拷贝到内存缓冲
                        byte[] addinStream = null;
                        using(FileStream input = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read))
                        {
                            BinaryReader reader = new BinaryReader(input);
                            addinStream = reader.ReadBytes((int) input.Length);

                        }
                        ab = Assembly.Load(addinStream); //加载内存中的Dll
                        Type[] types = ab.GetTypes();
                        foreach (Type t in types)
                        {
                            if (t.GetInterface(InterfaceName) != null)
                            {
                                Plugins.Add(ab.CreateInstance(t.FullName));
                                PlugFullName.Add(t.FullName);
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }
        #endregion
    }

[DllImport("kernel32.dll")]
static extern IntPtr GetConsoleWindow();