我矛盾或琐碎的问题是为我创建一个从今天开始的日期列表,格式为DD-MM-YY。假设我们今天是";2015年4月11日";。我想创建一个日期时间列表,该列表正好从2015年11月2日星期一开始到2015年12月8日星期日。这怎么可能?
我最初想:
DateTime today = new DateTime.Now;
int posDayOfWeek = (int)today.DayOfWeek;
if (posDayOfWeek < 7 && posDayOfWeek > 1)
{
// And from there a black hole in my brain ....
}
我怎样才能做到这一点?
假设你总是想要周一到周日,你只需要这样的东西:
DateTime today = DateTime.Today;
int currentDayOfWeek = (int) today.DayOfWeek;
DateTime sunday = today.AddDays(-currentDayOfWeek);
DateTime monday = sunday.AddDays(1);
// If we started on Sunday, we should actually have gone *back*
// 6 days instead of forward 1...
if (currentDayOfWeek == 0)
{
monday = monday.AddDays(-7);
}
var dates = Enumerable.Range(0, 7).Select(days => monday.AddDays(days)).ToList();
只需使用此:
DayOfWeek[] days = {
DayOfWeek.Sunday,
DayOfWeek.Monday,
DayOfWeek.Tuesday,
DayOfWeek.Wednesday,
DayOfWeek.Thursday,
DayOfWeek.Friday,
DayOfWeek.Saturday };
这很简单。很清楚。我已经帮你打好了。
在网上搜索类似的东西,我找到了这个问答线程,并扩展为从昨天开始根据一周中的某一天创建排序顺序:
//create a sort order that starts yesterday
DateTime orderStartDate = DateTime.Today.AddDays(-1);
List<int> sortOrder = Enumerable.Range(0,7).Select(days => (int)orderStartDate.AddDays(days).DayOfWeek).ToList();
//sort collection using the index of the sortOrder
collection.AddRange(list.OrderBy(list => sortOrder.FindIndex(days => day == list.TargetDay)));
简单方法:
Enumerable.Range(0, 7).Select(x => (DayOfWeek)x).ToList()