Re: Clarification in WPF - C# Discussion Boards

OriginalGriff4-Feb-10 23:25

OriginalGriff

4-Feb-10 23:25

First: To paste it correctly, use the "encode HTML tags when pasting" option below the message entry box - this replaces the < and > characters with more protable ones.

Second: Try the correct forum - there is one for WPF where you will probably get better help than a dedicated C# forum.

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Joe Rozario4-Feb-10 23:27

Joe Rozario

4-Feb-10 23:27

Thank U .

V.5-Feb-10 0:58

5-Feb-10 0:58

See following thread. There is code that will animate the color.
It is in code-behind though, but maybe it's useful.

WPF Forum[^]

hope this helps.

(ps: The code in the thread combines two animations, strip out the color animation)

V.

Stop smoking so you can: Enjoy longer the money you save.
Moviereview Archive

Short cut key Problem in c# User Control

Joe Rozario5-Feb-10 1:02

Joe Rozario

5-Feb-10 1:02

Thank You friend .for your reply ...

i have solved the problem .... Big Grin | :-D

solution like these

private LinearGradientBrush Setcolour(string FirstColour, string sSecondColour, Point StartPoint, Point EndPoint, MatrixTransform MatrixTr)
{
LinearGradientBrush lgb = new LinearGradientBrush(GetColour(FirstColour), GetColour(sSecondColour), 0);
lgb.MappingMode = BrushMappingMode.Absolute;
lgb.StartPoint = StartPoint;
lgb.EndPoint = EndPoint;
lgb.Transform = MatrixTr;
return lgb;
}

MainBrush.Fill = Setcolour("#ffffffff", "#ff020202", new Point(141.363, 201.300), new Point(141.363, 252.324), new MatrixTransform(1.000, 0.000, -0.000, -1.000, -81.196, 252.324));

Thank u all ......

shashank35254-Feb-10 23:05

shashank3525

4-Feb-10 23:05

I have developed a user control in .net 2.0 framework. on user control i used table layout panel. to place the controls but in some cases i have to need to put 2 lable in a one cell so i used panel to put the 2 label one was windows lable and another was gobicode html lable in next ce4ll of table layout panel i put the text box. now i have arranged tab indexes properly. and short cut key given to the windows lable as i cant give short key to the gobicode. but in this case short cut for that text box is not working. Please help me.

Module based software

Eduard Keilholz4-Feb-10 21:11

Eduard Keilholz

4-Feb-10 21:11

Hey guys!

I have a question and I think the answer is 'Remoting', but I want to know for sure. I want to write an application which contains modules. Customers buy the 'base' software. If required, they buy additional modules which enables the software to 'do more'. Now all these modules are seperate projects (and thus seperate dll's). I want the software to check if a module is 'active', and then check for the existance of the dll, if both are OK, the system can reference the dll and use it.

Ofcource all modules are available at design time so referencing the dll's is no problem, but when starting the system with one or more dll's missing i'll receive a JIT Debugger message. Is there a way to not deliver all modules, but only deliver the 'active' modules and change that (change db values and copy the module dll's) without having to compile the software again?

And... Can I also accomplish this without module versioning? What I mean here, is that I may want to change (update or fix) modules which result in a new module dll (and a new version). Can I still use that dll from the 'base' system without having to decompile? (I am aware here, that I need to be very carefull what to change and not change (for example) return value types or so).

Hrmmm... a fairly large story, but I wanted to explain exactly what I want to get a satisfying answer. Since English is a foreign language for me I may have used some unneeded words Wink | ;)

Cheers guys!

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

Re: Module based software

Not Active4-Feb-10 21:20

multithreaded application

4-Feb-10 21:20

Maybe this will give you some ideas Application Suite Template[^]

I know the language. I've read a book. - _Madmatt

Member 5903104-Feb-10 19:31

Member 590310

4-Feb-10 19:31

hi,
i have a multithreaded application in which i m downloading files and updating GUI.it runs fine when i debug it but dnt update the GUI when i run it in release mode.tell me where i m wrong?

Re: multithreaded application

Not Active4-Feb-10 20:12

Re: multithreaded application

4-Feb-10 20:12

Member 590310 wrote:
tell me where i m wrong?

By giving us a vague description with no code to review. That's where you are wrong.

I know the language. I've read a book. - _Madmatt

Calla4-Feb-10 20:52

Calla

4-Feb-10 20:52

You've asked this very same question before and I asked you to tell us more about the problems you were having and to post some code. But you ignored my (and Luc's) reply and now you just post it again. This day didn't start very well, and you just made it worse... Mad | :mad:

how can i select null instances using datacontext.tablename.select ?

tonyonlinux4-Feb-10 19:13

tonyonlinux

4-Feb-10 19:13

private void LoadKeywordsCombo()
        {
                    using (var db = new momdbDataContext())
                    {
                        keywordsComboBox.DataSource = db.Books.Select(c=> c.Keywords !=null       
                        c=>new{ID=c.ID,Name=c.keywords});
                        keywordsComboBox.DisplayMember = "Name";
                        keywordsComboBox.ValueMember = "ID";
                    }
         }

I'm wanting to somehow select everything from the book table where keywords is !=null and populate my combo box accordingly. i thought it might be the .where() method but i'm not sure
thanks in advance for the help

Re: how can i select null instances using datacontext.tablename.select ?

