Spread for ASP.NET 使用拼接方法设置公式

protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack)
            {
                return;
            }
            FpSpread1.Sheets[0].ReferenceStyle = FarPoint.Web.Spread.Model.ReferenceStyle.R1C1;
            this.FpSpread1.ClientAutoCalculation = true;

            this.FpSpread1.Sheets[0].Cells[0, 2].Tag = "单价";
            this.FpSpread1.Sheets[0].Cells[1, 3].Tag = "数量";
            this.FpSpread1.Sheets[0].Cells[2, 3].Tag = "总金额";

            FarPoint.Web.Spread.Cell _unitPrice = this.FpSpread1.Sheets[0].GetCellFromTag(this.FpSpread1.Sheets[0].Cells[0, 0], "单价");
            FarPoint.Web.Spread.Cell _quantity = this.FpSpread1.Sheets[0].GetCellFromTag(this.FpSpread1.Sheets[0].Cells[0, 0], "数量");
            FarPoint.Web.Spread.Cell _toalPrice = this.FpSpread1.Sheets[0].GetCellFromTag(this.FpSpread1.Sheets[0].Cells[0, 0], "总金额");
            this.FpSpread1.Sheets[0].AllowUserFormulas = true;
            string formula = "PRODUCT(" + "R" + (_unitPrice.Row.Index + 1).ToString() + "C" + (_unitPrice.Column.Index + 1).ToString() + "," + "R" + (_quantity.Row.Index + 1).ToString() + "C" + (_quantity.Column.Index + 1).ToString() + ")";

            _toalPrice.Formula = formula;
        }
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