C# 从给定日期循环数月和数年的简单方法
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easy way to loop over months and years from a given date
提问by Rochelle C
I have been trying to write this loop and it just keeps getting more complicated. Basically I want to take a given date and loop through every month until I reach the current month. So if the start date is 11/1/2011 then I want to loop through
我一直在尝试编写这个循环，但它变得越来越复杂。基本上我想取一个给定的日期并每个月循环，直到我到达当月。所以如果开始日期是 11/1/2011 那么我想循环
11/2011, 12/2011, 1/2012, 2/2012, etc.
11/2011、12/2011、1/2012、2/2012 等
Here is what I started with but this does not work. Once I hit a new year I need the inner loop to start over with 1 not startdate.Month. Is there a better way in general to loop through months and years? Thanks
这是我的开始，但这不起作用。一旦我进入新的一年，我需要内部循环从 1 开始，而不是 startdate.Month。一般有没有更好的方法来循环几个月和几年？谢谢
for (var y = startdate.Year; y <= DateTime.Now.Year; y++)
{
for (var m = startdate.Month; m <= 12; m++)
{
//do something with m and y
}
}
采纳答案by Sam Axe
Date target = new Date(2011, 4, 1);
while (target < Date.Today) {
// do something with target.Month and target.Year
target = target.AddMonths(1);
}
回答by Sudhakar Tillapudi
while (startDate <= DateTime.Now)
{
//here you will get every new month in year
Console.WriteLine(startDate.Month);
//Add Month
startDate=startDate.AddMonths(1);
}
回答by Matt Johnson-Pint
DateTime endDate = DateTime.Today;
for (DateTime dt = startDate; dt <= endDate; dt = dt.AddMonths(1))
{
Console.WriteLine("{0:M/yyyy}", dt);
}
But if you prefer while loops, then vote for Dan-o. I did. :)
但是，如果您更喜欢 while 循环，那么请投票给 Dan-o。我做到了。:)
回答by esteewhy
Generate a range (as IEnumerable`DateTime) of first days of a month in between of a given dates:
生成给定日期之间一个月第一天的范围（如 IEnumerable`DateTime）：
from range in new[] {
new {
start = new DateTime(2017, 6, 23),
end = new DateTime(2018, 09, 11)
}
}
select (
from y in Enumerable.Range(
range.start.Year, range.end.Year -
range.start.Year + 1
)
let ms = y == range.start.Year ? range.start.Month : 1
let me = y == range.end.Year ? range.end.Month : 12
select
from m in Enumerable.Range(ms, me - ms + 1)
select new DateTime(y, m, 1)
).SelectMany(y => y)
回答by Hüseyin Ya?l?
This will loop over the months and the day of the month will not be a problem.
这将在几个月内循环，一个月中的哪一天不会有问题。
var date = startDate;
var endDate = DateTime.Now;
while(date.Year < endDate.Year || (date.Year == endDate.Year && date.Month <= endDate.Month))
{
Console.WriteLine($"{date.Month}/{date.Year}");
date = date.AddMonths(1);
}
回答by Slothario
Sam's answer is nice but ultimately incorrect (if your start day is 20 and your end day is 10, it won't include the last month). Here's a version that works:
Sam 的回答很好，但最终是不正确的（如果您的开始日是 20，结束日是 10，则不包括上个月）。这是一个有效的版本：
public void GetMonths(DateTime startTime, DateTime endTime)
{
var dateCounter = new DateTime(startTime.Year, startTime.Month, 1);
var endDateTarget = new DateTime(endTime.Year, endTime.Month, 1);
while (dateCounter <= endDateTarget)
{
Console.WriteLine($"The year and month is: {dateCounter.Year}, {dateCounter.Month}");
dateCounter = dateCounter.AddMonths(1);
}
}