Not Active4-Feb-10 20:10

Re: how can i select null instances using datacontext.tablename.select ?

4-Feb-10 20:10

Are you sure Keywords is null and not an empty string? Best use the IsNullOrEmpty method.

I know the language. I've read a book. - _Madmatt

tonyonlinux4-Feb-10 20:21

tonyonlinux

4-Feb-10 20:21

could you give an example of how i might use the isnullorempty in this instance ?
what i'm trying to avoid is a combobox witha bunch of blank fields where the keyword isn't added

Re: how can i select null instances using datacontext.tablename.select ?

Not Active4-Feb-10 20:48

Inheritance/Polymorphism [modified]

4-Feb-10 20:48

Read the documentation, Select take a predicate that returns a bool. string.IsNullOrEmpty returns a bool. Ergo...

keywordsComboBox.DataSource = db.Books.Select(c=> !string.IsNullOrEmpty(c.Keywords))

I know the language. I've read a book. - _Madmatt

Sundeepan Sen4-Feb-10 18:26

Sundeepan Sen

4-Feb-10 18:26

Hello all, my name is Sundeepan and I am new to this board and to coding as well. To train myself and get familiar with OOP concepts using the C# language I am reading, "Microsoft .NET Framework - Application Development Foundation" book by Tony Northrup. I am finding this book very informative. I do have a question that I was not able to find an answer to by querying Google. The question is as follows:

If a method requires an object as one of its parameters why should one not pass an object of a base class, instead one must pass an object of the derived class?

I understand that this might be a foolish question, but I am at a very early stage of my learning, any help would be appreciated. Metaphors are equally as helpful as a technical answer.

Regards

Sundeepan

http://sundeepinthought.blogspot.com

modified on Friday, February 5, 2010 12:32 AM

Not Active4-Feb-10 20:07

4-Feb-10 20:07

class Animal
{
   protected void Foo(){}
}

class Cow : Animal
{
   public vod Moo(){}
}

class Farm
{
   public void Pet(Animal animal){}
}

If you pass Animal to a method then you can only access the Foo method. However, if you pass Cow, you will have access to both Moo and Foo methods since Cow derives from Animal.

I know the language. I've read a book. - _Madmatt

Sundeepan Sen4-Feb-10 20:28

Sundeepan Sen

4-Feb-10 20:28

So if I wrote

class Farm
{
    public void Pet(Cow chicken){}
}

I can access both Foo and Moo?

But if I wrote

 class Farm
{
    public void Pet(Animal man){}
}

then I can only access the Foo method?

Lol..nice example though....clarification is needed if you don't mind Big Grin | :-D

Wamuti4-Feb-10 21:58

Wamuti

4-Feb-10 21:58

sundeepan wrote:
Cow chicken

and

sundeepan wrote:
Animal man

was a really comical. Laugh | :laugh:

Anyway i don't see any clarification to make since it is just as you say. When you inherit, you get the members you inherit and in addition any member you make in the new class. Just like if someone left you some items to travel to an unknown land ( Dead | X|

) then, you'd have the items you originally owned plus the ones he left you. But he would not have the items you own since you never gave it to them.

Wamuti: Any man can be an island, but islands to need water around them!
Edmund Burke: No one could make a greater mistake than he who did nothing because he could do only a little.

PIEBALDconsult5-Feb-10 3:19

PIEBALDconsult

5-Feb-10 3:19

sundeepan wrote:
why should one not pass an object of a base class

Who says you shouldn't? There are many cases where you would.

Sundeepan Sen5-Feb-10 7:04

Sundeepan Sen

5-Feb-10 7:04

This is the paragraph that threw me off:

"Another benefit of inheritance is the ability to use derived classes interchangeably, a concept called polymorphism. For example, there are five classes that inherit from the System.Drawing.Brush base class: HatchBrush, LinearGradientBrush, PathGradientBrush, SolidBrush, and TextureBrush. The Graphics.DrawRectangle method requires a Brush object as one of its parameters however, you never pass an object of the base Brush class to Graphics.DrawRectangle. Instead you pass an object of one of the derived classes. Because they are each derived from the Brush class, the graphics.DrawRectangle method can accept any of them. Similarly if you were to create a custom class derived from the Brush class, you could also pass an object of that class to Graphics.DrawRectangle. "