C# "Using" Syntax

Question

Does the using catch the exception or throw it? i.e.

using (StreamReader rdr = File.OpenText("file.txt")) {  //do stuff } 

If the streamreader throws an exception is it caught by using or thrown so the calling function can handle it?

Answer 1

When you see a using statement, think of this code:

StreadReader rdr = null; try {     rdr = File.OpenText("file.txt");     //do stuff } finally {     if (rdr != null)         rdr.Dispose(); } 

So the real answer is that it doesn't do anything with the exception thrown in the body of the using block. It doesn't handle it or rethrow it.