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If you must whine about some product's failings then please do so in the appropriate place[^].
The best things in life are not things.
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While C# and VB.Net are roughly equivalent and great for building a variety of different types of apps, libraries, services etc, F# is a specific type of language for functional programming (FP).
You're coming at it from the wrong angle if you think of F# as being equivalent to VB.Net. It's not intended to do the same job.
I think most people would envisage F# being used to implemented specific bits of logic in a functional manner, using VB.Net or C# as a front end.
Pretty much every problem can be solved without resorting to Functional programming, but if you are working with certain types of problems the use of FP can provide startling improvments (less code...cleaner simpler more logical solutions)
Even if you see an opportunity to use FP, you will probably find you can do what you need using FP features of C# rather than resort to F#.
Forget about F# for now, look into FP in general. The whole paradigm might not even be worth your while. I find it facinating but I've yet to find a use for it in my projects. I'm sure I will though.
Like a lot of things, even if you never use FP, it will change the way you think about your procedural code, so it's worth a look.
F# will never replace VB.Net.
A more likely scenario is that C# will expand to provide all the Functional Programming Goodness and there won't be a need for a separate language. FP could represent a splitting point between C# and VB.Net because I really don't see much point trying to shoehorn FP into VB.Net. Most attempts to do so lead to UGLY UGLY syntax.
I don't want to start a war of words here, but as a very long term BASIC>VB>VB.NET developer, I've switched to C# and I won't ever go back. I should have switched a long time ago.
-Rd
Hit any user to continue.
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Hi
I have a folder called OTRS Ticketing system which is developed using Perl. I need to open the perl files in design mode so that i can make any changes in design layout . Is there any Perl IDE for opening & changing design layout.
I downloaded Editplus, Komodo but all are one we can view code and make changes in code. But not able to see as design view.
How to do this. Any suggestion for Perl development tool which we can use for opening perl files in design mode.
Anybody knows, please reply.
Thanks in advance.
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You might want to ask in a Perl forum/site.
sr159 wrote: I need to open the perl files in design mode so that i can make any changes in
design layout
And why exactly do you think you "need" to do that?
I suspect Perl isn't doesn't fit that as nicely as something like C# does.
I would also suspect that perl created without that idiom isn't going to be well suited to such a use even if something supports it.
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I am building a diagramming tool that will import an SVG as background and then create a network like diagram on top of it.
The objects that i will be using to draw diagram will also be SVG files.
So I would like to know whether the WPF is the way to go or something else?
Bharat
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If you are comparing WPF(Xaml) to Windows Forms (GDI+) I'd go the WPF route. Don't quote me but Xaml is a subset of SVG, GDI+ is not. Another option would be Silverlight which is also Xaml based.
"You get that on the big jobs."
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Thank you so much.
Bharat
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Hello,
I am working on a GUI for XNA. I deliberately work on an older computer with a GeForce 7900 graphics card, so that I run into performance issues quicker than on a more up to date system. There is a small testing application that displays a GUI window with controls over an animated 3D scene. Here is a screenshot (sorry for the models, I'm not much of an artist):
http://img829.imageshack.us/i/screenshotja.jpg/[^]
Most work is done in two threads. One does the rendering, the other one is the UI thread. I have noticed, that both threads are always running on the same CPU core. For testing this is great. It forces me to do some profiling and refactoring when the CPU hits the ceiling. Under normal circumstances I would prefer to have the rendering thread on one core and the UI thread on the other. This way both thread would have lots of reserves left and should never get into any performance problems.
The problem is that I don't appear to have much influence on where the system schedules the threads. Am I overlooking something? Is there a way to make more efficient use of the CPU cores?
Edit: Sorry, I forgot: Pls gimme codez. Its urgentz. 
"I just exchanged opinions with my boss. I went in with mine and came out with his." - me, 2011
---
I am endeavoring, Madam, to construct a mnemonic memory circuit using stone knives and bearskins - Mr. Spock 1935 and me 2011
modified on Tuesday, April 19, 2011 2:17 AM
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The behavior of CPU load on multicore machines is very strange. When I run a Virtual machine with one virtual processor on a dual core host, and the virtual machines requires 100% of "its" core, Windows task manager does not report one core at 100% with the other at a low amount, but both cores with varying loads amounting in sum to just more than one fully used core.
