However this leads to a memory leak since the dispatchers cant be GC'ed, see screenshot below.
The Screenshot is from the actual application we expirienced this issue with, the attached reproduction example is a boiled down version of what your code does.
If you wanna reproduce this on your own, create an application that uses PdfViewer that switches between many pdf files. The ammount of Dispatchers will grow steadily, probably to a total of the number of threads used by Task.Factory.
A memory leak in RadPdfViewer when the control gets removed from the visual tree.
To work this around, use the reflection API to access the leaking VisualTarget objects and call their Dispose method manually.
var pdfViewer = hostBorder.Child as RadPdfViewer;
if (pdfViewer != null)
{
var canvas = viewer.ChildrenOfType<Canvas>().FirstOrDefault(x => x.GetType().Name.Contains("ContentElementsCanvas"));
var visualTargetsDictionaryField = canvas.GetType().GetField("pageNumberToVisualTarget", BindingFlags.NonPublic | BindingFlags.Instance);
var visualTargetsDictionary = (Dictionary<int, List<VisualTarget>>)visualTargetsDictionaryField.GetValue(canvas);
foreach (KeyValuePair<int, List<VisualTarget>> target in visualTargetsDictionary)
{
for (int i = 0; i < target.Value.Count; i++)
{
VisualTarget item = target.Value[i];
item.RootVisual = null;
item.Dispose();
}
}
}
hostBorder.Child = null;
hostBorder.Child = new RadPdfViewer() { Document = newDocument };
The CustomFilterDialogContent element's OK and Cancel buttons are different in size for the Windows 11 theme.
To work this around, you can subscribe to the Loaded event of the CustomFilterDialogContent element and retrieve the RadButton with x:Name="PART_ButtonCancel" via the ChildrenOfType extension method. On the retrieved button, set the VerticalAlignment property to Center.
The following code snippet showcases this suggestion's implementation:
static MainWindow()
{
EventManager.RegisterClassHandler(typeof(CustomFilterDialogContent), LoadedEvent, new RoutedEventHandler(OnCustomFilterDialogContentLoaded));
}
private static void OnCustomFilterDialogContentLoaded(object sender, RoutedEventArgs e)
{
RadButton cancelButton = ((CustomFilterDialogContent)sender).ChildrenOfType<RadButton>().FirstOrDefault(x => x.Name == "PART_ButtonCancel");
if (cancelButton != null)
{
cancelButton.VerticalAlignment = VerticalAlignment.Center;
}
}
This is observed when using a different culture, for example, "ar-EG".
NullReferenceException occurs when the the automation peers creation for the rows goes over 10,000 peers (the MaxCachedPeersSize setting of the GridViewDataControlAutomationPeer). The exception occurs only when the 'record' modifier is used in the class definition. For example:
public record class MyClass(int Id)
{
}The exception stacktrace is:
System.NullReferenceException: 'Object reference not set to an instance of an object.'
peer was null.
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.ClearPeer(Telerik.Windows.Automation.Peers.DataItemAutomationPeer peer) Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.GetOrCreateItemPeer(object item, int index) Line 288 C# Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewRowAutomationPeer.FindDataItemAutomationPeer(System.Collections.Generic.List<System.Windows.Automation.Peers.AutomationPeer> childPeers) Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewRowAutomationPeer.GetChildrenCore() .
To work this around use the "class" modifier instead of "record". For example, instead of:
public record class MyClass(int Id)
{
}Use:
public class MyClass
{
public int Id { get; set; }
}Or alternatively, increase the MaxCachedPeersSize value.
In the following example, the beginning of the first single line comment is considered a multiline comment start, but since nothing closes it, the entire text is tagged and colored as a comment.
// ***********************************************************************
// some other content here
// some other content here
// ***********************************************************************
public class TestClass
{
}
Check how the performance can be improved in this scenario. The StyleGallery is taking much time to load, the GetUsedCellRange method is called multiple times.
Currently, the DataFormatString property of the columns is applied only to the top-level rows and not to the child ones.
To work this around, create a new DataTemplate for the CellTemplate property of the column and set the StringFormat property of the Binding instance for the element that will be used to display the cell's value in view mode.
<telerik:GridViewDataColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding MyPropertyValue, StringFormat=N2}"/>
</DataTemplate>
</telerik:GridViewDataColumn.CellTemplate>
Workaround:
Create a custom provider with a custom source, and on the GetTile method of the custom source, you can override the query to contain the language parameter.
Type in Japanese text in RichTextBox that word wraps beyond the first line and export it to PDF. The text should always be left aligned (as visually shown when typing) but has an "indent" when exported when the font is Segoe UI.
When adding a button cell as below, if the button cell is selected the button doesn't work when tapping it.
