asp.net - DateA と DateB の間のすべての日付を取得する最良の方法

Question

asp:Calander を使用しています。開始日と終了日を持つオブジェクトがあります。これら 2 つの日付の間のすべての日付を取得して配列に配置する必要があるため、対応する日付を異なる CSS でカレンダーにレンダリングできます。

Answer 1

DateTime startDate;
DateTime endDate;

DateTime currentDate = startDate;
List<DateTime> dates = new List<DateTime> ();

while (true)
{
    dates.Add (currentDate);
    if (currentDate.Equals (endDate)) break;
    currentDate = currentDate.AddDays (1);
}

startDate < endDate であると仮定すると、「dates」リストで結果が得られます

Answer 2

IEnumerable<DateTime> RangeDays(DateTime RangeStart, DateTime RangeEnd) {
   DateTime EndDate = RangeEnd.Date;

   for (DateTime WorkDate = RangeStart.Date; WorkDate <= EndDate; WorkDate = WorkDate.AddDays(1)) {
      yield return WorkDate;
   }

   yield break;
}

Untested code... but should work.

Answer 3

// inclusive
var allDates = Enumerable.Range(0, (endDate - startDate).Days + 1).Select(i => startDate.AddDays(i));

// exclusive
var allDates = Enumerable.Range(1, (endDate - startDate).Days).Select(i => startDate.AddDays(i));

Answer 4

I voted up AlbertEin because he gave a good answer, but do you really need a collection to hold all the dates? When you are rendering the day, couldn't you just check if the date is withing the specified range, and then render it differently, no need for a collection. Here's some code to demonstrate

DateTime RangeStartDate,RangeEndDate; //Init as necessary
DateTime CalendarStartDate,CalendarEndDate; //Init as necessary
DateTime CurrentDate = CalendarStartDate;

String CSSClass;

while (CurrentDate != CalendarEndDate)
{
    if(CurrentDate >= RangeStartDate && CurrentDate <= RangeEndDate)
    {
        CSSClass= "InRange";
    }     
    else
    {
        CSSClass = "OutOfRange";
    }
    //Code For rendering calendar goes here
    currentDate = currentDate.AddDays (1);
}