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如果我在 dtpWeek1 中选择 8/6/2012，我希望下面的代码将 dtpWeek2 移动到 8/13，将 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 移动到该月的第一天之后的一周（IOW，它始终是 8 号）。其余的 DatePickers（从 dtp3 到 dtp9）工作正常，因为它们比前一个多一周 - 但不是基于我在 dtp1 中选择的内容，因为它们始终是第 15、22 和29 日（大多数二月除外）。

就好像当我移到另一个月份时 DisplayDate 更改为 /1/ （这并非完全不合逻辑/令人惊讶），但是当我然后单击该月内的特定日期（例如 6 日）时，它会忽略它。

我使用了错误的事件吗？方法论错误？

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，以编程方式分配其 DisplayDate 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它们的 DisplayDate。他们为什么不呢？我怎样才能让他们真正这样做？如果我单击它们将它们放下，我会看到上面描述的日期（8 日、15 日等），但他们为什么要这样隐藏他们的“光”呢？

最后，附带说明一下，以这种方式编写代码的后果是什么（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);

解决了日期不显示的问题。但是，他们仍然表现得好像我选择了 8/1 而不是 8/6。这些值为：

8/6
8/8
8/15
8/22
8/29
etc.
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1 回答 1

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好的，将评论变成答案：该SelectedDate属性应该像这样使用：

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

SelectedDate是DateTime?（可为空的），因此.Value在右侧。

于 2012-07-09T21:36:00.550 回答