WPF Discussion Boards

Re: Changing Cell Color dynamically in Datagrid using C#.net

10-Jul-12 23:55

OK, this is fairly simple to achieve with the use of a Timer, a public property and a value converter. What you need to do is create a property that you will bind to as part of the collection that you are binding your DataGrid against. The timer will be used to change the value of the property.

The value converter simply converts this value into an appropriate colour. Your Background will be bound to the property, and you will use the value converter as your converter.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Mycroft Holmes11-Jul-12 1:02

Mycroft Holmes

11-Jul-12 1:02

Oh I know start the timers slightly offset on each record. Duck dodge weave rock hide under!

Never underestimate the power of human stupidity
RAH

Re: Changing Cell Color dynamically in Datagrid using C#.net

Pete O'Hanlon11-Jul-12 1:04

Re: silverlight databinding

11-Jul-12 1:04

Mycroft Holmes wrote:
Oh I know start the timers slightly offset on each record. Duck dodge
weave rock hide under

Or just use one timer and update ALL records. I prefer your solution though.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

silverlight databinding

Bhushan futane10-Jul-12 19:04

Bhushan futane

10-Jul-12 19:04

hiii..
can any one tell me how to make batabse connectivty wid controls lik datagrid....

Abhinav S10-Jul-12 19:44

Abhinav S

10-Jul-12 19:44

Try http://beyondrelational.com/modules/2/blogs/433/posts/12021/different-ways-to-bind-data-grid-in-silverlight.aspx[^].
You can also always check out the msdn site.

Build your own survey - http://www.factile.net

Make a textbox act like Excell Cell

Vimalsoft(Pty) Ltd9-Jul-12 7:29

9-Jul-12 7:29

Hi All

i am converting an Excell spreadsheet into an application. So i am doing automatic calculations like Excell do , for some of the cells(textbox) should allow a user to enter the minus sign "-" , and this automatically minus value entered. So my issue here is if th the users enters that character it breaks my app's calculations. Does anyone have any idea how to bypass this ?

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

Pete O'Hanlon9-Jul-12 7:57

9-Jul-12 7:57

Vuyiswa Maseko wrote:
So my issue here is if th the users enters that character it breaks my app's
calculations. Does anyone have any idea how to bypass this ?

Without knowing how your application works, no. I don't know what code you've actually written, so how can I tell you what's wrong with it. I will say one thing though - if you can cope with positive numbers, you should be able to cope with negative ones. After all, taking away is merely adding a negative number.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Vimalsoft(Pty) Ltd9-Jul-12 8:20

9-Jul-12 8:20

hi Pete

Thanks for your reply. i am just looking at ideas without any coding examples. What i need is a logic to bypass this.

lets take a Cell in an Excel spreadsheet,you normally can enter numeric values and by default anything that has no sign "-" is a "+" so now when it comes to negative in Excel it will subtract the value in the cell from somewhere. So in .e.g asp.net or silverlight , if you want to mimic that Excel behavior how can do that , because immediately when that value is entered it changes the data in the textbox not to fall under "int" or "decima" because there is a special character.

You know what ?

i just Figured out.

i will keep the value as is and when it is being calculated against another Field , i will sum what needs to be summed and subtract on any field that has that sign

Sometimes when you explain the problem to someone you might find the solutiion

Thanks

Pete O'Hanlon9-Jul-12 8:44

9-Jul-12 8:44

Vuyiswa Maseko wrote:

Sometimes when you explain the problem to someone you might find the
solutiion

Often the way my friend, and a 5 for such enlightenment.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Vimalsoft(Pty) Ltd9-Jul-12 8:53

9-Jul-12 8:53

PaulLinton16-Jul-12 20:11

PaulLinton

16-Jul-12 20:11

Are you aware of this article A Calculation Engine for .NET[^]

Vimalsoft(Pty) Ltd18-Jul-12 22:34

Re: Write Comments on Image

18-Jul-12 22:34

Thanks nice

Write Comments on Image

varaprasad20209-Jul-12 3:59

varaprasad2020

9-Jul-12 3:59

How to Comments on image at dynamically write sometext
on image in Silverlight.

