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.
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6 Answers
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"); 
6 Comments
Dominic K
Thanks! All the answers were good, but you answered first so... yeah :)
Adrian
This doesn't work if the extension would be something like txt_. I'm trying to determine if there are any *.exe file in a folder, and I only have one *.exe_ file, but the query returns it, which is not correct.
Randall Flagg
The Documentation: msdn.microsoft.com/en-us/library/8he88b63(v=vs.110).aspx
Prashant Pimpale
What if I want the single file who's named like
macos.txt
srk
To search recursively, call the overload with
SearchOption.AllDirectories. Something like this: string[] files = System.IO.Directory.GetFiles(path, "*.txt", SearchOption.AllDirectories);. (This is covered in other answers, but not this accepted answer.) |
You could use the Directory class
Directory.GetFiles(path, "*.txt", SearchOption.AllDirectories) 
2 Comments
Randall Flagg
This doesn't work if the extension would be something like txt_ or anything else as stated in the documentation msdn.microsoft.com/en-us/library/wz42302f(v=vs.110).aspx
t.durden
@RandallFlagg, I read the docs, disagree. There are special cases, 8.3 naming, longfilenames etc. *.txt and *.txt_ should be found. Look at the docs where they talk about 8.3 and xls and xlsx extensions
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 => Path.GetFileName(p)); // Get all filenames that have a .txt extension, excluding the extension var candidates = allFilenames.Where(fn => Path.GetExtension(fn) == ".txt") .Select(fn => 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.
1 Comment
Dominic K
Thanks for all the extra work you put into this. However, I'm just going for a simple statement since I only have one text file in the directory (it was extracted by my program).
The method below returns only the files with certain extension (eg: file with .txt but not .txt1)
public static IEnumerable<string> GetFilesByExtension(string directoryPath, string extension, SearchOption searchOption) { return Directory.EnumerateFiles(directoryPath, "*" + extension, searchOption) .Where(x => string.Equals(Path.GetExtension(x), extension, StringComparison.InvariantCultureIgnoreCase)); } 
Comments
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.
Comments
Use this code for read file with all type of extension file.
string[] sDirectoryInfo = Directory.GetFiles(SourcePath, "*.*"); 