Recently Updated
Unplanned
Last Updated:
10 Oct 2025 15:44
by Martin Ivanov
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
NullReferenceException thrown on opening the CompletionListWindow when RadSyntaxEditor is hosted in a non-WPF application (usually WinForms) and there are no WPF Application and MainWindow initialized.
This can happen if the RadSyntaxEditor for WPF is hosted in a WinForms application. In this scenario the System.Windows.Application.Current and its MainWindow are not initialized, which is what the IntelliPrompt positioning logic relies on.
Exception details:
System.NullReferenceException: 'Object reference not set to an instance of an object.'
> Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPosition(System.Windows.Point pointInScreen) Line 452 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPosition(System.Windows.Point pointInEditorPresenter, System.Windows.Point pointAboveTheCaret) Line 442 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPositionInView() Line 480 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.InitializeIntellisense() Line 401 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.Show(Telerik.Windows.Controls.SyntaxEditor.UI.CaretPosition caretStartPosition, Telerik.Windows.Controls.SyntaxEditor.UI.CaretPosition caretEndPositions) Line 211 C#
Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.Show() Line 182 C#To work this around, you can initialize a new WPF application and MainWindow and create a hidden HwndSource for the MainWindow. This should happen before showing the WPF content in the WinForms application's code.
public Form1()
{
InitializeComponent();
new System.Windows.Application();
System.Windows.Application.Current.MainWindow = new System.Windows.Window();
var parameters = new HwndSourceParameters("HiddenHost")
{
Width = 1, Height = 1,
WindowStyle = unchecked((int)0x80000000) // WS_POPUP | WS_EX_NOACTIVATE
};
var hwndSource = new HwndSource(parameters);
hwndSource.RootVisual = System.Windows.Application.Current.MainWindow;
// other code here
ElementHost host = new ElementHost { Dock = DockStyle.Fill };
host.Child = wpfControl
this.Controls.Add(host);
}
Unplanned
Last Updated:
09 Oct 2025 12:50
by Martin Ivanov
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
By default, when typing text in the RadSyntaxEditor and you reach the end of the viewport (horizontally or vertically), the control auto-scrolls so that the newly typed character is within the viewport. This behavior stops working after you zoom-in the editor.
Unplanned
Last Updated:
02 Oct 2025 12:01
by Systeem
Created by:
Troy
Comments:
2
Category:
SyntaxEditor
Type:
Feature Request
I do have some feedback on this component. I love it, but of course there are some areas where improvement can be made. For instance, in the screenshot below, I have highlighted some words where improvement can be made.
- ‘1,2,3,5’ – Literals in SSMS are Red
- ‘ER – 100% OF MEDICARE’ – OF is highlighted in Blue. It is contained in a literal and shouldn’t be highlighted
- ISNULL – Is a function and should be highlighted in Blue
Completed
Last Updated:
21 May 2025 07:52
by ADMIN
Release 2025.2.521 (2025 Q2)
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
The CSharpTagger matches the following character combination as a multiline comment start - / * (slash and a start with a whitespace between). This causes wrong tags creation in scenarios where the * character is a part of a single line comment. The correct comment start and end should be /* and */.
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.
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
{
}
Declined
Last Updated:
11 Apr 2025 09:26
by ADMIN
Created by:
조명희
Comments:
5
Category:
SyntaxEditor
Type:
Feature Request
Hi, I have a problem with using SyntaxEditor.
There are two errors when using Korean.
1. When I enter Korean, the caret is shown to the left of the position to be entered. (See line 19 in the Attached File 1)
To add a description of the attached file1, it was a situation in which "가나다라마바사아자차카타파하" was entered in the order, and "하" is the last letter entered, but it can be showed that "하" is located in the middle between "사" and "자". (See line 19 and I check this character with green border in the Attached File 2)
2. When Korean is present in the line, the length of the selection area represents shorter than the input width of the input characters when selected. (See line 3, 19, 20, 21, 27, 28 in the Attached File 3)
I found that the same defect occurred in Windows11 and Windows10.
I hope it will be resolved as soon as possible.
Unplanned
Last Updated:
13 Mar 2025 09:42
by Dariush
Created by:
Dariush
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Steps to Reproduce:
--Install Bopomofo or Quick input method (Traditional Chinese).
