Value Dispose() cannot be called while doing CreateHandle().

在backgroundWorker run之前show出了一个窗体_frm.

_frmpw = new FrmPleaseWait();
_frmpw.SetMsg("正在请求");
_frmpw.Show();

bw.RunWorkerAsync();

在backgroundWorker RunWorkerCompleted事件中准备去关闭这个窗口

private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (_frmpw != null && !_frmpw.IsDisposed)
_frmpw.Close();

。

如果DoWork事件中的任务完成的非常快，_frmpw还未创建完成时就去访问_frmpw.IsDisposed属性就会出现Value Dispose() cannot be called while doing CreateHandle().

解决方法，只能在DoWork事件中加SLEEP了。

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
System.Threading.Thread.Sleep(300);//防止Value Dispose() cannot be called while doing CreateHandle()

-----------