设置 DateTimePicker 仅在定时操作触发时关闭应用程序

发布于 2024-12-21 19:52:54 字数 783 浏览 1 评论 0原文

我在 C# 中有一个函数，它首先将 GUI DateTimePicker 对象的值设置为今天的日期（时间 = 午夜），然后执行其他操作。当通过 GUI 按钮执行时，函数 (DBIO_Morning) 运行良好。但是，通过定时操作执行：

private void SetupTimedActions()
{
   ...

   DateTime ref_morning = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 8, 16, 0);
   if (DateTime.Now < ref_morning)
      At.Do(() => DBIO_Morning(), ref_morning);
   ...
}

它在第二行失败：(

private void DBIO_Morning()
{
   DateTime date_current = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 0, 0, 0);
   DTPicker_start.Value = date_current;
   ...
}

At.Do 对象来自此处的第三个答案： C# 在 X 秒后执行操作 )

原文

I have a function in C# which, at the outset, sets the value of a GUI DateTimePicker object to today's date (time = midnight), then does other stuff. When executed via GUI button, the function (DBIO_Morning) runs fine. But, executed via timed action:

private void SetupTimedActions()
{
   ...

   DateTime ref_morning = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 8, 16, 0);
   if (DateTime.Now < ref_morning)
      At.Do(() => DBIO_Morning(), ref_morning);
   ...
}

it fails in the second line:

private void DBIO_Morning()
{
   DateTime date_current = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 0, 0, 0);
   DTPicker_start.Value = date_current;
   ...
}

( At.Do object is from the third answer here: C# execute action after X seconds )

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别挽留 2024-12-28 19:52:54

控件不是线程安全的，这意味着您不能从另一个线程调用控件的方法。您可以等待，直到控件的线程准备好使用 Control.Invoke 处理您的操作：

private void DBIO_Morning()
{
    DateTime date_current = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 0, 0, 0);
    Action setValue = () => DTPicker_start.Value = date_current;
    if (DTPicker_start.InvokeRequired)
        DTPicker_start.Invoke(setValue);
    else
        setValue();
}

Controls are not thread-safe, meaning you must not call a control's methods from another thread. You can wait until the control's thread is ready to handle your action using Control.Invoke:

private void DBIO_Morning()
{
    DateTime date_current = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 0, 0, 0);
    Action setValue = () => DTPicker_start.Value = date_current;
    if (DTPicker_start.InvokeRequired)
        DTPicker_start.Invoke(setValue);
    else
        setValue();
}

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