I have a file containing data that I'd like to monitor changes to, as well as add changes of my own. Think like "Tail -f foo.txt".
Based on this thread, it looks like I should just create a filestream, and pass it both to a writer and reader. However, when the reader reaches the end of the original file, it fails to see updates I write myself.
I know it seems like a weird situation... its more an experiment to see if it can be done.
Here is the example case I tried:
foo.txt:
a
b
c
d
e
f
string test = "foo.txt";
System.IO.FileStream fs = new System.IO.FileStream(test, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite);
var sw = new System.IO.StreamWriter(fs);
var sr = new System.IO.StreamReader(fs);
var res = sr.ReadLine();
res = sr.ReadLine();
sw.WriteLine("g");
sw.Flush();
res = sr.ReadLine();
res = sr.ReadLine();
sw.WriteLine("h");
sw.Flush();
sw.WriteLine("i");
sw.Flush();
sw.WriteLine("j");
sw.Flush();
sw.WriteLine("k");
sw.Flush();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
After getting past "f", the reader returns null.
Ok, two edits later...
This should work. The first time I tried it I think I had forgotten to set FileMode.Append on the oStream.
string test = "foo.txt";
var oStream = new FileStream(test, FileMode.Append, FileAccess.Write, FileShare.Read);
var iStream = new FileStream(test, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
var sw = new System.IO.StreamWriter(oStream);
var sr = new System.IO.StreamReader(iStream);
var res = sr.ReadLine();
res = sr.ReadLine();
sw.WriteLine("g");
sw.Flush();
res = sr.ReadLine();
res = sr.ReadLine();
sw.WriteLine("h"); sw.Flush();
sw.WriteLine("i"); sw.Flush();
sw.WriteLine("j"); sw.Flush();
sw.WriteLine("k"); sw.Flush();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();