Hi, I has a diagram, and use ExportToImage method to export to png, but the png file is 0KB, and can't diaplay in windows photo viewer, why?

The code is:

namespace OpenDiagramdemo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public RadDiagram diagram;
        public MainWindow()
        {
            InitializeComponent();
            diagram = new RadDiagram();
            //the shapes up to 500, display is slow
            for(int i = 0; i < 1000; i++)
            {
                RadDiagramShape s = new RadDiagramShape();
                s.Stroke = Brushes.Red;
                s.BorderBrush = Brushes.Red;
                s.StrokeThickness = 2;
                s.IsEditable = false;
                s.Foreground = Brushes.Transparent;
                s.Background = Brushes.Transparent;
                s.Width = 113;
                s.Height = 76;
                s.X = i;
                s.Y = i;
                s.Geometry = ShapeFactory.GetShapeGeometry(CommonShapeType.EllipseShape);//"M0.5,0.5L111.5,0.5 111.5,74.5 0.5,74.5z"
                diagram.AddShape(s);
            }
        }
       
        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            FileStream fs = File.Open("D:\\\\tt.png", FileMode.Create);
            this.diagram.ExportToImage(fs);
            fs.Close();
        }
    }
}

When run this program, make a diagram And draw a menu in xaml. Define the menu click event MenuItem_Click. Click menu and see the result described above.

Thanks!

Hi, I have problem with RadialGauge. When I set BarIndicator value = 100 and it disappear. Please help me!

Hey community,

the row redorder sample doesn't work within a RadLayoutControl. It looks like as if the RadLayoutControl would intercept the DragEvent, so the  GiveFeedbackEventArgs is not called within the RowReorderBehavior.

Can you provide me a sample or give me a hint please.

Kind regards,

Lars

I am using a radGridView in Master/Detail scenario using MVVM; the selected item is displayed in a custom form that allows editing.
The Form's DataContext and the Grid's SelectedItem are bound to a property in the ViewModel.
When the Grid's selection is changing, I check if the Form is in Edit mode, and if so I cancel the selection change.

This works as it should.

However, there are some circumstances where the Grid's ItemSource (CollectionViewSource) changes and the Grid looses track of the SelectedItem. I can throw NotifyPropertyChanged on the property, and the grid doesn't notice. When the grid is in this state and the user selects a row, the logic in SelectionChanging does not prevent the SelectedItem from changing. In fact it sets the SelectedItem to null, rather than the attempted selection row.

I really need to prevent the SelectedItem from changing (or becoming null) while the item is being edited. I think the best way would be to prevent the grid from getting into this strange state.

How can I force the grid to realize its SelectedItem, if NotifyPropertyChanged is not doing the trick?

Does the grid loose its SelectedItem binding when the Itemssource updates?

XAML:
    <telerik:RadGridView Grid.RowSpan="2" ShowGroupPanel="False" AutoGenerateColumns="False" IsFilteringAllowed="False"
        ItemsSource="{Binding Zones.View}"  x:Name="grd_ZoneBins" IsReadOnly="True" EditTriggers="None"
        SelectedItem="{Binding SelectedZone, Mode=TwoWay}"
        SelectionChanging="grd_ZoneBins_SelectionChanging" >
        <telerik:RadGridView.Columns>
            <telerik:GridViewDataColumn Header="Zone" DataMemberBinding="{Binding Name}" Width="*" />
            <telerik:GridViewDataColumn Header="Active" DataMemberBinding="{Binding IsActive}" />
        </telerik:RadGridView.Columns>
    </telerik:RadGridView>

CodeBehind:
    private void grd_ZoneBins_SelectionChanging(object sender, Telerik.Windows.Controls.SelectionChangingEventArgs e)
    {
        if (EditableWorkSpace_ZoneBins.Mode == EditMode.Editable) //this is a custom control
            e.Cancel = true;
    }

ViewModel:
    //Properties
    private List<Part_Zone> _zones;
    public CollectionViewSource Zones { get; set; }
    private Part_Zone m_SelectedZone;
    public Part_Zone SelectedZone
    {
        get { return m_SelectedZone; }
        set { m_SelectedZone = value; NotifyPropertyChanged("SelectedZone");}
    }

    public Model() //constructor
    {
        Zones = new CollectionViewSource();
        Zones.SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));
        LoadData();
    }

    private void LoadData()
    {
        _zones = GetZones();
        Zones.Source = _zones;
        SelectedZone = Zones.View.CurrentItem as Part_Zone; //first item
    }

    public void Refresh()
    {
        LoadData();
        //at this point the grid doesn't seem aware that the SelectedZone is its SelectedItem
    }

    public void StartEdit()
    {
        View.EditableWorkSpace_ZoneBins.Mode = EditMode.Editable;
        NotifyPropertyChanged("SelectedZone"); // just in case
    }

Steps to reproduce:
1) load data
2) select item in grid
3) refresh data - grid looses selectedItem. SelectedZone is not null.
4) start edit
5) change selection - gets canceled due to Edit mode
6) SelectedZone is set to null.

Dear Admin

I just use RadGridView control for excel content shown in MVVM pattern, and before amount excel data, I do not know exact columns and rows shown in RadGridView, so I use datatable as my datasource binded to RadGridView's ItemsSource. But actually I would like to change some columns  datatype from string to Image, I try to add AutoGeneratingColumn event and set CellTemplate for specified columns, and the result was that there was no response after loading and only shut-down whole window.

so in this case is there any other workaround to archive similar case? any ideas I do really appreciate.

Hello,

I have a combobox on which i am trying to modify the default tooltip style.This is applicable when I am hovering on individual combobox items and I should get the tooltip. Right now for tooltip , we are showing up the text value. But I want to override this deafult style and show the description instead. (Note that description is a user defined property).

The code snippet right now is:

<Style.Resources>
            <Style TargetType="{x:Type ComboBoxItem}" BasedOn="{StaticResource ComboBoxItemStyle}">
                <!--<Setter Property="ToolTip" Value="{Binding ToolTipDescription, Mode=TwoWay}"/>-->
                <Setter Property="ToolTip" Value="{Binding}"/>
            </Style>
        </Style.Resources>

Here while setting the property "tooltip" <Setter Property="ToolTip" Value="{Binding ToolTipDescription, Mode=TwoWay}"/>. I tried doing something like this. Here I exposed a public property from my class which is holding the description value that I need to show when i am hovering on the individual item. But the binding is not working.

I need your input to proceed further.

A pair of RadTimePickers I have for selecting the beginning and end of a shift are displaying the timeview incorrectly after being enabled and having the starttime and endtime values set. They both show every slot from 12AM to 11:45PM, but starting with 12AM selecting a slot displays the value that SHOULD be seen, 8:30AM in this case, and continues for each subsequent slot in the same manner until the endtime slot, whose correct value is 5:15PM at the 8:45AM slot on the selection view. When the binding event is called a second time, the timeviews for both RTPs are correctly shown, going from 8:30AM to 5:15PM. HTML markup of the RTPs in question as follows, as well as the code-behind for the binding event.

Page_Load contains Page.DataBind(); which appears to be the cause. Do I have to do without it or is there a workaround?

However, I am not able to use the GetProperty method for control specific properties, i.e. "ItemState" on a RadTileViewItem. I am able to find the item and for example draw a highlight around it, but trying to get it's TileState results in a NotSupportedException:

GetProperty of "TileState" is not supported on control type: Custom

What seems strange: If I start the coded ui test builder and pull the crosshair over the TileViewItem, I can see it's TileState property and the correct value. Only the test playback is not able to retrieve it.

Am I missing something important to make the uitest extension working?