<telerik:GridViewDataColumn Header="Config"
DataMemberBinding="{Binding .}" IsReadOnly="True">
<telerik:GridViewDataColumn.CellTemplate>
<DataTemplate>
<!-- Adding telerik:TouchManager.TouchMode="None" solves the issue -->
<telerik:RadButton HorizontalAlignment="Center" Style="{StaticResource MyButtonStyle}"
Margin="2" Padding="1" Width="Auto" Height="Auto"
Command="{Binding DataContext.ShowExtraConfigurationCommand, RelativeSource={RelativeSource AncestorType=Window}}"
CommandParameter="{Binding .}" ToolTip="Config">
<telerik:RadGlyph Glyph="{StaticResource GlyphGear}"/>
</telerik:RadButton>
</DataTemplate>
</telerik:GridViewDataColumn.CellTemplate>
</telerik:GridViewDataColumn>As stated in the comment, adding the property below to the RadButton solves the issue.
telerik:TouchManager.TouchMode="None"I have attached a sample project in which the error occurs, simply tap a button, close the MessageBox and tap the same button again. Thank you for your time!
The current implementation of the Code128 symbology class used with RadBarcode throws an InvalidSymbolException for characters with codes greater than 127.
As you can see from this table, there are many special characters in Code128 that have larger codes:
https://en.wikipedia.org/wiki/Code_128#Bar_code_widths
It would be useful to have these in applications which need to modify a reader device's behavior with barcode control characters in order to communicate properly.
** Fixed with Telerik.Licensing 1.4.16 **
The build performance with new license validation (2025) is very poor. 2025 version takes about 5 sec. extra time to build. For small projects it takes 10x longer.
Test environment:
- Default WPF project created from template.
- Only one change: Nuget Reference in .csproj
- .NET 8
- Visual Studio 17.13.
Build times depending on the Version of Telerik Nuget:
<PackageReference Include="Telerik.Windows.Controls.Navigation.for.Wpf" Version="2025.1.211" />
11:25:47:071 Build started at 11:25...
11:25:47:189 1>------ Build started: Project: TelerikBuildTest, Configuration: Debug Any CPU ------
11:25:51:748 1>[Telerik and Kendo UI Licensing]
11:25:51:748 1> Telerik and Kendo UI License Key found at: C:\Users\...\AppData\Roaming\Telerik\telerik-license.txt (UserDirectory)
11:25:51:748 1> License issued at 2025-03-16 to e**********@....
11:25:51:748 1>[Telerik and Kendo UI Licensing]
11:25:51:748 1> Valid Telerik UI for WPF license found.
11:25:52:743 1>[Telerik and Kendo UI Licensing]
11:25:52:743 1> Telerik and Kendo UI License Key found at: C:\Users\...\AppData\Roaming\Telerik\telerik-license.txt (UserDirectory)
11:25:52:743 1> License issued at 2025-03-16 to e**********@...
11:25:52:743 1>[Telerik and Kendo UI Licensing]
11:25:52:743 1> Valid Telerik UI for WPF license found.
11:25:52:815 1>TelerikBuildTest -> C:\Users\....\source\repos\TelerikBuildTest\TelerikBuildTest\bin\Debug\net8.0-windows\TelerikBuildTest.dll
11:25:52:828 ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
11:25:52:828 ========== Build completed at 11:25 and took 05,892 seconds ==========
<PackageReference Include="Telerik.Windows.Controls.Navigation.for.Wpf" Version="2024.4.1213" />
11:26:33:405 Build started at 11:26...
11:26:33:581 1>------ Build started: Project: TelerikBuildTest, Configuration: Debug Any CPU ------
11:26:33:953 1>TelerikBuildTest -> C:\Users\...\source\repos\TelerikBuildTest\TelerikBuildTest\bin\Debug\net8.0-windows\TelerikBuildTest.dll
11:26:33:960 ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
11:26:33:960 ========== Build completed at 11:26 and took 00,633 seconds ==========
Are there any plans to release a Visual Studio 2022 theme for WPF? The Winforms UI has this theme, and I would like to have it for WPF as well.
Are there other themes on the roadmap that you could share?
Thanks!
--Darren
Currently SvgImage does not support the following inner animation:
<svg xmlns="http://www.w3.org/2000/svg"
className="linesBox"
viewBox="0 0 4325 2626"
width="1200"
height="800"
>
<path
d="m 2806,792.50001 -13.5,16.5 -33,10 -19.5,6.5 -17,15.5 -19,1 -9,16 -29.5,-4.70812 -34,18.70812 -37.5,16 -1.5,18 -20.5,8"
id="path60"
fill="none"
stroke="blue"
stroke-dasharray="20 10"
stroke-dashoffset="0"
stroke-width="4">
<animate attributeName="stroke-dashoffset"
from="0" to="30"
dur="3s"
repeatCount="indefinite"/>
</path>
</svg>
Add support for the rest : 'translate', 'scale', 'skewx', 'skewy'