I don't have a compiler near me at the moment (web accessing from home)
but as *I* understand using blocks [1] they basically translate into a
try/finally where a special instance of the IDisposable object is
created for you and then always disposed in a finally block. Well, at
least that's how I understand it to work "logically"...don't know if
implementation is precisely like that...but the gist should be close.
I *think* what is happening, is that the optimizer is having issues with
the nested using blocks because it's getting confused on the local
scoping of the specialInstance of the IDisposable object that is created
for you. I've heard of something similar happening within VB.NET as well
within For/Next blocks when trying to use an Exit For statement...
Nice catch though, I'll make be aware of it when programming in the
future.
> -----Original Message-----
> From: Richard Blewett
> Sent: Wednesday, August 27, 2003 12:35 PM
> To: [EMAIL PROTECTED]
> Subject: [ADVANCED-DOTNET] Nasty bug in 1.0 and 1.1 compiler
>
>
> The code below executes both the if and the else
> in release build with optimization turned on
>
> <code>
<snipped />
> </code>
>
> commenting out the using block in the if block or putting
> code after the using block in the if resolves the problem
>
> Regards
>
> Richard Blewett
> DevelopMentor
>
[1]
class DisposableClass : Idisposable {public void Dispose(){}}
class Class1
{
static void Main(string[] args)
{
try
{
try
{
DisposableClass specialInstance = new DisposableClass()
try
{
if(args.Length == 0)
{
Console.WriteLine("IN THE IF");
try
{
DisposableClass specialInstance = new DisposableClass()
//nothing to do
}
finally
{
specialInstance.Dispose();
}
}
else
{
Console.WriteLine("IN THE ELSE");
try
{
DisposableClass specialInstance = new DisposableClass()
//nothing to do
}
finally
{
specialInstance.Dispose();
}
}
}
catch(System.Exception) {}
}
finally
{
specialInstance.Dispose();
}
}
catch(System.Exception) {}
Console.WriteLine("ending called");
}
}
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