如何获取所有日期在一个给定的月份在C＃ [英] How to get All Dates in a given month in C#

问题描述

我想制作一个月份和年份的函数，并返回列表< DateTime> ，填充本月所有日期。

I want to make a function that take month and year and return List<DateTime> filled with all dates in this month.

任何帮助将不胜感激

感谢提前

推荐答案

这是LINQ的一个解决方案：

Here's a solution with LINQ:

public static List<DateTime> GetDates(int year, int month)
{
   return Enumerable.Range(1, DateTime.DaysInMonth(year, month))  // Days: 1, 2 ... 31 etc.
                    .Select(day => new DateTime(year, month, day)) // Map each day to a date
                    .ToList(); // Load dates into a list
}

一个带循环：

public static List<DateTime> GetDates(int year, int month)
{
   var dates = new List<DateTime>();

   // Loop from the first day of the month until we hit the next month, moving forward a day at a time
   for (var date = new DateTime(year, month, 1); date.Month == month; date = date.AddDays(1))
   {
      dates.Add(date);       
   }

   return dates;
}

您可能需要考虑返回一串流日期而不是列表< DateTime> ，让调用者决定是否将日期加载到列表或数组/后处理它们/部分迭代它们。对于LINQ版本，您可以通过删除对 ToList（）的调用。对于for循环，您需要实现迭代器。在这两种情况下，返回类型都必须更改为 IEnumerable< DateTime> 。

You might want to consider returning a streaming sequence of dates instead of List<DateTime>, letting the caller decide whether to load the dates into a list or array / post-process them / partially iterate them etc. For the LINQ version, you can accomplish this by removing the call to ToList(). For the for-loop, you would want to implement an iterator. In both cases, the return-type would have to be changed to IEnumerable<DateTime>.

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