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You pretty much summarized the reason to explicitly call Dispose on objects that implement it 
One thing I noticed though; was you said it can make the code ugly if you have multiple objects to call dispose on; you can simplify it; if they are in one block.
Font f = ....;
Brush br = ....;
Bitmap bi = ....;
try
{
.....
}
finally
{
f.Dispose();
br.Dispose();
bi.Dispose();
}Could become
using(Font f = ....)
using(Brush br = ....)
using(Bitmap bi = ....)
{
.....
}Which is much much cleaner than the mass indentation you would get otherwise.
James
"Java is free - and worth every penny." - Christian Graus
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using(Font f = ....)
using(Brush br = ....)
using(Bitmap bi = ....)
This works. But unfortunately, the generated code still has 3 try{}finally{} blocks.
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um, could you give me an example of ugliness?
the more resources "used", the more code it autogenerates for you!
the using statement lets you focus on the intent of the code instead of the mundane plumbing.
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It's a matter of personal preference
File f1 = null;
File f2 = null;
try
{
}
finally
{
if (f1 != null)
f1.Dispose();
if (f2 != null)
f2.Dispose();
}
using(f1 = new File(..))
{
using(f2 = new File(..))
{
}
}
I prefer the former.
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um... you can put both in the same using statement parens.
so it becomes
using(
Font f1 = new File(..),
Font f2 = new File(..)
) {
// do your thang
}
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Wow, I never knew that.  Thanks.
But still C++ detructor stuff is far better.
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Andy Smith wrote:
using(
Font f1 = new File(..),
Font f2 = new File(..)
) {
Actually you can't quite do that.
If you have multiple variables of the same type it will work, but you need to omit the second "Font"; so it becomes using(Font f1 = new Font(...), f2 = new Font(...)).
If you wish to declare two different types you can do that as well; but you need to use two using statements.
using(Font f1 = new Font(...))
using(FileStream file = new FileStream(...))
{
...
}That's a lot of elipsis 
James
"Java is free - and worth every penny." - Christian Graus
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oh, ya, thanks for the correction.
still better than the alternative.
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Hi
I dont even know how to start asking what I want to know. 
1. I assume these are only for variables (objects, whatever) that is needed in a global scope. My understanding is that if you declare and create a new object within {} it will be disposed/finalized automatically when the {} ends.
Is my understanding correct?
2. If correct, does the above post refer to disposing/finalizing global variables when they no longer needed, in case they taking up too many resources?
3. Now I'm too confused what the hell I wanted to know  
I think I'll go read up on it some more.
PS: Can someone perhaps explain with a realworld / code why it should be used and where specifically.
READ MSDN
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your understanding on 1 is incorrect.
the variable may go out of scope at the end of a block, but that does not mean that the GC will immediately collect it. The GC collects memory on its own schedule.
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thx, some reading made me understand some more ( i somehow understand MSDN english better than some of the people's posts here ).
to sum it up:
u would only use the using statement when u need to immediately free up resources, if so desired, else the GC will take care of it in its own time.
READ MSDN
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Hi!
Can I use OpenGL from C#?
If yse how do I do it? Can I get an example?
Thanks
Ilan Ehrenfeld
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Nice link
James
"Java is free - and worth every penny." - Christian Graus
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Hello,
I want to use containers that are feature rich and have corresponding iterators that can modify the object on the fly. Also, I would like to have at my disposal a set of common algorithms that I can use with the containers/iterators. I was wondering if there is anything like that out there besides the .NET Framework Collections that I can use. Can anyone recommend any library that is available?
Thanks.
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Is this a troll ? You're describing the STL, and it's not available in C#.
Christian
I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002
Remember that amateurs built the ark. Professionals built the Titanic.
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You are right that something like STL is not available in the .NET Framework, and that is why I posted a simple question here to find an alternative. I need something to do dynamic data processing, and the Collections API does not cut it.
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Doesn't ArrayList or other collection class meet your requirement?
I'm amumu, and you?
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As a collection, I can get by with ArrayList, but I also need to utilize varies algorithms dynamically to operate on the values in the ArrayList. Is there a way to do this with .NET besides writing my own, or is there a library available that I can use?
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I believe you CAN specify sorting algorithms for ArrayList ( what a dumb name - is it an array, or a list ? ), but beyond that, you're on your own.
Christian
I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002
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If the object you stored in Array implements the IComparable interface, you can use Array.Sort to sort the elements by your own algorithms.
I'm amumu, and you?
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Hello
I newbie in C#. can anybody help me with such problem as changing color of item in ListBox by clicking on item.
Thanks in advance
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