获取一个月的天数 [英] Getting number of days in a month

问题描述

我需要知道的是该月份的天数。

  var month = cmbMonth.SelectedIndex + 1; 
 DateTime date = Convert.ToDateTime（month）; 
  

所以如果我用户选择1月，我需要保存31到一个变量。谢谢。

解决方案

你想要 DateTime.DaysInMonth ：

  int days = DateTime.DaysInMonth（year，month）; 
  

显然，它随着年份而变化，因为有时候二月有28天，有时候是29.你可以随时选择一个特别的一年（跳跃或不跳跃）如果你想修复它的一个价值或其他。

I have a comboBox with all the months in it.

What I need to know is the number of days in that month.

var month = cmbMonth.SelectedIndex + 1;
DateTime date = Convert.ToDateTime(month);

So if I user selects January, I need to save 31 to a variable. Thanks.

解决方案

You want DateTime.DaysInMonth:

int days = DateTime.DaysInMonth(year, month);

Obviously it varies by year, as sometimes February has 28 days and sometimes 29. You could always pick a particular year (leap or not) if you want to "fix" it to one value or other.

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