Comments on: How To User StreamReader to Open A File ReadOnly in C# (.NET)

By: Ben

Ben — Thu, 06 Oct 2011 21:46:28 +0000

I beleive that you want to do something like this

using( FileStream s = File.OpenRead(filename))
{
using(TextReader reader = new StreamReader(s))
{
// Do smoething
}
}

This ensures the both streams get closed properly.

Cheers
Ben

MarkJoel60 — Wed, 17 Aug 2011 19:47:18 +0000

@Ash: I believe you are incorrect. I am using VS2010, and this works:

System.IO.StreamReader streamReader = new System.IO.StreamReader(System.IO.File.OpenRead(“myfile.txt”));

Ash — Fri, 23 Jul 2010 18:27:44 +0000

File.OpenRead(file) .. doesn’t seem to work in VS 2010 C#. The only option (in Intellisense) I get is file.OpenFile no file.openRead. Any thoughts?

Peter — Tue, 08 Dec 2009 20:06:55 +0000

Hi Ryan,
Sorry, don’t know about performance, but I’d guess opening in ReadOnly has not perf impact.
-Peter

Ryan — Tue, 08 Dec 2009 20:06:03 +0000

Nice, I did not know of that static method.

Do you know if it improves performance/memory if opening a file for reading purposes only vs. opening it in RW mode?

Bartek — Tue, 08 Dec 2009 12:03:21 +0000

Thanks Peter, I was just looking for something like this!