如何使用LINQ从目录中过滤文件? [英] How to filter files from directory using LINQ?

问题描述

在我的程序c#中，我正在使用LINQ从目录中提取所有文件以进行如下处理

In my program c#, i am using LINQ to fetch all file from directory for processing as following

var FilesToProcess = from filePath in Directory.GetFiles(sDirectory)
                        where File.GetCreationTime(filePath).BusinessDaysUntil(DateTime.Today)
                        select filePath;
if (FilesToProcess.Any())
{
    List<string> process = (from string s in FilesToProcess
                            where ((s.EndsWith(".ext")) || (s.EndsWith(".xml")))
                            select s).ToList();
}

但是在我的情况下，我有同名的xml和txt文件，例如A.xml和A.txt，类似地B.xml和B.txt，其他文件也相同.

But In my case i have xml and txt files of same name like A.xml and A.txt similarly B.xml and B.txt and same for others.

我想使用LINQ来获取两个相同名称的文件以进行如下处理

I want to use LINQ to fetch both files of same name for processing as following

Processfile(字符串xmlfile，字符串txtfile)

Processfile(string xmlfile, string txtfile)

根据我上面的代码，我从目录中获取所有文件(xml，txt)，但我不知道进一步进行操作.

As per my above code, i am getting all files(xml, txt) from directory, but i don't know to proceed further.

请帮助过滤名称相同但扩展范围不同的文件?

Please help to filter the files of same name but different extention?

推荐答案

您可以使用

You can use the Linq GroupBy method to do this, eg:

DirectoryInfo directory = new DirectoryInfo(sDirectory);
var filePairs = directory
            .GetFiles("*.xml")
            .Union(directory.GetFiles("*.txt"))
            .GroupBy(file => file.Name);

或者，如果您只希望成对获取文件，则:

Or if you wish to get just the files in pairs:

var filePairs = directory
            .GetFiles("*.xml")
            .Union(directory.GetFiles("*.txt"))
            .GroupBy(file => file.Name)
            .Select(grp => new
            {
                 XmlFile = grp.FirstOrDefault(file => file.Extension == "xml"),
                 TxtFile = grp.FirstOrDefault(file => file.Extension == "txt")
            })
            .Where(pair => pair.XmlFile != null && pair.TxtFile!= null);

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