release resources by using a using statement

[Tony Johansson]

Hello!

Below I have a simple using construction. When this go out of scope which
close will be called
is the one in TextReader or the one in StreamReader

It must be the one in TextReader otherwise it's very strange.
The reson I ask it that a book called step by step C# 2005 is saying that
close in StreamReader will be called which must be totally wrong.

using (TextReader reader = new StreamReader(fu llPathname))
{
string line;
while ((line = reader.ReadLine ()) != null)
{
source.Text += line + "\n";
}
}

//Tony

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

Re: release resources by using a using statement

Tony Johansson wrote:

Below I have a simple using construction. When this go out of scope which
close will be called
is the one in TextReader or the one in StreamReader
>
It must be the one in TextReader otherwise it's very strange.
The reson I ask it that a book called step by step C# 2005 is saying that
close in StreamReader will be called which must be totally wrong.
>
using (TextReader reader = new StreamReader(fu llPathname))
{
string line;
while ((line = reader.ReadLine ()) != null)
{
source.Text += line + "\n";
}
}

It calls StreamReader Close, because what you have is an instance
of StreamReader. This is how polymorphism works.

Arne