Pete O'Hanlon9-Jul-12 4:15

Re: Write Comments on Image

9-Jul-12 4:15

If you just want to display dynamic text over the top of an image that is displayed in the UI, you simply need to place a TextBlock on top of the image and set the Text as appropriate.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

vinodkrebc9-Jul-12 8:22

vinodkrebc

9-Jul-12 8:22

<Grid>
<Image source=""/>
<TextBox Text="Enter comments here.." VerticalAlignment="Center"/>
</Grid>

The above code will put a TextBox in the center of the image where you can enter your comments. Further if you want to have an image with commented text that also you can create a dynamic Bitmap image.

Cheers!
Vinod

http://www.exploresilverlight.com
Cheers!
Vinod

Immage Annotation

varaprasad20209-Jul-12 3:57

varaprasad2020

9-Jul-12 3:57

How To create Image Annotation in Silverlight,Please
Help me.

Working with WPF Web browser control

AshishGoyal086-Jul-12 0:46

AshishGoyal08

6-Jul-12 0:46

Can someone atleast help me to find the mouse pointer location over the webbrowser control in WPF.
The only constraint is that you cannot create an event of the webbrowser control.

And just for the records,

Point p = Mouse.GetPosition(webBrowser1);

is not working !

Re: Working with WPF Web browser control

darshan_ur12-Jul-12 2:06

darshan_ur

12-Jul-12 2:06

You can get the Mouse Pointer as bellow:

Point p = this.PointFromScreen(Mouse.GetPosition(this));
txtX.Text = p.X.ToString();
txtY.Text = p.Y.ToString();

Accept Button and Data Binding inconsistency

Bernhard Hiller4-Jul-12 23:11

Bernhard Hiller

4-Jul-12 23:11

It is convenient to have an "Accept Button" (in WPF: IsDefault="True") on a Form.
In the Windows Forms world, I used to read the data from the UI to the object(s) in the corresponding Click event of the button.
But with WPF, data binding ought to be used. In the constructor of the Window, I set this.DataContext = test;
And here comes the problem: the user entered some text in TextBox2, and hits the Enter key. Now, the command bound to the OK button gets executed, the data are saved.
But it is not the correct data! Why? TextBox2 has not yet lost focus, and consequently the ViewModel has not yet been updated.
[Edit]In Windows Forms, several controls have a Validating event. That event gets fired before the Click event event of the button, though the focus remains on that element.[/Edit]
How do you overcome such a problem?

modified 5-Jul-12 6:01am.

Wayne Gaylard4-Jul-12 23:20

Wayne Gaylard

4-Jul-12 23:20

You should set the TextBox's UpdateSourceTrigger property to PropertyChanged and then it will automatically update the ViewModel whenever any changes are done to the text. Something like this :-

HTML

Text="{Binding Path=yourTextProperty, UpdateSourceTrigger=PropertyChanged}"

By default this property is set to LostFocus, which only updates the property when the user moves focus to another control.

Hope this helps.

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

Bernhard Hiller4-Jul-12 23:22

Bernhard Hiller

4-Jul-12 23:22

Thanks for the idea. But it is not only one text box. The user can hit the Enter key anywhere. And on every form with an accept button. This means that a general solution is required.

Abhinav S4-Jul-12 23:23

Abhinav S

4-Jul-12 23:23

You can use UpdateSourceTrigger=”OnPropertyChanged” as a workaround to help you fix this in some scenarios.
Otherwise, its a WPF bug.

Check this post[^] out as well.

Build your own survey - http://www.factile.net

Bernhard Hiller4-Jul-12 23:36

Bernhard Hiller

4-Jul-12 23:36

That link is very interesting. I have checked with a Windows Forms application (also .Net 4, Visual Studio 2010): the Leave event (corresponding to LostFocus) does not happen when the user hits the Enter key. That means, this behavior is consistent between Windows Forms and WPF. Only due to DataBinding, a problem arises.
[Edit]Test with C# 2005 Express, .Net 2: same behavior[/Edit]

modified 5-Jul-12 5:45am.

Pete O'Hanlon5-Jul-12 0:30