How to write in a single file with multiple threads?

Question

I am creating Windows Application in C# in which I want to write in multiple files with multiple threads. I am getting data from different ports and there is one file associ

Answer 1

As mentioned in the comments, this is asking for trouble.

So, you need to have a thread-safe writer class:

public class FileWriter
{
    private ReaderWriterLockSlim lock_ = new ReaderWriterLockSlim();
    public void WriteData(/*....whatever */)
    {
        lock_.EnterWriteLock();
        try
        {
            // write your data here
        }
        finally
        {
            lock_.ExitWriteLock();
        }
    }

} // eo class FileWriter

This is suitable for being called by many threads. BUT, there's a caveat. There may well be lock contention. I used a ReadWriterLockSlim class, because you may want to do read locks as well and hell, that class allows you to upgrade from a read state also.