--Open the Telerik SyntaxEditor in a WPF application.
--In any text input field, enter an Alt code (e.g., Alt+0160 for a non-breaking space).
--Attempt to type any Chinese characters immediately after entering the Alt code.
Current Behavior:
-Bopomofo IME:
-- The user cannot type any Chinese characters after entering an Alt code.
-- Switching the language (e.g., pressing Shift) allows English input, but Chinese input remains blocked.
Quick IME:
-The input method automatically switches to English after entering an Alt code.
-The language indicator still shows Chinese, but characters typed are in English.
T-o resume Chinese input, the user must click another text field, alt-tab to another window, then return.
Expected Behavior:
-Users should be able to continue typing Chinese characters after entering Alt codes without needing to manually switch inputs.
-The IME state should remain consistent, allowing uninterrupted input.
--Install Bopomofo or Quick input method (Traditional Chinese).
--Open the Telerik SyntaxEditor in a WPF application.
--In any text input field, enter an Alt code (e.g., Alt+0160 for a non-breaking space).
--Attempt to type any Chinese characters immediately after entering the Alt code.
Current Behavior:
-Bopomofo IME:
-- The user cannot type any Chinese characters after entering an Alt code.
-- Switching the language (e.g., pressing Shift) allows English input, but Chinese input remains blocked.
Quick IME:
-The input method automatically switches to English after entering an Alt code.
-The language indicator still shows Chinese, but characters typed are in English.
T-o resume Chinese input, the user must click another text field, alt-tab to another window, then return.
Expected Behavior:
-Users should be able to continue typing Chinese characters after entering Alt codes without needing to manually switch inputs.
-The IME state should remain consistent, allowing uninterrupted input.
Unplanned
Last Updated:
23 Dec 2024 11:47
by Martin Ivanov
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Add option to enable indent guides (vertical lines) between the code lines in the SyntaxEditor.
Unplanned
Last Updated:
01 Nov 2024 09:13
by Dariush
Created by:
Dariush
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Add spellcheck as you type feature.
Unplanned
Last Updated:
28 Oct 2024 10:31
by Vladimir
Created by:
Vladimir
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
When the EditorFontFamily is set to SegoeUI the RadSyntaxEditor can be placed over letters when changing it position.
Completed
Last Updated:
13 Mar 2024 09:45
by ADMIN
Release 2024.1.130 (2024 Q1)
Created by:
Felix
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Currently the Caret of the SyntaxEditor does not behave like Caret in MS TextBox/ RichTextBox when IME is opened - IME opens on the bottom right part of the screen instead of below the caret. Also some input issues when selection is done in the IME should be addressed for a full support of this feature.
Unplanned
Last Updated:
22 Nov 2023 14:33
by Richard
Created by:
Petar
Comments:
4
Category:
SyntaxEditor
Type:
Feature Request
Add dependency property for showing/hiding the line numbers on the left of the source code.
Unplanned
Last Updated:
03 Nov 2023 09:23
by Stenly
Created by:
Stenly
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
We could introduce API for customizing the folding region lines and their respective regions. For example, a customization could be hover-coloring of line regions, like in the latest VS:
Duplicated
Last Updated:
25 Sep 2023 07:06
by ADMIN
Created by:
Petar
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Add support for successful typing text with IME - Chinese, Japanese, Korean etc.
Currently there are input issues, selection issues, caret issues when using IME input.
Currently there are input issues, selection issues, caret issues when using IME input.
Completed
Last Updated:
13 Jul 2023 08:43
by ADMIN
Release R2 2023 SP1
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Localize the tooltips for the match case button, the match word button and the use regular expression button.
Currently, the tooltips of the buttons are using hardcoded strings in English.
