Question

如果我在dtpWeek1中选择了8/6/2012，我希望下面的代码可以将dtpWeek2移动到8/13，dtpWeek3移动到8/20等等。

但是，无论我在dtp1中选择什么，它都会将dtp2移动到本月的第一天之后的一周（IOW，它始终是第8个）。 DatePickers的其余部分（从dtp3到dtp9）工作正常，因为它们比前一个更长 - 但它们不应该基于我在dtp1中选择的内容，因为它们始终是第15,22和29日（大多数Februarys除外）。

就好像当我移动到另一个月时，DisplayDate变为/ 1 /（这并非完全不合逻辑/令人惊讶），但当我点击该月内的某个特定日期（例如第6个）时，它会忽略它

我使用了错误的活动吗？错误的方法论？

private void dtpWeek1_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
{
    dtpWeek2.DisplayDate = dtpWeek1.DisplayDate.AddDays(7);
    dtpWeek3.DisplayDate = dtpWeek1.DisplayDate.AddDays(14);
    dtpWeek4.DisplayDate = dtpWeek1.DisplayDate.AddDays(21);
    dtpWeek5.DisplayDate = dtpWeek1.DisplayDate.AddDays(28);
    dtpWeek6.DisplayDate = dtpWeek1.DisplayDate.AddDays(35);
    dtpWeek7.DisplayDate = dtpWeek1.DisplayDate.AddDays(42);
    dtpWeek8.DisplayDate = dtpWeek1.DisplayDate.AddDays(49);
    // TODO: Only add week 9 if it is within the month following the first month
    dtpWeek9.DisplayDate = dtpWeek1.DisplayDate.AddDays(56);
}

此外，以编程方式分配了DisplayDates的所有DatePicker组件继续显示“选择日期” - 基于属性名称（DisplayDate），我希望它们实际显示其DisplayDate。他们为什么不呢？我怎样才能让他们真正这样做？如果我点击它们将它们放下，我看到日期是如上所述（第8,15等），但为什么它们会以这种方式隐藏它们的“光”呢？

最后，在旁注中，以这种方式编写代码会产生什么后果（我认为这可能会更慢甚至不可靠）：

private void dtpWeek1_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
{
    dtpWeek2.DisplayDate = dtpWeek1.DisplayDate.AddDays(7);
    dtpWeek3.DisplayDate = dtpWeek2.DisplayDate.AddDays(7);
    dtpWeek4.DisplayDate = dtpWeek3.DisplayDate.AddDays(7);
    dtpWeek5.DisplayDate = dtpWeek4.DisplayDate.AddDays(7);
    dtpWeek6.DisplayDate = dtpWeek5.DisplayDate.AddDays(7);
    dtpWeek7.DisplayDate = dtpWeek6.DisplayDate.AddDays(7);
    dtpWeek8.DisplayDate = dtpWeek7.DisplayDate.AddDays(7);
    dtpWeek9.DisplayDate = dtpWeek8.DisplayDate.AddDays(7);
}

将代码更改为：

    dtpWeek2.SelectedDate = dtpWeek1.DisplayDate.AddDays(7);
    dtpWeek3.SelectedDate = dtpWeek1.DisplayDate.AddDays(14);
    dtpWeek4.SelectedDate = dtpWeek1.DisplayDate.AddDays(21);
    dtpWeek5.SelectedDate = dtpWeek1.DisplayDate.AddDays(28);
    dtpWeek6.SelectedDate = dtpWeek1.DisplayDate.AddDays(35);
    dtpWeek7.SelectedDate = dtpWeek1.DisplayDate.AddDays(42);
    dtpWeek8.SelectedDate = dtpWeek1.DisplayDate.AddDays(49);
    dtpWeek9.SelectedDate = dtpWeek1.DisplayDate.AddDays(56);

解决了未显示日期的问题。然而，他们仍然表现得好像我选择了8/1而不是8/6。值为：

8/6
8/8
8/15
8/22
8/29
etc.

Answer 1

好的，将评论转换为答案：SelectedDate属性应该像这样使用：

dtpWeek2.SelectedDate = dtpWeek1.SelectedDate.Value.AddDays(7);

SelectedDate是DateTime?（可空），因此右侧是.Value。

DatePicker的DisplayDates未正确更新，并且不显示其新值

1 个答案: