Questions on UI for WPF Forum

1 answer

199 views

How to show unchecked checkbox instead of x when binding value is null?

Hello,

I have a checkbox in a Telerik GridViewDataColumn with its IsChecked binding set to a data source that could be 1, 0, or Null.

When the value of the data element is 1, it displays a check.

When the value of the data element is 0, it displays an unchecked checkbox.

But when the value of the data element is Null, it displays an X. That's an issue.

How can I change the display to also show an unchecked checkbox when the value is Null? (It needs to look the same way that it looks when the data element value is 0)

Thank you!

GridView

answered on 18 Jan 2022

1 answer

127 views

Will RadDataServiceDataSource be compatible with Restier?

I am currently trying to build a data service currently using .net core 5 and plan to use the RadDataServiceDataSource tool to connect the front end. While setting it up, I noticed that WCF Data Services are deprecated and Microsoft says to use Restier. Is this compatible with your tools? Also, if it is, is there any working examples of this?

DataServiceDataSource

answered on 18 Jan 2022

1 answer

458 views

Auto Complete Box - SelectedItem not getting selected when typing or pasting then clicking off the control.

I've noticed in the Auto Complete Box if you type a selection (or paste) and then left mouse click off the control the Selected Item will not be populated.

If I type (or paste) a selection and hit the "tab" key it will select the item.

How can I select the item when the user left mouse clicks off the control?

I can easily duplicate this with the "Auto Complete Box | First Look" from the WPF Controls Example.

See the attached pics.

The first example I typed "Respect" into the autocomplete box for Best Music Hit. I hit the Tab button and the data populated.

The second example I typed "Respect" into the autocomplete box for Best Music Hit. I then left mouse clicked outside of that control and the data does not populate.

Please advise.

AutoCompleteBox

answered on 18 Jan 2022

1 answer

108 views

I don't want the Frozen Columns Splitter to duplicate Column group header.

Hi,

on the Telerik website the following documentation can be found about Column Groups:

(figure 5 is not included here since it was not necessary)

I don't want the RadGridView to duplicate the column group once the FrozenColumnSplitter has been moved to the first column.
In my case I only have one column group, and I don't want it duplicated if the Frozen Column splitter is moved:

Do you know how I can change this?
Thanks!

GridView

answered on 18 Jan 2022

1 answer

199 views

QueryableEntityCoreCollectionView slow performance

Hi

I want to ask if there is any option to make QueryableEntityCoreCollectionView perform in backgroud with showing some loading icon on grid, cause it has slow performance for loading large DB table?

UI is not responding while loading. With pagging it is better, but we whould like to not use pagging. I was testing QueryableEntityCoreCollectionView on MVVM example: https://docs.telerik.com/devtools/wpf/controls/radentityframeworkcoredatasource/entityframeworkcore-mvvm-usage

Thanks

BR

Peter

EntityFrameworkCoreDataSource (.Net Core)

answered on 18 Jan 2022

1 answer

124 views

Link between Connection and Connection in Diagram

Can I link between Connection and Connection?

If it possible, tell me please,,,

Diagram

answered on 17 Jan 2022

1 answer

431 views

[Solved] How to find "PART_VerticalScrollBar" in scroll synchronization of two gridviews?

hello.

I used the scroll synchronization function in two gridviews through the linked example.
https://www.telerik.com/forums/scrolling-two-grids-f949e02b84ab

Since this is an old version, the ShowSearchPanel property does not exist.

If I put a SearchPanel in "PART_VerticalScrollBar", two objects appear.

When SearchPanel=true, the first is the VerticalScrollBar of SearchPanel, and the second is the VerticalScrollBar of the GridView.

When SearchPanel=false, only VerticalScrollBar of GridView is displayed.

How can I identify the "PART_VerticalScrollBar" of the GridView when the user uses the SearchPanel as a variable? I guess you shouldn't use "LastOrDefault".

Thanks.

GridView

answered on 14 Jan 2022

2 answers

239 views

RadPropertyGrid field width problem

Hello. How to make the field fill the width of the container and not stretch to fit the text. Two pictures in the attachment. In the second image, the PropertyGrid extends outside the container.

