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
Form1.vb

csharp

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);
        }
    }));
}

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