Question

我有一些按钮的WPF应用程序。一个按钮名为ChangeTime，因此单击该对话框会打开，您可以更改hh / mm / ss。我想将选择的时间存储在变量中。

我的问题是，如果用户确实更改了时间，我只想存储该新时间。当前，当用户按下按钮时，事件触发和新值被存储。同样，在不触摸“时间”字段的情况下关闭对话框时，也不应存储新值。

基本上，我想在实际更改时间时将BtnWasClicked更改为true。变量名称的选择确实很差。

有什么预防方法吗？

private DateTimePicker _timePortionDateTimePicker;
private DateTime _pickedTime;
private bool btnWasClicked = false;
private bool timeChanged = false;

private void TimeIsChanged(object sender, EventArgs e)
{
  timeChanged = true;
  if (timeChanged)
  {
    btnWasClicked = true;
  }
}

private void BtnChangeTime_OnClick(object sender, EventArgs e)
{
  Form timeDialog = new Form();

  _timePortionDateTimePicker = new DateTimePicker();
  _timePortionDateTimePicker.Format = DateTimePickerFormat.Time;
  _timePortionDateTimePicker.ShowUpDown = true;
  _timePortionDateTimePicker.ValueChanged += new 
                                             EventHandler(TimeIsChanged);

  timeDialog.Controls.Add(_timePortionDateTimePicker);
  timeDialog.ShowDialog();

  _pickedTime = _timePortionDateTimePicker.Value;
}

Answer 1

您实际上并不需要TimeIsChanged。您只需检查_timePortionDateTimePicker.Value与_pickedTime中的BtnChangeTime_OnClick是否不同。

  Form timeDialog = new Form();

  _timePortionDateTimePicker = new DateTimePicker();
  _timePortionDateTimePicker.Format = DateTimePickerFormat.Time;
  _timePortionDateTimePicker.ShowUpDown = true;
  // start with the previous chosen time
  _timePortionDateTimePicker.Value = _pickedTime;

  timeDialog.Controls.Add(_timePortionDateTimePicker);
  timeDialog.ShowDialog();

  if (_pickedTime != _timePortionDateTimePicker.Value) {
      // time has changed, assign to _pickedTime and other variables
      _pickedTime != _timePortionDateTimePicker.Value;
      timeChanged = true;
      btnWasClicked = true;
  } // otherwise do nothing

在DateTimePicker

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