Good day. I have functionality in my WPF application that allows the user to change the font size, font style, and theme variations at runtime, see code below. This functions perfectly when it works. 

The issue I am having is that when making changes to these values at runtime, the changes intermittently stop being applied. The way I understand theming is that I should be able to make these changes at runtime and they are automatically applied. Something is getting borked up causing the changes to stop being applied during runtime.

C#, WPF .NET 6

Theme: Office 2019

Telerik Version: 2023.1.117

I'm using the package Telerik.UI.Wpf.NetCore.Xaml for all controls. Theme packages come from No XAML.

// Theme Color Variation// High Contrast
Office2019Palette.LoadPreset(Office2019Palette.ColorVariation.HighContrast);

// Dark/Light Mode
if (RegistryHelper.IsWindowsDarkMode())
    Office2019Palette.LoadPreset(Office2019Palette.ColorVariation.Dark);
else
    Office2019Palette.LoadPreset(Office2019Palette.ColorVariation.Light);


// Change Font Family
Office2019Palette.Palette.FontFamily = new FontFamily(Settings.Default.FontFamily);


// Font Size
Telerik.Windows.Controls.Office2019Palette.Palette.FontSizeS = 10;
Telerik.Windows.Controls.Office2019Palette.Palette.FontSize = 12;
Telerik.Windows.Controls.Office2019Palette.Palette.FontSizeL = 14;

App.xaml for Telerik:

<prism:PrismApplication x:Class="Wpf.App"
                        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
                        xmlns:prism="http://prismlibrary.com/">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>

                <!-- Telerik -->
                <ResourceDictionary Source="/Telerik.Windows.Themes.Office2019;component/Themes/System.Windows.xaml" />
                <ResourceDictionary Source="/Telerik.Windows.Themes.Office2019;component/Themes/Telerik.Windows.Controls.xaml" />
                <ResourceDictionary Source="/Telerik.Windows.Themes.Office2019;component/Themes/Telerik.Windows.Controls.Input.xaml" />
                <ResourceDictionary Source="/Telerik.Windows.Themes.Office2019;component/Themes/Telerik.Windows.Controls.Navigation.xaml" />

            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</prism:PrismApplication>

Hello,

I'm using several RadNumericUpDown controls and when the language/region is set to English, as expected they show numbers with dots as decimal separators, which is fine. But when I set any European language/region they still show dots rather than commas. How can I fix this issue?

My code is like the snippet below:

                                       <telerik:RadNumericUpDown Value="{Binding ScaleMin}" HorizontalAlignment="Stretch" Width="120" Margin="5"
                                                              VerticalAlignment="Center" SmallChange="0.1" ValueFormat="Numeric" IsEnabled="{Binding IsAvailable}">
                                        <telerik:RadNumericUpDown.NumberFormatInfo>
                                            <global:NumberFormatInfo NumberGroupSeparator="" NumberDecimalDigits="1"/>
                                        </telerik:RadNumericUpDown.NumberFormatInfo>
                                        <telerik:RadNumericUpDown.Resources>
                                            <Style TargetType="{x:Type TextBox}">
                                                <Setter Property="MaxLength" Value="8"/>
                                            </Style>
                                        </telerik:RadNumericUpDown.Resources>
                                    </telerik:RadNumericUpDown>

Thanks,

G.

how to change the background color of a color picker control when expanded (black theme) to a customized color ? 

Hi,

I have many RadGridView columns with binding to a Double number with StringFormat: 0:N3.

I configured the grouping header text to show the value and the number of elements (Aggregate Function).

For example:

Frequency Column with the following rows:

123.123

123.123

The group header will be:

Frequency: 123.123 (2)

The problem is with larger numbers  For example:

123.1234

123.1235

On the cell, the user will see:

123.123

123.123

On the grouping headers, the user will see two groups:

Frequency: 123.123 (1)

Frequency: 123.123 (1)

On filtering, if the user selects equal to 123.123, the grid will display 0 rows.

Even if I update the Header Text to show N4 only when having 4 no zero decimals (using a converter), the filtering will not work as the user expects

I think that the easiest solution is to configure the grouping and filtering to apply the logic on the displayed value, how can I do that? (the display value is a string but the filtering operators shall be for number, it is an issue?)

Maybe another option is to write a custom filter/grouping where I can implement the operator logic on Math.Round 3 and then use it on the xaml?

I can't imagine any other simple solution but I am sure that you can :)

Please, I need a simpme solution that I can apply on the xaml styles to the whole application. I am not working with code behind at all to avoid copiying logic everywhere.

