Question

我正在尝试显示上周，周一至周五之间创建的Excel文件。例如，如果是星期一，我想在上周一和周五之间查找文件。如果它是同一周的星期五，我想查询相同的时间范围。

我知道以下代码会给我昨天的结果，但我如何获得日期范围？感谢。

string[] files = Directory.GetFiles(FBD.SelectedPath, "*.xls")
   .Where(file => new FileInfo(file).CreationTime.Date == DateTime.Today.AddDays(-1))
   .ToArray();

Answer 1

首先，您需要检查DateTime.Now.Day以获取星期几，然后添加或减去x天数来创建范围并向.where添加AND子句：

  //Add AND clause to .where and add or subtract days occordingly to create range, instead of using == you would use <= end and >= start
    string[] files = Directory.GetFiles(FBD.SelectedPath, "*.xls")
       .Where(file => new FileInfo(file).CreationTime.Date >= DateTime.Today.AddDays(-1) && new FileInfo(file).CreatTime.Date <= DateTime.Today.AddDays(1)
       .ToArray();

Answer 2

<不仅可以与>相媲美，还可以与DateTime lastMonday = DateTime.Today.StartOfWeek(DayOfWeek.Monday); if(lastMonday == DateTime.Today) lastMonday = lastMonday.AddDays(-7); DateTime lastFriday = lastMonday.AddDays(4); string[] files = Directory.GetFiles(FBD.SelectedPath, "*.xls") .Select(f => new { File = f, CreationDate = File.GetCreationTime(f).Date }) .Where(x => x.CreationDate >= lastMonday && x.CreationDate <= lastFriday) .Select(x => x.File) .ToArray();或StartOfWeek相媲美。我会使用更便宜的File.GetCreationTime method：

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Answer 3

var fileInfos = Directory.GetFiles(FBD.SelectedPath, "*.xls").Select(file => new FileInfo(file));

var files = fileInfos
                .Where(fi => fi.CreationTime.Date >= DateTime.Today.AddDays((int)DayOfWeek.Monday - (int)DateTime.Today.DayOfWeek - 7) 
                       && 
                       fi.CreationTime.Date < DateTime.Today.AddDays((int)DayOfWeek.Saturday - (int)DateTime.Today.DayOfWeek) - 7)
                .ToArray();

检查是否必须＆lt; DateTime.Today.AddDays((int)DayOfWeek.Saturday - (int)DateTime.Today.DayOfWeek) - 7)如果您考虑小时，因为DateTime.Today会在凌晨12:00:00给你，所以如果你输入＆lt; = DateTime.Today.AddDays((int)DayOfWeek.Friday - (int)DateTime.Today.DayOfWeek) - 7)，那么如果该字段有小时将无法正常工作。< / p>

否则（不考虑小时）你可以这样做＆lt; = DateTime.Today.AddDays((int)DayOfWeek.Friday - (int)DateTime.Today.DayOfWeek) - 7)

Answer 4

类似的东西：

string [] files = Directory.GetFiles（FBD.SelectedPath，“* .xls”） .Where（file =＆gt; new FileInfo（file）.CreationTime.Date＆gt; = DateTime.Today.AddDays（-2）＆amp;＆amp; new FileInfo（file）.CreationTime.Date＆lt; = DateTime.Today.AddDays（ -1）） .ToArray（）;

C＃GetFiles .Where（日期范围）

4 个答案: