Find and Replace text in all files of a given folder , including subfolders with C#

24 September, 2010 Roel van Lisdonk 6 Comments 1 category

If you want to find and replace some text in all files of a given folder, including subfolders, you can use the following C# code:

   string rootfolder = @"C:\Temp";
   string[] files = Directory.GetFiles(rootfolder, "*.*", SearchOption.AllDirectories);
   foreach (string file in files)
   {    try
     {    string contents = File.ReadAllText(file);
       contents = contents.Replace(@"Text to find", @"Replacement text");

       // Make files writable
       File.SetAttributes(file, FileAttributes.Normal);

       File.WriteAllText(file, contents);
     }
     catch (Exception ex)
     {    Console.WriteLine(ex.Message);
     }
   }

Tags: C#

Category: Uncategorized

6 Replies to “Find and Replace text in all files of a given folder , including subfolders with C#”

Shazmeister says:

November 16, 2015 at 10:49

Great code Roel, if i wanted to do multiple find and replace statements how would i do it i.e
I have the following tags i need to replace with nothing
Abner says:

December 2, 2015 at 20:40

Excellent !!!

Resolve my problem !!
Filipe says:

January 22, 2016 at 19:10

Hi,

I need to do more than 1 replace…how can I do that ? I tried to add more replace commands but it is not working.

Thank you
sadiya says:

March 13, 2018 at 14:27

Hi, thank you for this awesome code….it works and solves the issue…but i am using this for replacing the text for classic asp and after i run the code i am facing encoding issue…can you suggest?
Reihaneh says:

March 26, 2018 at 08:46

Hi,
This post is old, but it really helped me
Thank you soooooo much!
priyanka says:

February 1, 2019 at 15:21

worked ..Thank you so much 🙂