Re: Comparing ObservableCollections and making them same - C# Discussion Boards

Keith Barrow17-Sep-09 6:10

Keith Barrow

17-Sep-09 6:10

Put each IP Search onto a separate thread.
Whatever you sdo though the network response time is likely to be the limiting factor.

Luc Pattyn17-Sep-09 6:56

17-Sep-09 6:56

IMO bad advice. Using a few threads will help, launching tens or hundreds will result in hitting a bottleneck or a deliberate limitation inside the TCP/IP stack.

Smile | :)

Luc Pattyn

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Dave Kreskowiak17-Sep-09 7:22

Dave Kreskowiak

17-Sep-09 7:22

This is really bad advice. Did you know that your allocating 1MB of RAM PER THREAD you create and keep running?

I'd look at using the managed thread pool before I start launching threads by the hundreds.

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2006, 2007, 2008
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nhqlbaislwfiikqraqnm17-Sep-09 10:21

nhqlbaislwfiikqraqnm

17-Sep-09 10:21

how would you change the code that it scan it fast or what would you add everybody said an other solution!

Comparing ObservableCollections and making them same

Dave Kreskowiak17-Sep-09 10:41

Dave Kreskowiak

17-Sep-09 10:41

I'd design it so that I'd have about 5 or 10 or so threads all pulling IP addresses from a queue. Each of these workers would get an IP address, do it's job, report back, and then go get another address. You do NOT create a new thread for each IP address.

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Dave Kreskowiak
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Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

ramk_chirra17-Sep-09 5:16

ramk_chirra

17-Sep-09 5:16

Hi I have two ObservableCollections of an UserDefined Class which have an ID Property ,now i want to maintain 1 ObservableCollection locally and get another ObservableCollection from the DataBase,After i get them in one place i want to Compare those 2 ObservableCollections and delete the ID's from the local ObservableCollections which are not present in the ObservableCollections which is latest one(from Database).can some one give me the code for achieving this functionality.....Thanks in Advance

Re: Comparing ObservableCollections and making them same

Pete O'Hanlon17-Sep-09 5:24

Pete O'Hanlon

17-Sep-09 5:24

ramk_chirra wrote:
can some one give me the code for achieving this functionality.....

That's not really the way that the forums work. If you have code that doesn't work, we will try to help you fix it, we won't write it for you.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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Re: Comparing ObservableCollections and making them same

N a v a n e e t h17-Sep-09 5:43

N a v a n e e t h

17-Sep-09 5:43

ramk_chirra wrote:
Compare those 2 ObservableCollections and delete the ID's from the local ObservableCollections which are not present in the ObservableCollections which is latest one(from Database)

Why don't you have only one collection and each time you clear it and fill with latest data from DB? This will avoid unnecessary looping and deletions from one collection.

Navaneeth

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VB6 to C# conversion SetIndex issue

xtr33me17-Sep-09 4:20

xtr33me

17-Sep-09 4:20

I was wondering if anyone has run into this problem and gotten around it in any way. Currently I am performing a front end conversion from a VB6 GUI to C#. It is quite a big change and therefore we are performing this in stages. Now in this process we currently are using "Microsoft.VisualBasic.Compatibility.VB6" array objects at times eg.RadioButtonArray, CheckBoxArray, etc.

Now when using these, there is a "SetIndex" method that is used throughout the existing code and it seems that the designer does not like the idea of this method being called when EndInit has been called already. It essentially renders the designer useless and we get an error in the designer. What we currently do is in the "InitializeComponent" method we call only "BeginInit" on the various arrays, and then in the form constructor after "InitializeComponent" is called we have another method we created called "InitializeComponentArrays" which we call all methods needing to call "SetIndex" and then we call their "EndInit" methods. This allows designer to load everything fine until we make any adjustments to the designer. When this happens, the windows generated code inserts all the "EndInit" methods into the "InitializeComponent" method which causes the designer to crash, and I then need to go in and delete the lines that it has entered. It is quite annoying and I felt it was time to reach out and see if anyone else has any better resolutions.

Thanks everyone!
Dan

Luc Pattyn17-Sep-09 4:28

Re: VB6 to C# conversion SetIndex issue [modified]

17-Sep-09 4:28

Two suggestions:

1. don't touch the code inside InitializeComponent(), it isn't your code, it is the Designer's. And the Designer will change it any time it feels like changing it.

2. forget about SetIndex. If you need to easily access one or all of your checkboxes (or any other type of Control), create a collection yourself, by storing the references into a List<CheckBox> or something similar after your constructor called InitializeComponent(). A list accepts an integer index, so you can easily access the n-th checkbox if that is what you need.

Alternatively you can enumerate all top-level Controls of a Form, and pick the one(s) you need, like so:

foreach(Control c in this.Controls) {
    CheckBox cb=c as CheckBox;
    if (cb!=null) {
        // now cb points to one of your checkboxes
    }
}

Luc Pattyn

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N a v a n e e t h17-Sep-09 5:33

N a v a n e e t h

17-Sep-09 5:33

Luc Pattyn wrote:
foreach(Control c in this.Controls) {
CheckBox cb=c as CheckBox;
if (cb!=null) {
// now cb points to one of your checkboxes
}
}

This is where you can have the luxury of LINQ. How about

foreach (CheckBox  checkbox in from Control c in this.Controls
                         where c.GetType() == typeof(CheckBox)
                         select c as CheckBox)
{
}

Navaneeth

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modified on Thursday, September 17, 2009 11:43 AM

Luc Pattyn17-Sep-09 5:38

17-Sep-09 5:38

This may all be true and beautiful, but it is not what the OP needs; he is struggling with old VB code and fiddling with InitializeComponent(), so lets stick to the essentials and postpone the unnecessary magic.

