[STAThread]

        static void Main()

        {

            Application.EnableVisualStyles();

            Application.SetCompatibleTextRenderingDefault(false);

            Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);

            //首先打开登陆窗体,登陆成功后初始化MDI主窗体

            if (frmLogin.Login())

            {

                frmMain.CurrentMainForm.Show();//显示主窗体

                Application.Run();

            }

            else//登录失败,退出程序

                Application.Exit();

        }

private void btnLogin_Click(object sender, EventArgs e)

        {

            try

            {

                if (false == this.ValidateInput()) return;

                this.Cursor = Cursors.WaitCursor;

                this.SetButtonEnable(false);

                this.Update();//必须

                this.ShowLoginInfo("正在验证用户名及密码");

                if (SystemSecure.Login(txtUID.Text, txtPWD.Text)) //调用系统安全管理模块登录方法

                {

                    //

                    //授权成功, 下载用户权限数据.....

                    //

                    //登录成功，初始化主窗体，初始化进度在登录窗体的状态栏显示

                    IMainForm MDI = frmMain.CreateMainFormInsatance();

                    //MDI.InitUserInterface(new StatusBarMessage(lblLoading));

                    MDI.InitUserInterface(new LabelMessage(label3));

                    this.DialogResult = DialogResult.OK; //成功

                    this.Close(); //关闭登陆窗体

                }

                else

                {

                    this.ShowLoginInfo("登录失败，请检查用户名和密码!");

                    Msg.Warning("登录失败，请检查用户名和密码!");

                }

            }

            catch

            {

                this.SetButtonEnable(true);

                this.ShowLoginInfo("登录失败，请检查用户名和密码!");

                Msg.Warning("登录失败，请检查用户名和密码!");

            }

            this.Cursor = Cursors.Default;

        }

public void InitUserInterface(IMsg status)

        {

            //

            //在这里初始化主窗体，如：加载模块，生成菜单，下载公共缓存数据等操作...

            //

            try

            {

                this.SuspendLayout();

                status.ShowMessage("正在初始化用户界面...");

                status.ShowMessage("正在加载模块...");

                status.ShowMessage("正在生成菜单...");

                status.ShowMessage("正在下载公共缓存数据...");

                status.ShowMessage("加载主窗体完成.");

                this.ResumeLayout();

            }

            catch (Exception ex)

            { Msg.ShowException(ex); }

        }

private void menuLogout_Click(object sender, EventArgs e)

        {

            if (!Application.AllowQuit) return; //程序不允许退出

            if (!Msg.AskQuestion("真的要登出吗?")) return;

            try

            {

                if (this.AnyDataChanged())

                {

                    Msg.Warning("系统检测到有数据窗体没有保存，不能登出!");

                    return;

                }

                this.Hide();

                if (frmLogin.Login())

                {

                    frmMain.DisposeOldForm();//关闭旧的主窗体，释放内存

                    frmMain.CurrentMainForm.Show();//显示登录窗体               

                }

                GC.Collect();

            }

            catch (Exception ex)

            {

                Msg.ShowException(ex);

            }

        }