PropertyGrid

answered on 14 Jan 2022

2 answers

197 views

[Solved] Error (bug) in gridview row style visibility and AlternationCount

Hello.

This is similar to my most recent post.

Is the current example also not recommended? This is a row style using Visivility Hidden Converter.
I can see the opposite grid row when checked.

Here, I gave "AlternationCount" and the data is displayed with a gray background.

However, it is not visible when using the Search filter. (Visible when checked)

This seems like a bug.
Please confirm.

Thanks.

General Discussions

GridView

answered on 13 Jan 2022

1 answer

130 views

Exception when toggling columns visibility using search panel

Hi,

I'm trying to toggle the visibility of my columns based on the input of the search panel. My goal is to achieve something similar to this.

So I have created a very simple behavior like this:

internal class SearchColumnsByNameBehavior : Behavior<RadGridView>
{
    protected override void OnAttached()
    {
        base.OnAttached();

        AssociatedObject.ShowSearchPanel = true;
        AssociatedObject.Searching += OnSearching;
    }

    protected override void OnDetaching()
    {
        AssociatedObject.Searching -= OnSearching;

        base.OnDetaching();
    }

    private void OnSearching(object sender, GridViewSearchingEventArgs args)
    {
        foreach (GridViewColumn column in AssociatedObject.Columns)
        {
            string columnHeader = column.Header?.ToString();

            if (!string.IsNullOrEmpty(columnHeader))
            {
                column.IsVisible = columnHeader.Contains(args.SearchText);
            }
        }
    }
}

Unfortunately, when typing text in the textbox of the search panel, I get the following exception:

'No coercion operator is defined between types 'System.String' and 'MyProject.SomeClass+MyEnum'

Where 'MyEnum' is of type:

[Flags] enum MyEnum : ulong

Looks like there are things done under the hood of the search panel that I don't know about, or is it the '+' that is actually the real problem here?

What am I supposed to do? Thanks in advance!

Full stacktrace:

System.Linq.Expressions.Expression.GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType)
at Telerik.Windows.Data.Expressions.FilterDescriptorExpressionBuilder.CreateLeftOperandExpression()
at Telerik.Windows.Data.Expressions.OperatorValueFilterDescriptorExpressionBuilderBase.CreateBodyExpressionThreadSafe()
at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpressionThreadSafe()
at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpressionThreadSafe()
at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpressionThreadSafe()
at Telerik.Windows.Data.Expressions.FilterExpressionBuilder.CreateFilterExpression()
at Telerik.Windows.Data.QueryableExtensions.Where(IQueryable source, CompositeFilterDescriptorCollection filterDescriptors)
at Telerik.Windows.Data.QueryableCollectionView.CreateView()
at Telerik.Windows.Data.QueryableCollectionView.CreateInternalList()
at Telerik.Windows.Data.QueryableCollectionView.get_InternalList()
at Telerik.Windows.Data.QueryableCollectionView.get_InternalCount()
at Telerik.Windows.Data.QueryableCollectionView.get_IsEmpty()
at Telerik.Windows.Controls.GridView.BaseItemsControl.OnItemsCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Controls.GridView.GridViewDataControl.OnItemsCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.DataItemCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.DataItemCollection.OnCollectionViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at Telerik.Windows.Data.QueryableCollectionView.RefreshOverride()
at Telerik.Windows.Data.QueryableCollectionView.RefreshOrDefer()
at Telerik.Windows.Data.QueryableCollectionView.InvalidatePagingAndRefresh()
at Telerik.Windows.Data.QueryableCollectionView.OnFilterDescriptorsChanged()
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.ObservableItemCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.RadObservableCollection`1.ResumeNotifications()
at Telerik.Windows.Data.CollectionHelper.Reset(IEnumerable source, IList target, Func`2 itemConverter)
at Telerik.Windows.Data.ObservableCollectionManager.HandleCollectionChanged(IList sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.ObservableItemCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Telerik.Windows.Data.RadObservableCollection`1.ResumeNotifications()
at Telerik.Windows.Controls.GridView.SearchPanel.SearchViewModel.set_SearchText(String value)'

GridView

updated answer on 12 Jan 2022