在创建窗口句柄之前,不能在控件上调用 Invoke 或 BeginInvoke。

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public partial class UCInfo : UserControl     {         public UCInfo()         {             InitializeComponent();                      }         ManualResetEvent neverSetEvt = new ManualResetEvent(false);         delegate void InvokeDelegate();         public void SetInfo(string info)         {             lblInfo.Invoke(new InvokeDelegate(() => { lblInfo.ForeColor = Color.Green; }), null);             lblInfo.Invoke(new InvokeDelegate(() => { lblInfo.Text = info; }), null);             ThreadPool.RegisterWaitForSingleObject(neverSetEvt, (obj, bol) =>                 {                     if (lblInfo.IsHandleCreated)                     {                         lblInfo.Invoke(new InvokeDelegate(() => { lblInfo.Text = ""; }), null);                     }                 }, null, 600000, true);         }         public void SetInfo(string info, Color color)         {             lblInfo.Invoke(new InvokeDelegate(() => { lblInfo.ForeColor = color; }), null);             lblInfo.Invoke(new InvokeDelegate(() => { lblInfo.Text = info; }), null);             ThreadPool.RegisterWaitForSingleObject(neverSetEvt, (obj, bol) =>             {                 if (lblInfo.IsHandleCreated)                 {                     lblInfo.Invoke(new InvokeDelegate(() => { lblInfo.Text = ""; }), null);                 }             }, null, 600000, true);         }     }<br><br>当调试运行中突然关闭软件时，lblInfo.Invoke(labchange);语句就出先了“在创建窗口句柄之前,不能在控件上调用 Invoke 或 BeginInvoke。”错误。<br>解决办法是在lblInfo.Invoke(labchange);前加一个if(lblInfo.IsHandleCreated)判断就可以了