Silverlight ComboBox Binding Issue [modified] - WPF Discussion Boards

30-Dec-09 5:44

Hey,

I want to have some surface on which the user can click, after which I get the coordinates so I can store them somewhere, and draw something on that location.

I've found ways to let a user draw on something, but not how to effectively get the coordinates. This is vital for the application I want to create though.

This is a C# application working with .Net 4.0 beta 2 and a WPF interface.

Any pointers or suggestions in the good direction are welcome - I really want to start with the real work on that app Smile | :)

Cheers!

Jeroen De Dauw
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Forums ; Blog ; Wiki
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ProtoBytes30-Dec-09 6:47

30-Dec-09 6:47

This article (demo) here at The Code Project probability has every example you are looking for. It's a really nice diagramming application in the works.

WPF Diagram Designer - Part 2[^]

Mark Salsbery30-Dec-09 7:18

Mark Salsbery

30-Dec-09 7:18

jeroen de dauw wrote:
how to effectively get the coordinates

When handling mouse events, you can use the GetPosition() method
on the MouseEventArgs/MouseButtonEventArgs object to get the
coordinates relative to an element.

You can also use System.Windows.Input.Mouse.GetPosition() to
get the current coordinates relative to an element.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Jeroen De Dauw30-Dec-09 9:37

30-Dec-09 9:37

Hey guys,

I did search for such a method, and didn't find one. Guess why...

Somehow I managed to click the KeyDown event instead of the MouseDown one OMG | :OMG:

Anyway, thanks for the helping Smile | :)

Cheers!

Jeroen De Dauw
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Jeroen De Dauw30-Dec-09 12:00

30-Dec-09 12:00

I'm probably doing something stupid wrong here, but my event handler for the MouseDown event is not getting called when I click on my canvas. Anyone an idea what I'm messing up?

Curious if I'm failing at C# or at WPF here Smile | :)

Cheers!

Jeroen De Dauw
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Jeroen De Dauw31-Dec-09 7:52

Silverlight ComboBox Binding Issue [modified]

31-Dec-09 7:52

Found the solution here: http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/9c8dd0c7-79fc-4de3-a116-acde79314c1e[^]

Jeroen De Dauw
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Programm3r30-Dec-09 2:18

Programm3r

30-Dec-09 2:18

Hi all,

I am making use of a DataForm to display my data. I have made use of the DataForm edit template to customize the layout of the form. Data is returned and is being displayed within the DataForm. The problem is that, as soon as I start navigating (2 navigation clicks) with the DataFrom, only the ComboBox 'looses' it's binding on the SelectedItem (although it's selected item was data bound and then it just goes blank Confused | :confused:

).

The back end code consists of a generic list List<string> and a string variable that has the value of each data item that is returned.

..
public List<string> Category { get; set; }
public string CategoryName { get; set; }
..

The XAML code:

...
<dataFormToolkit:DataField DescriptionViewerPosition="Auto" LabelPosition="Left" LabelVisibility="Visible" Label="Category">
    <ComboBox ItemsSource="{Binding Category}"  SelectedItem="{Binding CategoryName, Mode=TwoWay}" />
</dataFormToolkit:DataField>
...

Any reason why this is happening and how I can fix it?
Many thanks in advance.
Kind regards

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

modified on Wednesday, December 30, 2009 8:36 AM

Re: Silverlight ComboBox Binding Issue

MikeGoatly3-Sep-10 5:14

MikeGoatly

3-Sep-10 5:14

Hey. This problem has been bugging me a lot lately - Something really odd is happening in the framework. What's happening is the data field control is modifying the bindings on the control and re-setting them. Setting the SelectedItem works fine, but when it comes to re-set the ItemsSource property the binding for the *SelectedItem* property *vanishes* without a trace.

The only workaround I have at the moment is to make the ItemsSource binding TwoWay, and ensuring that the property it's bound to is read-only. This stops the code from modifying the ItemsSource binding.

However, I'm now finding that the bindings are disappearing under other circumstances as well (it looks like it's happening occasionally when there is more than 1 combo box in the form) - I haven't solved that one yet.

Cheers,
Mike

WndProc equivalent in WPF?

pbalaga29-Dec-09 10:41

pbalaga

29-Dec-09 10:41

Is there a single method in WPF that can handle all types of input at once, like WndProc in Windows Forms? Or do I have to capture and forward each event separately?

