Questions on UI for WPF Forum

1 answer

114 views

Update Radchart Seriesmappings and Itemsource using MVVM Backgroundworker

Hello,

I have a WPF application which incorporates the MVVM pattern. I have a viewmodel class which basically has two properties:

01.private SeriesMappingCollection _mapCollection;

02.private ArrayList _joints;

03.public SeriesMappingCollection MapCollection

04.{

05. get { return _mapCollection; }

06. set

07. {

08. if (_mapCollection != value)

09. {

10. _mapCollection = value;

11. OnPropertyChanged("MapCollection");

12. }

13. }

14.}

15.

16.public ArrayList Joints

17.{

18. get { return _joints; }

19. set

20. {

21. if (_joints != value)

22. {

23. _joints = value;

24. OnPropertyChanged("Joints");

25. }

26. }

27.}

The values of Mapcollection and Joints are set using a BackgroundWorker. When the data has been fetched, the GetAlertCompleted function is fired and the Mapcollection and Joints properties are set. This consequently fires the OnPropertyChanged() function of the view model

01.public ViewModel()

02.{

03. workerAlerts = new BackgroundWorker();

04. workerAlerts.DoWork += (o, args) => args.Result =

05. VizBackend.GetAlert.(_ipAdd,_selectedPeriod);

06.

07. workerAlerts.RunWorkerCompleted += GetAlertCompleted;

08.}

09.

10.private void GetAlertCompleted(object sender, RunWorkerCompletedEventArgs e)

11.{

12.

13. var alertData = e.Result as AlertData;

14. Joints = alertData.Joints;

15. MapCollection = alertData.MapCollection;

16. }

And in the main window I have:

01.private readonly ViewModel vm;

02.vm = (ViewModel)DataContext;

03.vm.PropertyChanged += VmPropertyChanged;

04.

05.private void VmPropertyChanged(object sender, PropertyChangedEventArgs e)

06. {

07. switch (e.PropertyName)

08. {

09. case "MapCollection":

10. this.radChart.SeriesMappings = vm.MapCollection;

11. break;

12.

13. case "Joints":

14. this.radChart.ItemsSource = vm.Joints;

15. break;

16. }

17. }

The problem is that when I assign the first property of the RadChart ( for example ItemsSource), I cant set the SeriesMappings property and I receive this error "The calling thread cannot access this object because a different thread owns it". I have no idea why this error is being raised. If I can set one property, why cant I set the second one. And it also doesnt matter in which order they are assigned. Once the first is assigned, I get an error for the second one.

I would appreciate if you could point out where the problem might be. Thanks.

Chart

answered on 29 Sep 2010

1 answer

129 views

Sample code for printing WPF grid data

Hi,

Can you please share sample code for printing WPF grid data using c#.

I tried the online demos avaliable at telerik site for GridView, it is showing "Example not supported in XBAP enviornment". I've tried silverlight code but showing errors.

Thanks,
-Narendra

GridView

answered on 29 Sep 2010

3 answers

150 views

IsNull or IsNotNull

Is there a way to filter by nulls ?

Thanks !

DataFilter

answered on 29 Sep 2010

1 answer

97 views

Display row count on raddatapager

Hello,

I am trying to display the row count on the raddatapager instead of footer. Is this possible? If so, is there an example somewhere?

Thank You in advance,
Kal

GridView

answered on 29 Sep 2010

1 answer

206 views

Display Row Count on RadDataPager

Hello,

I am trying to display the row count on the raddatapager instead of footer. Is this possible? If so, is there an example somewhere?

Thank You in advance,
Kal

DataPager

answered on 29 Sep 2010

1 answer

102 views

Column names when using DataTable as ItemsSource

Hi,

I am testing RadGridView control for our needs. I bind a DataTable instance to the control but the column names of the control are empty. AutoGenerateColumns property is set to true. I want to set the column names of the DataTable instance to the grid control.

Thank you.

GridView

answered on 29 Sep 2010

11 answers

174 views

the filter menu is clipped

Hello :)

I have a gridview and the filter menu is clipped, the "Filter" and "ClearFilter" buttons are not shown.
I have attached a screenshot of this.

I hope you can help me.
Best regards
Jorge

GridView

answered on 28 Sep 2010

7 answers

430 views

binding to a list within list

I have a very simple problem. I have a list of cars and each car can further contain its name and a list of parts that consist the car. Now i want to show the cars(names) in a grid and the corresponding parts in a combobox in the same row using GridViewComboBoxColumn.
I have set the itemsource property of grid to Cars. Then i used the GridViewDataColumn's unique name to display the name and item source property of GridViewComboBoxColumn to display parts. Here is the code

<

telerik:RadGridView Name="UserListGrid" DockPanel.Dock="Top" Height="520"

ScrollMode="RealTime"

UseAlternateRowStyle="True"

AutoGenerateColumns="False"

ShowGroupPanel="False"

IsReadOnly="False"

RowIndicatorVisibility ="Visible"

CanUserFreezeColumns="False"

SelectionMode="Single"

ItemsSource="{Binding OperatorInfoItems, Mode=TwoWay}"

SelectedItem="{Binding SelectedRow, Mode=TwoWay}"

IsSynchronizedWithCurrentItem="True"

SelectionChanged="UserListGrid_SelectionChanged">

<telerik:RadGridView.Columns>

<telerik:GridViewDataColumn UniqueName="Cars" DataType="{x:Null}" Header="Names" IsVisible="True" IsFilterable="False" IsGroupable="False" IsReadOnly="True" IsSortable="False" Width="150"/>

<telerik:GridViewComboBoxColumn ItemsSource="{Binding Parts}" Header="Parts"/>

</telerik:RadGridView.Columns>

</telerik:RadGridView>

But after running the project i could only see names and a data binding error message instead of a populated combobox.
Pl tell me what to do.

GridView

answered on 28 Sep 2010

5 answers

842 views

button content with a combination of the image

Hi telerik,
as part of my custom control development for button control, i need to have a button content with a combination of the image
and a text (side by side). i need to change the image to a different image when i place my cursor on to the button and change to
original image when the mouse leaves the control.

how to acheive this in generic.xaml and my cs file?

Regards,
srinivas J

Buttons

answered on 28 Sep 2010

1 answer

153 views

RadMap - DynamicLayer performance problem

Hi,
I was trying to use the dynamic layer and my goal was to only get items within the viewport. My data is stored with a quadkey up to lever 2^14 and because of that  I need to set the ZoomGrid to 2^level * 2^level cells.
    Looking with reflector in the the DynamicLayer code I've realized that the call back for getting the items for a particular cell is iterating through the entire cell set rather than being restirected to the one in the view.
This is obviously causing the application to freeze on high levels(9+). Am I missing something in my implementation?
   Are there any plans to introduce a DynamicLayer class that is similar with the Bing Tile system? I would take any beta version into consideration as where I am standing now I have to implement my own. Please advise!
Regards,
Dan

Map

answered on 28 Sep 2010