Consequently, I would not worry about how to get the work load balanced between the cores, the operating system (same effect on Linux!) - or even the processor itself - is doing something already.
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Well, both threads together run at 70% average of the one CPU they both run on. Sometimes the UI thread needed a little more and that CPU goes up to 100%. This also affects the rendering thread and the result is choppy rendering. I was able to optimize those peaks away and everything is fine now, but the point is that I want to prevent this as good as I can. Up to now I saw nothing that would make me hope that the system does anything to prevent that.
"I just exchanged opinions with my boss. I went in with mine and came out with his." - me, 2011
---
I am endeavoring, Madam, to construct a mnemonic memory circuit using stone knives and bearskins - Mr. Spock 1935 and me 2011
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This[^] says don't do it, then gives you links to how to do it....but not for .NET
CDP1802 wrote: Edit: Sorry, I forgot: Pls gimme codez. Its urgentz.
But here[^] has some C# code using an interop.
Not going to yell about not Googling "setting thread affinity", since I never would have looked it up, otherwise. Gonna play around with it, now.
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Thanks. You can't guess how much I googled and searched for threads and processes. But it's really easy as soon as you know the right name for what you are looking for.
"I just exchanged opinions with my boss. I went in with mine and came out with his." - me, 2011
---
I am endeavoring, Madam, to construct a mnemonic memory circuit using stone knives and bearskins - Mr. Spock 1935 and me 2011
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Like asking someone how to spell a word and they say Look it up. 
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I would like to start playing around with the supposed great new language. I have Visual Studio 2008 and all the Visual Studio 2010 Express IDEs. I downloaded the F# development packages (InstallFSharp & InstallFSharpPowerPack.) It seems that the only thing I can do to use F# is to open some crappy console window. Is there any way for me to be able to set up regular WinForm & WebApp components with F# through one of my existing IDE's? What would be the point in me trying to help out Micro$oft's new language if the damn thing will only allow me a crappy console IDE? Why would I want to waste my time on this? 
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If you compare a C# winforms project with a console project you will see the main difference is the Program.cs file calls Application.Run with a new instance of the start up form. Also the project output type (in project properties) is set to Windows Application instead of Console Application.
You can do this in F# too. First change the project output type to Windows Application.
Then, you can create a form in code and send it to Application.Run:
open System.Windows.Forms
let formMain = new Form()
Application.Run(formMain)
I'm not sure if it's possible to use the designer to create/modify forms though.
[Edit] You will also need to add a reference to System.Windows.Forms of course! [/Edit]
[Edit2] Just found this article[^] [/Edit2]
Dave
Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.
Astonish us. Be exceptional. (Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
modified on Thursday, April 14, 2011 3:53 PM
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swampwiz wrote: I would like to start playing around with the supposed great new language.
swampwiz wrote: Why would I want to waste my time on this?
I think you answered your own question.
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I had a discussion at work today.
I made a Class that keeps a Private Dictionary(Of String, List(Of IMyInterface)).
I have exposed some Methods that allow adding to the List(Of IMyInterface). The managing of the Dictionary is handled in my Class.
Now to add or delete an item to or from a list, that belongs to a Key in the Dictionary I have made a Method that can be called like:
MyClass.AddToList("Key", New IMyInterfaceClass1)
MyClass.AddToList("Key", New IMyInterfaceClass2)
MyClass.DeleteFromList("Key", TypeOf(IMyInterfaceClass1))
MyClass.DeleteFromList("Key", TypeOf(IMyInterfaceClass2))
Now a co-worker said that a beginning programmer could not understand this(?) and that it should look like:
MyClass.AddToList(Of IMyInterfaceClass1)("Key")
MyClass.AddToList(Of IMyInterfaceClass2)("Key")
MyClass.DeleteFromList(Of IMyInterfaceClass1)("Key")
MyClass.DeleteFromList(Of IMyInterfaceClass2)("Key")
I can agree with him that his method looks pretty nice, but programming is not about beauty of code (not completely anyway). According to my co-worker my Class should be responsible for the creation of the Type that is given to the Generic Method. I do not think that creating Classes using Reflection is really best practice if you have other options, and I have never seen Microsoft Classes (or any Class) that works like this. On top of that it becomes impossible to add a IMyInterfaceClass that requires parameters in its constructor.
