主题：导出数据中，如何理解如下代码？

Dim dt As Table = Tables("订单")
Dim Book As New XLS.Book '定义一个Excel工作簿
Dim Sheet As XLS.Sheet = Book.Sheets(0) '引用工作簿的第一个工作表
Dim Style As Xls.Style = Book.NewStyle '新建一个样式
Style.BackColor = Color.Red '样式的背景颜色设为红色
For c As Integer = 0 To dt.Cols.Count -1 '添加列标题
    Sheet(0, c).Value = dt.Cols(c).Name
Next
For r As Integer = 0 To dt.Rows.Count - 1 '填入数据
    For c As Integer = 0 To dt.Cols.Count -1
        Sheet(r +1, c).Value = dt.rows(r)(c)
    Next
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《指南》中有关于dt.rows(r)(c)的用法吗？