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How to add a separator to a WPF combobox that is databound?


How to add a separator to a WPF combobox that is databound?

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How to add a separator to a WPF combobox that is databound?
Tag : chash , By : Fahad
Date : November 24 2020, 05:44 AM


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AutoComplete for a WPF editable ComboBox including Separator control shows System.Windows.Controls.Separator


Tag : wpf , By : Priya
Date : March 29 2020, 07:55 AM
hop of those help? Using the items collection to introduce something which looks like a header is probably not such a good idea, you will run into all kinds of problems including this one. You might be better of creating a custom Template for the ComboBox or a custom control altogether which provides properties for this functionality.

Insert separator (blank line) in databound flowdocument


Tag : wpf , By : keird
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , In my MVVM WPF application I'm using a databound flowdocument. I used the technique described here to be able bind my data to the flowdocument. My flowdocument is bound to a public property in my viewmodel. The property is an ienumerable of a custom type, like this: , In order to group your data, use a CollectionViewSource like this:
<Window.Resources>
    <CollectionViewSource x:Key="groupView" Source="{Binding Path=Persons}">
        <CollectionViewSource.GroupDescriptions>
            <PropertyGroupDescription PropertyName="Code"/>
        </CollectionViewSource.GroupDescriptions>
    </CollectionViewSource>
</Window.Resources>
<Grid>
    <FlowDocumentScrollViewer>
        <FlowDocument>
            <flowdoc:ItemsContent ItemsSource="{Binding Source={StaticResource groupView}}">
               ....
            </flowdoc:ItemsContent>
        </FlowDocument>
    </FlowDocumentScrollViewer>
</Grid>
private void GenerateContent(DataTemplate itemsPanel, DataTemplate itemTemplate, IEnumerable itemsSource)
{
    Blocks.Clear();
    if (itemTemplate != null && itemsSource != null)
    {
        FrameworkContentElement panel = null;

        if (panel == null)
        {
            if (itemsPanel == null)
            {
                panel = this;
            }
            else
            {
                FrameworkContentElement p = Helpers.LoadDataTemplate(itemsPanel);
                if (!(p is Block))
                {
                    throw new Exception("ItemsPanel must be a block element");
                }
                Blocks.Add((Block)p);
                panel = Attached.GetItemsHost(p);
                if (panel == null)
                {
                    throw new Exception("ItemsHost not found. Did you forget to specify Attached.IsItemsHost?");
                }
            }
        }

        // *** START NEW CODE ***
        ICollectionView view = itemsSource as ICollectionView;
        if (view != null)
        {
            foreach (object group in view.Groups)
            {
                GenerateContentForUngroupedItems(itemsPanel, itemTemplate, ((CollectionViewGroup)group).Items, panel);
                if (panel is TableRowGroup)
                {
                    TableRow row = new TableRow();
                    row.Cells.Add(new TableCell());
                    ((TableRowGroup)panel).Rows.Add(row);
                }
            }
        }
        else
        {
            GenerateContentForUngroupedItems(itemsPanel, itemTemplate, itemsSource, panel);
        }
        // *** END NEW CODE ***
    }
}

private void GenerateContentForUngroupedItems(DataTemplate itemsPanel, DataTemplate itemTemplate,
                                                IEnumerable itemsSource, FrameworkContentElement panel)
{
    foreach (object data in itemsSource)
    {
        FrameworkContentElement element = Helpers.LoadDataTemplate(itemTemplate);
        element.DataContext = data;
        Helpers.UnFixupDataContext(element);
        if (panel is Section)
        {
            ((Section) panel).Blocks.Add(Helpers.ConvertToBlock(data, element));
        }
        else if (panel is TableRowGroup)
        {
            ((TableRowGroup) panel).Rows.Add((TableRow) element);
        }
        else
        {
            throw new Exception(String.Format("Don't know how to add an instance of {0} to an instance of {1}",
                element.GetType(), panel.GetType()));
        }
    }
}
TableRow row = new TableRow();
row.Cells.Add(new TableCell());
((TableRowGroup)panel).Rows.Add(row);

Accessing ComboBox.Items with Contains method for DataBound ComboBox


Tag : chash , By : terrestrial
Date : March 29 2020, 07:55 AM
like below fixes the issue What you're actually trying to determine is whether the displayed text of any item matches some other value. To get the displayed text of an item you call GetItemText. I'll post an example.
Here's an extension method that will do the job:
Imports System.Runtime.CompilerServices

Public Module ComboBoxExtensions

    <Extension>
    Public Function ContainsItemText(source As ComboBox, itemText As String) As Boolean
        Return source.Items.Cast(Of Object).Any(Function(item) source.GetItemText(item) = itemText)
    End Function

End Module

C# WinForms - filtering one combobox based on the value of another combobox in a databound datagridview


Tag : chash , By : Gazza
Date : March 29 2020, 07:55 AM

Combobox with separator opening at the position of the separator


Tag : wpf , By : PPD
Date : March 29 2020, 07:55 AM
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