Find a file with a certain extension in folder

Question

Given a folder path  like C  Random Folder   how can I find a file in it that holds a certain extension  like txt  I assume I ll have to do a search for   txt in the directory  but I m not sure how I m supposed to start this search in the first place

User · Answer

The method below returns only the files with certain extension  eg  file with  txt but not  txt1   public static IEnumerable lt string gt  GetFilesByExtension string directoryPath  string extension  SearchOption searchOption                return             Directory EnumerateFiles directoryPath        extension  searchOption                   Where x   gt  string Equals Path GetExtension x   extension  StringComparison InvariantCultureIgnoreCase

User · Answer

Look at the System IO Directory class and the static method GetFiles  It has an overload that accepts a path and a search pattern  Example    string   files   System IO Directory GetFiles path     txt

User · Answer

You could use the Directory class   Directory GetFiles path     txt   SearchOption AllDirectories

User · Answer

Use this code for read file with all type of extension file     string   sDirectoryInfo   Directory GetFiles SourcePath

User · Answer

As per my understanding  this can be done in two ways    1  You can use Directory Class with Getfiles method and traverse across all files   to check our required extension      Directory GetFiles  your folder path  i  Contains    txt     2  You can use Path Class with GetExtension Method which takes file path as a parameter and verifies the extension To get the file path  just have a looping condition that will fetch a single file and return the filepath that can be used for verification      Path GetExtension your file path  Equals   json     Note   Both the logic has to be inside a looping condition

User · Answer

It s quite easy  actually   You can use the System IO Directory class in conjunction with System IO Path   Something like  using LINQ makes it even easier    var allFilenames   Directory EnumerateFiles path  Select p   gt  Path GetFileName p        Get all filenames that have a  txt extension  excluding the extension var candidates   allFilenames Where fn   gt  Path GetExtension fn       txt                                 Select fn   gt  Path GetFileNameWithoutExtension fn      There are many variations on this technique too  of course   Some of the other answers are simpler if your filter is simpler   This one has the advantage of the delayed enumeration  if that matters  and more flexible filtering at the expense of more code

[c#] Find a file with a certain extension in folder

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