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How do I perform VS.NET like underlining for offending code in the EditControl ?

Platform: WinForms |
Control: EditControl |
Published Date: April 30, 2011 |
Last Revised Date: July 10, 2014


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 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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