主题：求助：报表增加合计一行统计不了请老师指导

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我在做合计时出现错误，请老师再帮忙指点下，

        Dim nr As Row = MainTable.AddNew
        nr("单位") = "合计"
        For i As Integer = 2 To MainTable.Cols.Count - 1
        nr(MainTable.Cols(i).Name) = MainTable.Compute("Sum(" & MainTable.Cols(i).Name & ")")
        Next