How to: Count the Lines in the Document

• Oct 24, 2023

To count the lines in the document (document rows), create an instance of the LayoutVisitor descendant and let it traverse the page layout. When it encounters a new row, it calls the VisitRow method. This method increments the row counter to count the lines on a page.

To run the visitor each time after building the document layout, handle the DocumentLayout.DocumentFormatted event.

View Example

Form1.cs

private void DocumentLayout_DocumentFormatted(object sender, EventArgs e) {
    this.BeginInvoke((MethodInvoker)(() =>
    {
        if (this.Visible) {
            MyLayoutVisitor visitor = new MyLayoutVisitor(richEditControl1.Document);
            int pageCount = richEditControl1.DocumentLayout.GetFormattedPageCount();

            for (int i = 0; i < pageCount; i++) {
                visitor.Visit(richEditControl1.DocumentLayout.GetPage(i));
            }
            resultBarStaticItem.Caption = String.Format("Document has {0} lines", visitor.RowIndex);
        }
    }));
}

Form1.vb

Private Sub DocumentLayout_DocumentFormatted(ByVal sender As Object, ByVal e As EventArgs)
    Me.BeginInvoke(CType(Sub()
        If Me.Visible Then
            Dim visitor As New MyLayoutVisitor(richEditControl1.Document)
            Dim pageCount As Integer = richEditControl1.DocumentLayout.GetFormattedPageCount()

            For i As Integer = 0 To pageCount - 1
                visitor.Visit(richEditControl1.DocumentLayout.GetPage(i))
            Next i
            resultBarStaticItem.Caption = String.Format("Document has {0} lines", visitor.RowIndex)
        End If
    End Sub, MethodInvoker))
End Sub