The process cannot access the file xxxx because it is being used in another process

Question

User-1350042179 posted

Hi

I save a file with the code:

  private static void SaveFile(string fileName, byte[] data)
        {
            var directorio = ConfigurationManager.AppSettings["File:SharedPath"];
            if (data == null) throw new ArgumentNullException("data");

            var fileNamePath = string.Format(@"{0}\{1}", directorio, fileName);

            if (File.Exists(fileNamePath))
            {
                File.Delete(fileNamePath);
            }

            using (var fileStream = new FileStream(fileNamePath, FileMode.Append))
            {
                using (var bw = new BinaryWriter(fileStream))
                {
                    bw.Write(data);
                }
            }
        }

It works fine in IIS Express, but in IIS.. it fails with the error:

The process cannot access the file xxxx because it is being used in another process

I don't understand why it fails.

Answer 1

User475983607 posted

Your code is very confusing.  First you delete the file if it exists then try to append to the same file?  What are you appending to if the file has been deleted?

I assume the error is related to creating two different streams; FileStream and BinaryWrite.    Use either the FileStream or the BindaryWriter not both.  Ya know dude, the docs clearly and openly illustrate how to write to a file.

https://docs.microsoft.com/en-us/dotnet/api/system.io.filestream.write?view=netcore-3.1

https://docs.microsoft.com/en-us/dotnet/api/system.io.binarywriter?view=netcore-3.1

Answer 2

User-1350042179 posted

This post says that the code: file.create creates as filestream which is always open..

https://stackoverflow.com/questions/18957309/c-sharp-exception-file-is-being-used-by-another-process

If I save the file directly I don't have problems.