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Request a Feature Report a Bug
Completed
Last Updated: 11 Nov 2025 08:11 by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
RichTextBox: Exceptions occur on loading documents with element tags that don't have direct content but are using opening and closing tags instead of self-closing tags
Created by: Martin Ivanov
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Exceptions occur on loading documents with element tags that don't have direct content but are using opening and closing tags instead of self-closing tags

The RichTextBox internal logic that imports .docx documents (DocxFormatProvider) doesn't support elements that don't need direct content, but have both start and end tags. Instead such elements should use self-closing tags. 

For example, instead of <w:vertAlign w:val="baseline"></w:vertAlign> it should be <w:vertAlign w:val="baseline"/>

When such element is read during import, issues may occur. Two main known issues here are with the w:vertAlign and Relationship tags.

Using

<w:vertAlign w:val="baseline"></w:vertAlign>

instead of

<w:vertAlign w:val="baseline"/>

throws NullReferenceException with the following stack trace:

System.NullReferenceException: 'Object reference not set to an instance of an object.'
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.OpenXmlHelper.ConvertStringToBaselineAlignment(string value) Line 168 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.SpanStyleImporter.ReadBaselineAlignment(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 243 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.SpanStyleImporter.ReadStyle(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 88 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.ReadSpanStyleProperties(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 278 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.ReadStyle() Line 188 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.Import() Line 67 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase importer) Line 430 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentAndRelationsFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase importer) Line 406 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.Import() Line 190 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider.Import(System.IO.Stream input) Line 147 C#
Telerik.Windows.Documents.dll!Telerik.Windows.Documents.FormatProviders.DocumentFormatProviderBase.Import(byte[] input) Line 90 C#

Using

<Relationship Id="rId00004" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"></Relationship>

instead of

<Relationship Id="rId00004" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"/>

throws KeyNotFoundException with the following stack trace:

KeyNotFoundException: The given key was not present in the dictionary.
    System.ThrowHelper.ThrowKeyNotFoundException() in ThrowHelper.cs
    System.Collections.Generic.Dictionary<TKey, TValue>.this[TKey].get(TKey) in Dictionary.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.PartRelationsImporter.GetRelationByID(string) in PartRelationsImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.GetRelationByID(string) in DocxImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildSection() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildBody() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildDocument() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.Import() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase) in DocxImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentAndRelationsFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase) in DocxImporter.cs

To work this around, import the document with the WordsProcessing library. If you need to display it in RadRichTextBox, you can export it again using the WordsProcessing library. This will normalize the tags. Then import it again using the RadDocument's DocxFormatProvider.

 var dplDocxFormatProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();
 RadFlowDocument flowDocument = dplDocxFormatProvider.Import(File.ReadAllBytes("../../../test.docx"), null);

 var docBytes = dplDocxFormatProvider.Export(flowDocument, null);
 File.WriteAllBytes("../../../modified-doc.docx", docBytes);

 var rtbDocxFormatProvider= new Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider();
 RadDocument document = rtbDocxFormatProvider.Import(File.ReadAllBytes("../../../modified-doc.docx"));

 

Completed
Last Updated: 11 Nov 2025 08:11 by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
RichTextBox: Importing an HTML that contains an image with align attribute does not apply the alignment
Created by: Stenly
Comments: 0
Category: RichTextBox
Type: Bug Report
1
RichTextBox: Importing an HTML that contains an image with align attribute does not apply the alignment
When importing an HTML string that contains an image, which has an align attribute, the image creation logic on import does not take this attribute's value and apply it.
Completed
Last Updated: 12 Aug 2025 10:30 by ADMIN
Release 2025.3.812 (2025 Q3)
RichTextBox: When selecting spans, some of which belong to a list, the numbering option does not allow for adding them in the existing list
Created by: Stenly
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: When selecting spans, some of which belong to a list, the numbering option does not allow for adding them in the existing list
Performing selection on spans, some of which are present in a list, does not allow for including all of them in the list. Instead, the current list will have to be removed and reapplied to all selected spans.
Completed
Last Updated: 11 Nov 2025 08:11 by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
RichTextBox: Exporting documents (RadDocument) to docx format produces an invalid file
Created by: Martin Ivanov
Comments: 2
Category: RichTextBox
Type: Bug Report
1
RichTextBox: Exporting documents (RadDocument) to docx format produces an invalid file
Exporting RadDocument to docx format (using the DocxFormatProvider) produces an invalid file. The file is read properly by document viewers like RadRichTextBox or MS Word, but if you open it with "Open XML SDK Productivity Tool for Microsoft Office" or another app that validates documents, the document is treated as invalid.