Have I really not understood anything about programming or am I really so good that I am the only one who understands how to pass Classes as a parameter to a Function? 
It's an OO world.
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Naerling wrote: Now a co-worker said that a beginning programmer
A truly beginning programmer understands nothing and will have trouble with everything.
Someone who is a bit more than a beginner, say two years of experience, is going to understand what they have been exposed to and will have difficulty with anything else. So if they have seen one idiom then the other will be the problematic one. It doesn't matter which one it is.
Naerling wrote: I do not think that creating Classes using Reflection
is really best practice if you have other options,
Correct. You use reflection because you must not because you can.
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Exactly my thoughts... Besides, if a beginner is such a beginner that he can't pass a Class as a parameter I doubt that he can call a Generic Method 
It's an OO world.
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Assuming that I followed your naming convention in assuming that both IMyInterfaceClass1 and IMyInterfaceClass2 are expected to implement IMyInterface, you both are partially right. Your solution is superior on insertion, while your coworker's solution is superior on removal.
It is better to accept an instance of IMyInterfaceClass on insertion, because it does not tie your implementation to classes with default constructors. It is better to use a generic on removal because doing so lets you have the compiler enforce the requirement that IMyInterfaceClass1 and IMyInterfaceClass2 are implementations of IMyInterface, rather than relying on a run-time check.
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That sounds good. Although the removing method checks if the given type is in the list and if it is it removes it. If it is not it simply does nothing. Although the generic would make it clear that you can only remove IMyInterfaceClasses, since those are the only ones you can add
My 5 for the suggestion.
It's an OO world.
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Silently ignoring a call that passes an incompatible type is not a good idea. In 100 cases out of 100, calls like this indicate that the caller has made a typo: he couldn't have possibly added the item that he is trying to remove, so it's a logical error. As the result, whatever he meant to remove does not get removed, and it all happens silently. The piece of code that finds the item that has been left behind may be far away from the code containing the actual error. That's why I'd prefer a generic: it catches the typos at compile time, preventing potentially costly debugging sessions virtually for free.
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dasblinkenlight wrote: In 100 cases out of 100, ...That's why I'd prefer a generic: it catches the typos at compile time,
preventing potentially costly debugging sessions virtually for free.
In 40 years of programming I haven't seen 100 errors associated with incorrect type usage.
Not even sure I have seen 10.
On the other hand I have seen more than 10 and probably as many as 50 logic errors in code in the past 4 years that either were explicit security problems or had the potential for that.
And thousands of other types of logic errors.
And quite few very obtuse errors some that required hours (at least) to debug involving reflection.
So generics are amusing but they are far from vital.
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The other posts have already given a good answer to your question, so all I'd like to add is:
When first reading the code, your version of the code is clearer (to me). It's very clear that you are adding what's in the parameter.
In your co-workers example, I'd think AddToList does something with adding "Key" to a list, and I wouldn't readily be able to figure out what the generic is doing there in that function.
Same with the deletion: your code makes it clear *what* you are deleting, whereas the alternative leaves it unclear to me what is actually being deleted. Though it is less confusing with the delete than with the add.
So, for first time readability, I'd use your code too.
Combining that with the previous comments: either leave your code as it is, or use your code for adding and the co-workers code for removing (so you get the compile-time type checks).
Best Regards,
MicroVirus
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Generics is about knowing the type at compile-time - you only know the type at execution time.
There are two ways of fixing this:
*
Make the generic code call the non-generic code instead. That's easy, but you won't have any of the benefits of generics.
*
Use reflection to call the generic code from the non-generic code. That's fiddly and won't perform as well, but you can deprecate the non-generic code and eventually remove it.
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