The operating system region and language needs to be set to Japanese.
RichTextBox seems to have several issues with Japanese, but being locked from visibility or edit is the biggest one.
To recreate, start typing in Japanese, push the "right" arrow after selecting the IME option desired, then hit "spacebar." This seems to duplicate the text, then when trying to continue to type into the text field the text is no longer visible (yet the IME does display).
The native WPF RichTextBox has no issues (and also supports partial selection, etc.).
I've attached a video to show the behavior with 2025 Q1 telerik.
*note:* This is on a machine with NVIDIA graphics. I mention this as there may be some issues with RichTextBox and the hardware... When I'm in a virtual machine with a completely Japanese environment and virtual graphics driver, there is NO text visible at all when trying to type into the RichTextBox. Works fine with other controls and wpf RichTextBox.
This causes some problems if the hyperlink is edited and the document is exported and imported again.
Workaround:
private void RadRichTextBox1_DocumentChanged(object sender, EventArgs e)
{
var document = radRichTextEditor1.Document;
var fields = document.EnumerateChildrenOfType<FieldRangeStart>();
foreach (FieldRangeStart item in fields)
{
radRichTextEditor1.DeleteAnnotationRange(item);
}
}
When a new line is placed right after a nbsp, the new line is ignored in the layout. This can be reproduced by importing the following HTML:
First <br/>Second
A SocketException can occur when the ImageInline source is assigned to a link pointing to a picture on a remote server (a website). For example: UriSource ="https://docs.telerik.com/devtools/wpf/knowledge-base/images/kb-chartview-categorical-and-datetime-axis-0.png"
This could happen during the fetching of the image stream. In some cases, the server may give a NetworkStream or ConnectionStream, or similar Stream implementation, which keeps an open connection between the application and the server. If the connection get severed during the stream reading, an exception is thrown.
The exception message is: "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host."
The stacktrace is:
Exception Info: System.Net.Sockets.SocketException
at System.Net.Sockets.NetworkStream.Read(Byte[], Int32, Int32)
Inner Exception:
Exception Info: System.IO.IOException
at System.Net.ConnectStream.Read(Byte[], Int32, Int32)
at System.IO.Stream.InternalCopyTo(System.IO.Stream, Int32)
at Telerik.Windows.Documents.Layout.ExtensionMethods.ToMemoryStream(System.IO.Stream)
at Telerik.Windows.Documents.Model.ImageInline.<SetStreamFromUriSource>b__0(System.Object, StreamReadyEventArgs)
at Telerik.Windows.Documents.Utils.ResourceStreamLocator.OnStreamReady()
at System.Net.WebClient.OnOpenReadCompleted(System.Net.OpenReadCompletedEventArgs)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(System.Object)
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
at System.Windows.Application.RunDispatcher(System.Object)
at System.Windows.Application.RunInternal(System.Windows.Window)
ArgumentExeption when typing a specific combination with the new Japanese IME.
Steps to reproduce:
- make sure new IME is used.
- Type "bcd" + space + "t -> argument exception occurs.
Expected should work like in the standard text box.
Using the SpreadStreamExport feature of RadGridView doesn't work as expected when exporting DateTime objects. It exports the dates as String values which prevents the date-related features (like formatting) to work in Excel.
To work this around, you can create a custom SpreadStreamExportRenderer and override its SetCellValue method. This will allow you to manually provide the DateTime object instead of the string.
public class MyRenderer : SpreadStreamExportRenderer
{
public override void SetCellValue(DataType dataType, object value)
{
DateTime date;
if (value != null && DateTime.TryParse(value.ToString(), out date))
{
base.SetCellValue(DataType.DateTime, date);
var cell = this.GetCell() as ICellExporter;
cell.SetFormat(new SpreadCellFormat() { NumberFormat = "yyyy-MM-dd HH:mm:ss" });
return;
}
base.SetCellValue(dataType, value);
}
} spreadStreamExport.RunExportAsync(FILENAME, new MyRenderer(), options);
The custom list styles from a document exported by RadRichTextBox's HtmlFormatProvider are not imported.
When trying to show the RadRichTextBox' LineNumberingDialog, nothing is displayed. This happens when using the NoXaml Telerik dlls and themes other than Windows11. The dialog is shown only in the Windows11 theme.
To work this around, add the following two lines in the App.xaml resources.
<Application x:Class="WpfApp1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApp1"
xmlns:telerikDialogs="clr-namespace:Telerik.Windows.Controls.RichTextBoxUI.Dialogs;assembly=Telerik.Windows.Controls.RichTextBox"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/System.Windows.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/Telerik.Windows.Controls.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/Telerik.Windows.Controls.ImageEditor.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/Telerik.Windows.Controls.Navigation.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/Telerik.Windows.Controls.Input.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/Telerik.Windows.Controls.RibbonView.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Fluent;component/Themes/Telerik.Windows.Controls.RichTextBox.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Style TargetType="telerikDialogs:LineNumberingDialog" BasedOn="{StaticResource RadWindowStyle}"/>
<Style TargetType="telerikDialogs:LineNumberingDistanceNumericUpDown" BasedOn="{StaticResource RadNumericUpDownStyle}"/>
</ResourceDictionary>
</Application.Resources>
</Application>