foreach day in month [duplicate]

Answer 1

You can do it with a simple loop:

DateTime first = new DateTime(2012, 1, 1);
for (DateTime current = first ; current.Month == first.Month ; current = current.AddDays(1)) {
}

Answer 2

It is fairly easy to generate an enumeration of days. Here is one way to do it

Enumerable.Range(1, DateTime.DaysInMonth(year, month)).Select(day =>
    new DateTime(year, month, day))

Answer 3

Try using a for loop instead.

for (int i = 1; i <= DateTime.DaysInMonth(year, month); i++)
{
  DateTime dt = new DateTime(year, month, i);
}

Answer 4

You can write a helper method pretty easily:

public static IEnumerable<DateTime> AllDatesInMonth(int year, int month)
{
    int days = DateTime.DaysInMonth(year, month);
    for (int day = 1; day <= days; day++)
    {
         yield return new DateTime(year, month, day);
    }
}

Then call it with:

foreach (DateTime date in AllDatesInMonth(2012, 1))

This is probably overkill for something you're only doing once, but it's much nicer than using a for loop or something similar if you're doing this a lot. It makes your code say just what you want to achieve, rather than the mechanics for how you're doing it.

Answer 5

You can use Range:

Enumerable
    .Range(1, DateTime.DayInMonth(2012, 1)
    .Select(i => new DateTime(2012, 1, i)))
    .ToList() // ForEach is not a Linq to Sql method (thanks @Markus Jarderot)
    .ForEach(day => Console.Write(day));