C#分组/排序通用列表使用LINQ [英] C# Grouping/Sorting a Generic List<> using LINQ

问题描述

我希望对通用列表进行分组和排序.我有一个代表文件的对象列表，每个对象都有一个FileName，FileType和FileDate属性. FileType定义为枚举.

Im looking to group and sort a Generic List<>. I have a list of objects representing files and each of these objects has a FileName, FileType and FileDate property. FileType is defined as an enumeration.

我有一些工作代码，可让我按FileType将文件列表分组在一起.

I have some working code which allows me to group together lists of files by FileType.

var fileGroups = fileList.GroupBy(f=> f.FileType)

foreach (var group in fileGroups )
{
   foreach (var file in group)
   {
   }
}

我想做的是按照FileType枚举值对fileGroups进行排序，然后按FileDate对fileGroups中的每个组进行排序.

What I would like to be able to do is order fileGroups by the FileType enumeration value and then each group within fileGroups by the FileDate.

推荐答案

var sortedThing = fileGroups
                  .OrderBy(g => g.Key)             // (1) Order the groups
                  .Select(g => g.OrderBy(f => f.FileDate));   // (2) Order *each* group

您需要对组进行排序(1)，将每个组在内部进行排序(2);

You need the groups sorted (1) and each of the groups sorted internally (2);

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