Code    private void OnExportPlan(object sender, EventArgs e)        {try            {if (null != ExportPlan)                {                    Cursor = Cursors.WaitCursor;                    saveFileDialog1.Filter = "(Excel2003).xls|*.xls|(Excel2007).xlsx|*.xlsx";if (DialogResult.OK == saveFileDialog1.ShowDialog())                    {                        mExportFilePath = saveFileDialog1.FileName;                        Application.DoEvents();                        ExportPlan(this, null);                    }                }            }finally            {                Cursor =  Cursors.Default;            }        }

Code[STAThread]static void Main() 

Code   Thread  app  =  new  Thread(new  ParameterizedThreadStart(ShowWindow));   app.ApartmentState  =  ApartmentState.STA;

　//也可以　Thread newThread = new Thread(new ThreadStart(ThreadMethod));　newThread.SetApartmentState(ApartmentState.MTA); 

Code static void Main()    {        Thread newThread = new Thread(new ThreadStart(ThreadMethod));        newThread.SetApartmentState(ApartmentState.MTA);

// The following line is ignored since // ApartmentState can only be set once.        newThread.SetApartmentState(ApartmentState.STA);

        Console.WriteLine("ThreadState: {0}, ApartmentState: {1}",             newThread.ThreadState, newThread.ApartmentState);

        newThread.Start();

// Wait for newThread to start and go to sleep.        Thread.Sleep(300);try        {// This causes an exception since newThread is sleeping.            newThread.SetApartmentState(ApartmentState.STA);        }catch(ThreadStateException stateException)        {            Console.WriteLine("\n{0} caught:\n" +"Thread is not in the Unstarted or Running state.",                 stateException.GetType().Name);            Console.WriteLine("ThreadState: {0}, ApartmentState: {1}",                newThread.ThreadState, newThread.GetApartmentState());        }    }

static void ThreadMethod()    {        Thread.Sleep(1000);    }