Line Numbering
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Click Line Numbering Options… to invoke the Line Numbers Dialog.
To switch line numbering on, specify the SectionLineNumbering.CountBy property to any non-zero positive integer value. Other parameters can be set up as illustrated below.
Note
The RichEditView.AllowDisplayLineNumbers property enables you to show or hide line numbers in a view.
The following code snippet enables line numbering for the first section in the loaded document using the Section.LineNumbering property. Line numbering starts at number one and restarts at the new section. Numbers are displayed on each second line and are indented from the text at a distance equal to 75 documents (0.25 of an inch).
Line numberings are allowed to display in SimpleView and DraftView. To make line numbers visible, the left padding should be increased to 60 points.
Font face and color are specified using the Line Number document style.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/how-to-enable-line-numbering-and-count-the-document-rows-t531470
this.richEditControl1.Views.SimpleView.Padding = new System.Windows.Forms.Padding(60, 4, 4, 0);
this.richEditControl1.Views.DraftView.Padding = new System.Windows.Forms.Padding(60, 4, 4, 0);
richEditControl1.Views.SimpleView.AllowDisplayLineNumbers = true;
richEditControl1.Views.DraftView.AllowDisplayLineNumbers = true;
richEditControl1.Document.Sections[0].LineNumbering.Start = 1;
richEditControl1.Document.Sections[0].LineNumbering.CountBy = 2;
richEditControl1.Document.Sections[0].LineNumbering.Distance = 75f;
richEditControl1.Document.Sections[0].LineNumbering.RestartType = DevExpress.XtraRichEdit.API.Native.LineNumberingRestart.Continuous;
richEditControl1.Document.CharacterStyles["Line Number"].FontName = "Courier";
richEditControl1.Document.CharacterStyles["Line Number"].FontSize = 10;
richEditControl1.Document.CharacterStyles["Line Number"].ForeColor = Color.DarkGray;
richEditControl1.Document.CharacterStyles["Line Number"].Bold = true;