Hello,

I have a NumericUpDown with the following configuration:

1. NumberDecimalDigits=3

2. Binding to Double property in ViewModel

3. Validation (IDataErrorInfo) between 20-3000.

4. Small change 0.001

5. Big change 0.1

When I write 123.1234, I can see 123.123 in the UI but in the view model, you don't remove the additional digits.

I have the following problems:

1. Sometimes when using arrows up/down or page up/down, the 4 digit is removed. I expected that the snall/large change takes effect without removing any digits because the NumberDecimalDigits shall affect the UI.

2. On grouping/filtering, I want to apply the logic on the UI value instead of the binding value.

For 1234.1234 and 1234.1235 will be created two different groups.

In case that I have a double with 4 digits, but in the UI is configured to N3, I don't want to see two groups with same value in the Header Text. The user will not understand why there are two groups.

How can I configure the RadNumericUpDown to show 3 digits but if there is an error and the number has 4 digits to show 4 digits? (with this solution the user will understand why there is an error if he types 19.9996.

For this value, it will be round 20.000 and mark as error when minimim value 20 is allowed. Showing 4 digits will solve it.

How can I configure the Grouping and Filtering of the RadGridView to consider some double value as N3?

Our organization has an app that we're porting from .NET/WPF to React. We have several grids, that utilize this:

```

using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using Telerik.WinControls;
using System.Configuration;
using System.Data.SqlClient;
using Telerik.WinControls.UI;
using Telerik.WinControls.Data;
using System.Data.OleDb;
using System.Linq;
using System.Threading.Tasks;
using System.Web.UI.WebControls;

using System.ComponentModel;

```

Instead, I'd like to use KendoReact.

Before I rewrite the entire thing in NextJS/KendoReact, are there some tools and techniques that I could use to save time?

Hi Telerik support,

I have two questions about the gridview checkbox column for WPF, see the sample application.

Just like in WinForms Telerik gridview with .EndEdit,  I want to end the edit and push the value to the viewmodel and have no more edit mode or editor active in the UI. Is there a way to achieve this behaviour?

The other question, when trying to set the EditTriggers in a style (with the intent to implicitly target every GridViewCheckBoxColumn) it straight up ignores it but it works when setting the EditTriggers in the column (see sample). Is this intended?

Kind regards,

Querijn

I have downloaded the Telerik provided example Telerik xaml-sdk\DataServiceDataSource to investigate using the Telerik RadGridView and its pagination behaviors against an OData webservice. For the most part this is working as I expected however I have one other requirement.

I have provided a screenshot of some functionality that allows a user to build their own custom subset of the information displayed by moving rows from the original source to another separate list however when a record is removed from the DataServiceSource the pagination is disabled as it detects that a change is present.

I need the DataServiceSource to be bound to the grid so that the filtering and paging works against the OData API as intended but this precludes me from getting the list building to work.

Is there a way we can disable this internal change tracking or is there some other components we could use?

Hello. 

I am using custom field extends on CodeBasedField. This field fetch some data form database or prompt window on request. Sometimes its simple string, some time its rft string. I face with problem on handling rft strings. Here is how its looks like in "Code" mode:

Here is how I handle result value of field:

protected override DocumentFragment GetResultFragment()
    {
        var text = "";
        /* 
        text = fetch string handle here
        */
        if (!text.StartsWith(@"{\rtf"))
        {
            var document = new RtfFormatProvider().Import(text);
            return new DocumentFragment(document);
        }
        return CreateFragmentFromText(text);
    }

And if 'text' is rtf the "Result" mode is this:

You can see that extra line breaking there.

I am sure that my rtf have no extra line breaking or paragraphs. As well as "SpacingAfter" parameter for paragraph is 0.

The reason of it is how code handle Paragraphs.

Here is some code from Telerik lib:

How fragment created from document:

How Fragment inserted in RadDocument:

The code inserts "line break" after Paragraph if its single in fragment and if "IsLastParagraphClosed" is true. I cant change value of "IsLastParagraphClosed" because its setter is internal. 

Same problem if my rtf has more then one Paragraph. In that case it use another flow in InsertFragmentInternal method but the result is same - extra line breaking after Field.

I found workaround to skip this line breaking, create fragment not from RadDocument but from Selection:

protected override DocumentFragment GetResultFragment()
    {
        var text = "";
        /* 
        text = fetch string handle here
        */
        if (!text.StartsWith(@"{\rtf"))
        {
            var document = new RtfFormatProvider().Import(text);
            document.Selection.SelectAll();
            return new DocumentFragment(document.Selection);
        }
        return CreateFragmentFromText(text);
    }

But in this case its not reproduce full text formatting (e.g. TextAlingment) for my rtf.

Please help me to find proper workaround or fix this issue.