To translate the tooltips, you can get the corresponding buttons on load of the syntax editor control and replace their tooltips manually.
private void syntaxEditor_Loaded(object sender, RoutedEventArgs e)
{
var buttons = this.syntaxEditor.ChildrenOfType<RadToggleButton>();
var matchCaseButton = buttons.FirstOrDefault(x => x.Name == "PART_MatchCaseButton");
var matchWordButton = buttons.FirstOrDefault(x => x.Name == "PART_MatchWordButton");
var useRegularExpressionsButton = buttons.FirstOrDefault(x => x.Name == "PART_UseRegularExpressionsButton");
matchCaseButton.ToolTip = CreateToolTip("SyntaxEditor_MatchCase"); // these are custom localization resource keys that should be manually defined by the developer that uses this solution
matchWordButton.ToolTip = CreateToolTip("SyntaxEditor_MatchWord");
useRegularExpressionsButton.ToolTip = CreateToolTip("SyntaxEditor_UseRegularExpressions");
}
private static ToolTip CreateToolTip(string resourceKey)
{
var toolTip = new ToolTip();
toolTip.Content = LocalizationManager.Manager.GetStringOverride(resourceKey);
return toolTip;
}
Completed
Last Updated:
20 Jun 2023 06:04
by ADMIN
Release LIB 2023.2.619 (19 Jun 2023)
Created by:
BENN
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Searching "windows" in the text "Windows Windows Windows" with option MatchCase highlights all windows which is wrong - no highlight should be performed
Completed
Last Updated:
02 Jun 2023 08:39
by ADMIN
Release R2 2023
Created by:
Stenly
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
An exception is thrown when the RadSyntaxEditor is disabled with the Expression_Dark theme being applied with StyleManager.
Completed
Last Updated:
27 Apr 2023 07:51
by ADMIN
Release R2 2023
Created by:
Andrea.Gasparini
Comments:
7
Category:
SyntaxEditor
Type:
Feature Request
Good morning,
can You implement in one of the next releases the regex and case sensitive search? I provided you the Visual Studio 2019 search screenshot
Completed
Last Updated:
16 Mar 2023 05:55
by ADMIN
Release LIB 2023.1.320 (20 Mar 2023)
Created by:
Chris
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Single line folding regions is falsely recognized (by default it should be avoided) and messes up with outer regions.
For example
1 [
2 [ inner region]
3]
There should be no folding button on the inner line. Collapsing line 1 does not collapse 3 but only 1 and 2 which is wrong.
Completed
Last Updated:
06 Mar 2023 15:23
by ADMIN
Release R1 2023 SP1
Created by:
Petar
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Enter key is improperly handled internally and this results in inability to use the key in combination with other modifier keys for custom commands.
For example this custom code completion command does not fire when pressing Ctrl + Enter:
private void syntaxEditor_Loaded(object sender, RoutedEventArgs e)
{
var completionCommand = this.syntaxEditor.Commands.CodeCompletionCommand;
InputBinding keyBinding = null;
foreach (InputBinding item in this.syntaxEditor.EditorPresenter.Caret.InputBindings)
{
if (item.Command == completionCommand)
{
keyBinding = item;
break;
}
}
// unregister old key binding via Caret InputBindings
this.syntaxEditor.EditorPresenter.Caret.InputBindings.Remove(keyBinding);
// register new command in Syntaxeditor
this.syntaxEditor.KeyBindings.RegisterCommand(completionCommand, Key.Enter, ModifierKeys.Control);
}
For example this custom code completion command does not fire when pressing Ctrl + Enter:
private void syntaxEditor_Loaded(object sender, RoutedEventArgs e)
{
var completionCommand = this.syntaxEditor.Commands.CodeCompletionCommand;
InputBinding keyBinding = null;
foreach (InputBinding item in this.syntaxEditor.EditorPresenter.Caret.InputBindings)
{
if (item.Command == completionCommand)
{
keyBinding = item;
break;
}
}
// unregister old key binding via Caret InputBindings
this.syntaxEditor.EditorPresenter.Caret.InputBindings.Remove(keyBinding);
// register new command in Syntaxeditor
this.syntaxEditor.KeyBindings.RegisterCommand(completionCommand, Key.Enter, ModifierKeys.Control);
}
Completed
Last Updated:
06 Mar 2023 15:04
by ADMIN
Release R1 2023 SP1
Created by:
Luc
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
string link = "https:////_a_w_e_bsite.com" will falsely recognize a commented section and color it in CSharpTagger
Expected : no commented section and comment coloring in this code line
Expected : no commented section and comment coloring in this code line