October 22, 2012

C# - Check File is being used by another process, if not delete files


Some times while try to deleting a file we may got a error message like
"It is being used by another person or program."

This means we can't delete a file, if it is being used.

I provide a solution to handle this kind of exception.


 
        /// <summary>
        /// This function is used to check specified file being used or not
        /// </summary>
        /// <param name="file">FileInfo of required file</param>
        /// <returns>If that specified file is being processed 
        /// or not found is return true</returns>
        public static Boolean IsFileLocked(FileInfo file)
        {
            FileStream stream = null;
 
            try
            {
                //Don't change FileAccess to ReadWrite, 
                //because if a file is in readOnly, it fails.
                stream = file.Open
                (
                    FileMode.Open, 
                    FileAccess.Read, 
                    FileShare.None
                );
            }
            catch (IOException)
            {
                //the file is unavailable because it is:
                //still being written to
                //or being processed by another thread
                //or does not exist (has already been processed)
                return true;
            }
            finally
            {
                if (stream != null)
                    stream.Close();
            }
 
            //file is not locked
            return false;
        }


     /// This function is used to delete all files inside a folder 
     public static void CleanFiles()
     {
            if (Directory.Exists("FOLDER_PATH"))
            {
                var directory = new DirectoryInfo("FOLDER_PATH");
               foreach (FileInfo file in directory.GetFiles())
               { 
                  if(!IsFileLocked(file)) file.Delete(); 
               }
            }
     }

Source: Internet

8 comments:

  1. Thank you so much

    ReplyDelete
  2. This will not work, if file id opened in notepad

    ReplyDelete
  3. Good One!! My Issue solved, Thanks a lot.

    ReplyDelete
  4. If I want to force delete file used by another process. How we can achieve it.

    ReplyDelete

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