原 利用Appdomain动态加载程序集，

    public interface FuncProcessings 
    { 
        void GetFunctionMessage(FuncMessage funcMessage);
        string ReturnResult();
    }
    [Serializable]
   public struct FuncMessage
    {
        private string projectMessage;
        private string _head;
        private string _body;
        private string _foot;

        public string Head { get { return _head; } set { _head = value; } }
        public string Body { get { return _body; } set { _body = value; } }
        public string Foot { get { return _foot; } set { _foot = value; } }
        public string ProjectMessage { get { return projectMessage; } set { projectMessage = value;     }

public class Processing : MarshalByRefObject, ProcessingInterface.FuncProcessings
    {
        public Processing()
        { }
        public void GetFunctionMessage(FuncMessage funcMessage)
        {
            string basePath = string.Empty;
            string activingFile = string.Empty;
            string selectedTest = string.Empty;
            string[] projrctStr = funcMessage.ProjectMessage.Split('$');
            if (projrctStr.Length < 3)
            {
                basePath = projrctStr[0];
                activingFile = projrctStr[1];
            }
            if (projrctStr.Length < 4)
            {
                selectedTest = projrctStr[2];
            }
            string message = string.Format("----工程名----\r\n{0}\r\n----激活文件----\r\n{1}\r\n----已选文本----\r\n{2}\r\n----程序头部----\r\n{3}\r\n----函数----\r\n{4}\r\n----程序结尾----\r\n",
                              basePath,
                              activingFile,
                              selectedTest,
                              funcMessage.Head.Replace(" ", ""),
                              funcMessage.Body.Replace(" ", ""),
                              funcMessage.Foot.Replace(" ", ""));
            GlobalVariables.functionString = message;

        }
        public string ReturnResult()
        {
            return GlobalVariables.functionString;
        }
    }

  if (_applicationObject != null)
            {
                string projectmess = _applicationObject.ActiveWindow.Project.FullName + '$'                          //项目名称
                                     + _applicationObject.ActiveDocument.FullName.Trim() + "$"                        //文件
                                     + ((TextSelection)_applicationObject.ActiveDocument.Selection).Text.Trim();     //被选文本

                string appPath = @"C:\Users\Administrator\Desktop\work";
                string assemblyPath = @"D:\我的文档\Visual Studio 2012\Projects\FuncTest\FuncTest\bin\Debug\AddFunc.dll";


                FuncMessage funcMessage = new FuncMessage();
                funcMessage.ProjectMessage = projectmess;
                funcMessage.Head = this.HeaderText.Text.Trim();
                funcMessage.Body = this.BodyText.Text.Trim();
                funcMessage.Foot = this.FootText.Text.Trim();

                AppDomainSetup setup = new AppDomainSetup();
                setup.ApplicationName = "ModelLoad";
                setup.ApplicationBase = appPath;// AppDomain.CurrentDomain.BaseDirectory;
                setup.PrivateBinPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "private");
                setup.CachePath = setup.ApplicationBase;
                setup.ShadowCopyFiles = "true";
                setup.ShadowCopyDirectories = setup.ApplicationBase;
                appDomain = AppDomain.CreateDomain("ModelLoadDomain", null, setup);
                string name = Assembly.LoadFrom(assemblyPath).GetName().FullName;

                IFunc = (FuncProcessings)appDomain.CreateInstanceAndUnwrap(
                name,
                typeof(Processing).FullName);

                IFunc.GetFunctionMessage(funcMessage);
                ResultForm rf = new ResultForm(IFunc.ReturnResult());
                rf.ShowDialog();
                }

 setup.ApplicationBase = appPath;// AppDomain.CurrentDomain.BaseDirectory;