找到一个给定的范围缺少的日期 [英] Find missing dates for a given range

问题描述

我试图寻找失踪的两个日期时间变量之间的日期创建DateTime对象的集合。

I'm trying to find missing dates between two DateTime variables for a collection of DateTimes.

例如。

Collection
2010-01-01
2010-01-02
2010-01-03
2010-01-05

DateRange
2010-01-01 -> 2010-01-06

会给我一个列表< D​​ateTime的> 的

2010-01-04
2010-01-06

我能想到的几个是实现这一点，但什么都不干净和简单

I can think of a few was of implementing this but nothing clean and simple

任何想法

推荐答案

我能想到很多执行本办法的，例如：

I can think of a lot of ways of implementing this, e.g.:

DateTime[] col = { new DateTime(2010, 1, 1),
                   new DateTime(2010, 1, 2),
                   new DateTime(2010, 1, 3),
                   new DateTime(2010, 1, 5)};

var start = new DateTime(2010, 1, 1);
var end = new DateTime(2010, 1, 6);

var range = Enumerable.Range(0, (int)(end - start).TotalDays + 1)
                      .Select(i => start.AddDays(i));

var missing = range.Except(col);

和你可以把范围，塞给她一个扩展法

And you could put the range-stuff into an Extension-Method

public static class extensions
{
    public static IEnumerable<DateTime> Range(this DateTime startDate, DateTime endDate)
    {
        return Enumerable.Range(0, (int)(endDate - startDate).TotalDays + 1)
                         .Select(i => startDate.AddDays(i));
    }
}

那么这将是简单

Then it would be simply

DateTime[] col = { new DateTime(2010, 1, 1),
                   new DateTime(2010, 1, 2),
                   new DateTime(2010, 1, 3),
                   new DateTime(2010, 1, 5)};

var start = new DateTime(2010, 1, 1);
var end = new DateTime(2010, 1, 6);
var missing = start.Range(end).Except(col);

但也许这并不是一个高性能的解决方案： - ）

But maybe this is not a high-performance-solution :-)

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