To work this around, you can import the invalid .docx document using the RadWordsProcessing library (and its RadFlowDocument) and then export it again with RadWordsProcessing.
Completed
Last Updated: 11 Nov 2025 08:11 by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
RichTextBox: Document exported to DOCX with 2025 Q2 cannot be opened by 2025 Q1
Created by: Daniel
Comments: 4
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Document exported to DOCX with 2025 Q2 cannot be opened by 2025 Q1

Document exported to DOCX with 2025 Q2 cannot be opened by 2025 Q1 or previous versions.

 

Workaround: Use document processing to fix the document.

var processing_provider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();

var document = processing_provider.Import(File.ReadAllBytes("C:\\Users\\test\\Downloads\\word1.docx"),null);
var bytes_ = processing_provider.Export(document, null);

var rtb_provider = new Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider();
var doc = rtb_provider.Import(bytes_);
radRichTextBox.Document = doc;

Completed
Last Updated: 21 May 2025 07:52 by ADMIN
Release 2025.2.521 (2025 Q2)
RichTextBox: Text locked or not visible after spacebar in Japanese
Created by: Adam
Comments: 1
Category: RichTextBox
Type: Bug Report
2
RichTextBox: Text locked or not visible after spacebar in Japanese

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.

Completed
Last Updated: 21 May 2025 07:52 by ADMIN
Release 2025.2.521 (2025 Q2)
RadRichTextBox: Exception when one parses styles that contain specific (German) characters
Created by: Daniel
Comments: 2
Category: RichTextBox
Type: Bug Report
1
RadRichTextBox: Exception when one parses styles that contain specific (German) characters
RadRichTextBox: Exception when one parses styles that contain specific (German) characters.
Completed
Last Updated: 21 May 2025 07:52 by ADMIN
Release 2025.2.521 (2025 Q2)
RichTextBox: If i select multiple Paragraphs and TabForward, all paragraphs will be indented by [indent value]*[selected paragraphs]
Created by: Simon
Comments: 0
Category: RichTextBox
Type: Bug Report
1
RichTextBox: If i select multiple Paragraphs and TabForward, all paragraphs will be indented by [indent value]*[selected paragraphs]
If I select multiple Paragraphs and TabForward, all paragraphs will be indented by [indent value]*[selected paragraphs]
Completed
Last Updated: 11 Feb 2025 07:40 by ADMIN
Release 2025.1.211 (2025 Q1)
RichTextBox: SocketException thrown when the UriSource of the ImageInline is assigned to image from the web and the server closes the connection
Created by: Martin Ivanov
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: SocketException thrown when the UriSource of the ImageInline is assigned to image from the web and the server closes the connection

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)

Completed
Last Updated: 21 May 2025 07:52 by ADMIN
Release 2025.2.521 (2025 Q2)
RichTextBox: Tab backwards command does not move the caret correctly in a table
Created by: Stenly
Comments: 0
Category: RichTextBox
Type: Feature Request
0
RichTextBox: Tab backwards command does not move the caret correctly in a table
Having a table, for example, with empty cells, executing the TabBackwardsCommand does not move the caret to the previous cell of the row.
Completed
Last Updated: 16 Jan 2025 11:41 by ADMIN
Release 2024.4.1219 (Preview)
RadDocument: IOException while exporting the document to byte array(PDF)
Created by: Ghiath
Comments: 4
Category: RichTextBox
Type: Bug Report
1
RadDocument: IOException while exporting the document to byte array(PDF)
IOException while exporting the document to byte array(PDF)
Completed
Last Updated: 11 Feb 2025 07:40 by ADMIN
Release 2025.1.211 (2025 Q1)
RichTextBox: ArgumentExeption when typing a specific combination with the new Japanese IME
Created by: Keisuke
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: ArgumentExeption when typing a specific combination with the new Japanese IME

ArgumentExeption when typing a specific combination with the new Japanese IME. 

