修改固定行与列的加粗边框显示样式

Spreadfor ASP.NET 6.0产品中提供了固定行与固定列的功能，用户只需设置以下两行代码就可以实现：

this.FpSpread1.Sheets[0].FrozenRowCount = 2;
this.FpSpread1.Sheets[0].FrozenColumnCount = 2;

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在Spread中实现固定行与固定列的基本思想是，将SheetView拆分为多个<Table>进行显示，并将交界的边线进行加粗显示，比如下面的效果：

在某些情况下，我们可能不需要交界处的边线加粗显示，而是与其它表格线显示一样的粗细，此时我们就的对SheetView拆分之后的<Table>进行一些特殊的样式设置，将viewport和viewport1的左边框隐藏，viewport和viewport2的上边框隐藏，而这一过程我们都放到Render中来实现，代码如下：

protected override void Render(HtmlTextWriter writer)
    {
        Table frozenTable1 = this.FpSpread1.FindControl("viewport1") as Table;

        if (frozenTable1 != null)
        {
            frozenTable1.Style.Value = "border-bottom: Black  1px solid; position: " +

                "relative; border-left: Black  0px solid; width: 1px; border-collapse:" +

                " collapse; table-layout: fixed; border-top: Black  1px solid; top: 0px;" +

                " cursor: default; border-right: Black  1px solid;";
        }

        Table frozenTable2 = this.FpSpread1.FindControl("viewport2") as Table;

        if (frozenTable2 != null)
        {
            frozenTable2.Style.Value = "border-bottom: Black  1px solid; position: " +

                "relative; border-left: Black  1px solid; width: 1px; border-collapse:" +

                " collapse; table-layout: fixed; border-top: Black  0px solid; top: 0px;" +

                " cursor: default; border-right: Black  1px solid;";
        }

        Table frozenTable = this.FpSpread1.FindControl("viewport") as Table;

        if (frozenTable != null)
        {
            frozenTable.Style.Value = "border-bottom: Black  1px solid; position: " +

                "relative; border-left: Black  0px solid; width: 1px; border-collapse:" +

                " collapse; table-layout: fixed; border-top: Black  0px solid; top: 0px;" +

                " cursor: default; border-right: Black  1px solid;";
        }

        base.Render(writer);

    }
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