Re: WndProc equivalent in WPF?

ProtoBytes29-Dec-09 11:23

Re: WndProc equivalent in WPF?

29-Dec-09 11:23

Hmm... I never knew there was such a thing for WinForms.

Good Question.

teejayem29-Dec-09 12:20

teejayem

29-Dec-09 12:20

Badda Bam![^]

Don't be overcome by evil, but overcome evil with good

Re: WndProc equivalent in WPF?

pbalaga29-Dec-09 23:12

pbalaga

29-Dec-09 23:12

Thanks for your reply.

Of course, it should do the job. Anyway, it seems to be a pretty strange work-around. You're provided with dozens of overridable methods for handling input, but you have to use native hooks...

why Scrollviewer clip content in wpf

wasimsharp28-Dec-09 23:08

wasimsharp

28-Dec-09 23:08

Hi friend
can any body tell me why ScrollViewer Clip its content. is set CliptoBound property to false.
any body new any solution for it.

WANTED wasim khan(Killed 50 Innocent Buggs, Distroyed 200 Exception, make 5 Project Hostage) any Compnay Hire him will pay 30,000. Best place where u can get him is Sorcim Technologies Murre Road RWP

Re: why Scrollviewer clip content in wpf

Mark Salsbery29-Dec-09 10:26

Mark Salsbery

29-Dec-09 10:26

wasimsharp wrote:
why ScrollViewer Clip its content

That's the way the ScrollViewer is designed to work.
The ScrollViewer uses a fixed-size viewport to view a
portion of the scrollable content.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Do you know any ListViewItem samples in WPF?

Mohammad Dayyan28-Dec-09 16:48

Mohammad Dayyan

28-Dec-09 16:48

Hi guys.
I'm looking for a sample of ListView that contains some ListViewItems in XAML code.
I have been searching the web but I couldn't find any useful sample !

Could you guide me ?
Thanks.

Re: Do you know any ListViewItem samples in WPF?

ProtoBytes29-Dec-09 9:32

Re: Do you know any ListViewItem samples in WPF?

29-Dec-09 9:32

As I stated in the other thread:

try google:

'ListView ListViewItem XAML .NET site:msdn.com'

Mohammad Dayyan29-Dec-09 22:50

Mohammad Dayyan

29-Dec-09 22:50

Thanks TheArchitectmc∞ , I've done it former, but I couldn't find anything special.

pcmedia28-Dec-09 16:05

pcmedia

28-Dec-09 16:05

how can login authentication (use windows media service 2008) in silverlight 3

Re: login authentication in silverlight 3

Abhinav S28-Dec-09 16:28

Abhinav S

28-Dec-09 16:28

Are you talking about IIS media services?
Link here [^].

There's nothing left in my right brain and nothing right in my left brain.

Data class implementations not fully passed to Silverlight?

Michael Eber28-Dec-09 11:56

Michael Eber

28-Dec-09 11:56

Here is my scenario:
Data Layer : running as an simple web service as required by Silverlight
Entities are generated from the database tables
An extended class is defined with the following additions:

public partial class CustomerMaster
{
    public override string ToString( )
    {
        return this.CustomerName;
    }
}
public partial class CustomerLocation
{
    public override string ToString( )
    {
        return this._LocationID;
    }
}

CustomerMaster and CustomerLocation are two entities derived from the database.

Silverlight side

When I get my data I bind a list box to the result of my async query.

I get the list of customers no problem.
But listbox calls ToString() on my objects and I'm getting the default behaviour (namespace) not my overridden code!!!???

Anyone know a reason why this would happen?

Re: Data class implementations not fully passed to Silverlight?

Abhinav S28-Dec-09 16:42

Abhinav S

28-Dec-09 16:42

Methods are not part of the DataContract so they won't be available when you create the proxy for the client.

There's nothing left in my right brain and nothing right in my left brain.

Re: Data class implementations not fully passed to Silverlight?

Michael Eber30-Dec-09 11:28

Michael Eber

30-Dec-09 11:28

yeh...found I had to specify the field in the data to display within the properties.

grid in 3D Environment

sajib_bd26-Dec-09 20:03

sajib_bd

26-Dec-09 20:03

how can i draw grid in 3D environment using wpf (suppose i want to draw i room using line)

Re: grid in 3D Environment

ProtoBytes28-Dec-09 12:06