Steps to reproduce:

  1. make sure new IME is used.
  2. Type "bcd" + space + "t -> argument exception occurs. 

Expected should work like in the standard text box.

Completed
Last Updated: 12 Nov 2024 08:17 by ADMIN
Release Telerik UI for WPF 2024.4.1111 (2024 Q4)
RichTextBox: LineNumberingDialog is not displayed in themes different than Windows11 and when NoXaml dlls are used
Created by: Martin Ivanov
Comments: 0
Category: RichTextBox
Type: Bug Report
1
RichTextBox: LineNumberingDialog is not displayed in themes different than Windows11 and when NoXaml dlls are used

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>

Completed
Last Updated: 12 Nov 2024 08:17 by ADMIN
Release Telerik UI for WPF 2024.4.1111 (2024 Q4)
RichTextBox: UnverifiedXamlException is thrown when importing a XAML document that contains a DocumentPartProperties instance
Created by: Stenly
Comments: 0
Category: RichTextBox
Type: Feature Request
1
RichTextBox: UnverifiedXamlException is thrown when importing a XAML document that contains a DocumentPartProperties instance
UnverifiedXamlException is thrown when importing an XAML document that contains a DocumentPartProperties instance.
Completed
Last Updated: 11 Nov 2025 08:11 by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
RichTextBox: Custom annotations are not rendered correctly when they have no content and are right aligned.
Created by: Mark
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Custom annotations are not rendered correctly when they have no content and are right aligned.
RichTextBox: Custom annotations are not rendered correctly when they have no content and are right-aligned (gif Attached).  
Completed
Last Updated: 20 Dec 2024 08:46 by ADMIN
Release 2024.4.1219 (Preview)
GridView: SpreadStreamExport exports DateTime objects as strings
Created by: Martin Ivanov
Comments: 0
Category: RichTextBox
Type: Bug Report
1
GridView: SpreadStreamExport exports DateTime objects as strings

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);

Completed
Last Updated: 12 Nov 2024 08:17 by ADMIN
Release Telerik UI for WPF 2024.4.1111 (2024 Q4)
RichTextBox: Exception when manipulating shapes in Flow layout mode
Created by: Keisuke
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Exception when manipulating shapes in Flow layout mode
Exception when manipulating shapes in Flow layout mode.
Completed
Last Updated: 18 Oct 2024 06:17 by ADMIN
Release 2024.3.924
RichTextBox: The annotations are not restored correctly when performing undo operations 3 times.
Created by: Swapnil
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: The annotations are not restored correctly when performing undo operations 3 times.
The annotations are not restored correctly when performing undo operations 3 times.
Completed
Last Updated: 22 Aug 2024 07:49 by ADMIN
Release 2024.3.821
RichTextBox: Performing an Undo operation on a span executes a delete which removes the annotations within the current selection
Created by: Swapnil
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Performing an Undo operation on a span executes a delete which removes the annotations within the current selection
Performing an Undo operation on a span executes a delete which removes the annotations within the current selection. This leads to invalid removed annotations and exception when executing the second undo.
Completed
Last Updated: 12 Nov 2024 08:17 by ADMIN
Release Telerik UI for WPF 2024.4.1111 (2024 Q4)
RichTextBox: One is unable to insert SDT (content controls) right before or right after another content control.
Created by: Dimitar
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: One is unable to insert SDT (content controls) right before or right after another content control.
One is unable to insert SDT (content controls) right before or right after another content control. 
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