.NET/C# - Disposing an object with the 'using' statement

Question

Suppose I have a method like so:

public byte[] GetThoseBytes() { using (System.IO.MemoryStream ms = new System.IO.MemoryStream()) { ms.WriteByte(1); ms.WriteByte(2); return ms.ToArray(); } }

Would this still dispose the 'ms' object? I'm having doubts, maybe because something is returned before the statement block is finished.

Thanks, AJ.

Simon Buchan · Accepted Answer · 2010-04-14 23:16:55Z

11

Yes. using (x = e) { s } is sugar for { x = e; try { s } finally { x.Dispose(); } }

answered Apr 14, 2010 at 23:16

Simon Buchan

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2 Comments

dthorpe Over a year ago

And a return inside the body of a try..finally will execute the finally clause before the return actually happens.

Simon Buchan Over a year ago

@dthorpe: Umm, yeah. Whoops :)

Michael Stum · Accepted Answer · 2010-04-14 23:15:48Z

4

Yes, Using creates a try..finally block, so it disposes the ms (and even does a null check in case you set ns to null).

answered Apr 14, 2010 at 23:15

Michael Stum

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1 Comment

Michael Stum Over a year ago

(Just ignore that nonsense about "The CLR converts your code into MSIL" in that article)

RedEye · Accepted Answer · 2010-04-14 23:19:42Z

Yes, the whole idea behind the Using statement is that it automatically disposes of whatever stream/object you are "using". nicely done.

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