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How to perform VS.NET like underlining for offending code in the WinForms SyntaxEditor (EditControl)?

Platform: WinForms |
Control: EditControl

Underlying text

The SyntaxEditor (EditControl) supports VS.NET like wavy underlining of text. The wavy underlines can also have custom color and double lines. Please refer to the code snippets and sample application attached below that illustrates how you could implement the offending code underlining feature of VS.NET in SyntaxEditor (EditControl).


// Starting offset converted to virtual point
Point startVirtualPoint = this.editControl1.ConvertOffsetToVirtualPosition(startOffsetValue);
// Ending offset converted to virtual point
Point endVirtualPoint = this.editControl1.ConvertOffsetToVirtualPosition(endOffsetValue);
// Converting the VirtualPoints to ParsePoints
ParsePoint startParsePoint = new ParsePoint(startVirtualPoint.Y, startVirtualPoint.X, 0);
ParsePoint endParsePoint = new ParsePoint(endVirtualPoint.Y, endVirtualPoint.X, 0);
// Creating the associated CoordinatePoints that indicate the text range
CoordinatePoint startCoordinatePoint = new CoordinatePoint((ILexemParser)this.editControl1.Parser, startParsePoint, startVirtualPoint.Y, startVirtualPoint.X, true);
CoordinatePoint endCoordinatePoint = new CoordinatePoint((ILexemParser)this.editControl1.Parser, endParsePoint, endVirtualPoint.Y, endVirtualPoint.X, true);
ISnippetFormat format = editControl1.RegisterUnderlineFormat(Color.Red, UnderlineStyle.Wave, UnderlineWeight.Thick);
this.editControl1.SetUnderline (startCoordinatePoint, endCoordinatePoint, format);



' Starting offset converted to virtual point
Dim startVirtualPoint As Point = Me.editControl1.ConvertOffsetToVirtualPosition(startOffsetValue)
' Ending offset converted to virtual point
Dim endVirtualPoint As Point = Me.editControl1.ConvertOffsetToVirtualPosition(endOffsetValue)
' Converting the VirtualPoints to ParsePoints
Dim startParsePoint As New ParsePoint(startVirtualPoint.Y, startVirtualPoint.X, 0)
Dim endParsePoint As New ParsePoint(endVirtualPoint.Y, endVirtualPoint.X, 0)
' Creating the associated CoordinatePoints that indicate the text range
Dim startCoordinatePoint As New CoordinatePoint(CType(Me.editControl1.Parser, ILexemParser), startParsePoint, startVirtualPoint.Y, startVirtualPoint.X, True)
Dim endCoordinatePoint As New CoordinatePoint(CType(Me.editControl1.Parser, ILexemParser), endParsePoint, endVirtualPoint.Y, endVirtualPoint.X, True)
Dim format As ISnippetFormat = editControl1.RegisterUnderlineFormat(Color.Red, UnderlineStyle.Wave, UnderlineWeight.Thick)
Me.editControl1.SetUnderline(startCoordinatePoint, endCoordinatePoint, format)


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