如何用天、月和年填充组合框？

Question

I have 3 comboboxes. 1st: days , 2nd: months , 3rd: years . I would like to fill the combobox with the correct days, i think leap year...

for (int i = 1; i <= 12; i++)
{
comboBoxDays.Items.Add(i);
} 

for (int i = DateTime.Now.Year; i <= 2050; i++)
{
 comboBox1Month.Items.Add(i);
}

How I fill the days with correct numbers? If the year is a leap year.

Answer 1

有一个DateTime.DaysInMonth方法可以为您提供特定月份的天数，即使是闰年。

Answer 2

Try this

int year = 2019;
int month = 4;

int[] days = Enumerable.Range(1, DateTime.DaysInMonth(year, month)).ToArray();
int[] years = Enumerable.Range(DateTime.Now.Year, 2050).ToArray();
string[] months = new string[]{"Jan","Feb","Mar","..."};

comboBoxDays.DataSource = days;
comboBoxDays.DataBind();

comboBoxYears.DataSource = years;
comboBoxYears.DataBind();

comboBox1Month.DataSource = months;
comboBox1Month.DataBind();