BTW: I don't think your and my code are equivalent, mine also matches CheckBox derivatives.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

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xtr33me17-Sep-09 5:44

xtr33me

17-Sep-09 5:44

Thanks for the help! Our code is not the same Luc, but I see what you were trying to do so I am going to play with that. I can't thank you enough for the quick response! Thanks again!

Dan

premature garbage collection of static class causing problem

N a v a n e e t h17-Sep-09 5:45

N a v a n e e t h

17-Sep-09 5:45

My mistake. It should be CheckBox. Updated the post.

Smile | :)

Navaneeth

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akhanal17-Sep-09 4:05

Re: premature garbage collection of static class causing problem

17-Sep-09 4:05

Well I know only objects are garbage collected, but please hear me out..

I have a class "serverClass" in my program.cs file in a project. All the members of this class are static, moreover the members of this class are DLLIMPORTS of an unmanaged Dll. This file also has the IDE generated "Program" class which has the Main() function that invokes the Form1 GUI i.e.; Application.Run(new Form1());

Now, I have the Form1.cs file with Form1 class that has buttons and listboxes. The Form1 class has the button events, etc, i have also created a couple of member functions in the Form1 class (startServer() and stopServer()). These functions call the static members of the "serverClass" from the program.cs file. But as I said earlier the serverClass is static class and hence I cannot create an instance to access its functions, instead I go serverClass.function1() (i.e.; className.memberFunction()), serverClass.function2(), etc.

I want to access the startServer() and stopServer() functions on the click of the buttons "Start" and "Stop" respectively. So in the click events of these buttons I call these functions.

The project compiles fine. When I run the application/form and click 'Start' button the startServer() function is called and the server runs fine as desired. But my problem is when I click the 'Stop' button and the stopServer() function is called, I get a runtime error "CallbackOnCollectedDelegate" on the line in the stopServer() function where I call a member of serverClass as serverClass.function2().

I might be wrong in the class structuring itself....I appreciate all the suggestions and ideas.

BTW all of the mentioned classes are in the same namespace.

Luc Pattyn17-Sep-09 4:19

Re: premature garbage collection of static class causing problem

17-Sep-09 4:19

Without seeing any code, all one can do is guess. Maybe you have some local variables inside your static methods, say a delegate inside serverClass.Start() which is passed to some unmanaged piece of code, and hence all managed references to it are lost, so the next time around the GC will throw it out?

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

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akhanal17-Sep-09 4:31

Re: premature garbage collection of static class causing problem

17-Sep-09 4:31

Yes that was my guess too, the serverClass.Start(), takes a variable serverID so it is actually serverClass.Start(serverID); so I defined this variable in the serverClass as public and I use it in the functions as serverClass.Start(serverClass.serverID); and just to verify I tried printing this variable right before the line of error and it prints fine. As a matter of fact I tried accessing another function of serverClass from this position too, this function just reads some data that does not have anything thing to do with server creation or destruction and it works fine too.

But the combination; serverClass.Stop(serverclass.serverID); is problematic.

If the serverID is ok and serverClass.anotherFunction() is ok then what might be the issue???

Luc Pattyn17-Sep-09 4:57

Re: premature garbage collection of static class causing problem

17-Sep-09 4:57

1. again[^]

2. IMO things that have state should not be modeled as a static.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

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akhanal17-Sep-09 5:18

Re: premature garbage collection of static class causing problem

17-Sep-09 5:18

Thank you for your efforts, but I am bound not to release the code.

I tried making the serverClass as non static and defining its functions and variables as non static too but then: The DllImport attribute must be specified on a method marked 'static' and 'extern'

Oh this is something...

akhanal17-Sep-09 5:25

Error in Loading assembly from Assembly.Load

17-Sep-09 5:25

one more thing to add here, in the original console based application (c#), both the start() and stop() functions are in the main() and after the start() initiates, the console waits for the user to hit return (Console.readline()) and then the stop() function initiates.

All this works very fine in that application. I just wanted them to initiate on the click of the buttons.

SRKSHOME17-Sep-09 3:31

SRKSHOME

17-Sep-09 3:31

Hi,
I am getting an exception in the following code. Exception is "Could not load file or assembly 'AutomationAddIn, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c1461fa3837aae41' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418)"

AssemblyName _asmName = new AssemblyName();
_asmName.CodeBase = "file://" + "D://dinesh//CSharp//AutomationAddIn//AutomationAddIn//bin//Debug//AutomationAddIn.dll";

 Assembly.Load(_asmName);

Any suggestions?
Thanks.

Re: Error in Loading assembly from Assembly.Load

Not Active17-Sep-09 4:19

Not Active

17-Sep-09 4:19

"file://" is not necessary

only two letters away from being an asset

Re: Error in Loading assembly from Assembly.Load

Luc Pattyn17-Sep-09 4:20