当您使用Calendar控件asp.net c＃在日历中选择星期一时，如何显示所有星期一

Question

protected void Button1_Click1(object sender, EventArgs e)
{

    DateTime dtime1 = new DateTime();
    dtime1 = Calendar1.SelectedDate;

    DateTime dtime = new DateTime();
    dtime = dtime1.AddDays(7);
    Response.Write(dtime.ToString("dd/MM/yyyy") + "</br>");
}

I need to display all the Mondays when i select Monday of the current month. Should i use bool? I have to code using loop concepts.

Answer 1

DateTime dtime1 = Calendar1.SelectedDate;         

int iTotalDays = DateTime.DaysInMonth(dtime1.Year, dtime1.Month) - dtime1.Day;

for (int i = 1; i <= iTotalDays; i++)
{
  var d = dtime1.AddDays(i);
  if (d.DayOfWeek == DayOfWeek.Monday) 
       Response.Write(d.ToString("dd/MM/yyyy") + "</br>");
}

UPDATE :

All mondays of current month:

DateTime dtime1 = DateTime.Now;       

int iTotalDays = DateTime.DaysInMonth(dtime1.Year, dtime1.Month);

for (int i = 1; i <= iTotalDays; i++)
{
    var d = new DateTime(dtime1.Year, dtime1.Month, i);
    if (d.DayOfWeek == DayOfWeek.Monday)          
        Response.Write(d.ToString("dd/MM/yyyy") + "</br>");
}

Answer 2

I think the following code should help you in displaying all the Mondays of a particular month.

protected void Button1_Click1(object sender, EventArgs e) {

    DateTime dtime1 = new DateTime();
    dtime1 = Calendar1.SelectedDate;
    // get a list of all dates
    var dates = Enumerable.Range(1, DateTime.DaysInMonth(dtime1.Year, dtime1.Month)).Select(n => new DateTime(dtime1.Year, dtime1.Month, n));
    // then filter mondays like following
    var mondays = from d in dates
                   where d.DayOfWeek == DayOfWeek.Monday
                   select d;
    List<DateTime> listOfMondays = mondays.ToList();
    // then you can loop through the listOfMondays and write it on the response.

}