C# ASP.NET GridView-无法获取前一行中单元格的值

我正在尝试设置GridView的格式，以便当列中的值与前一个值相比发生变化时，字体颜色也会发生变化。我已经找到了很多这样做的例子，看起来很简单，但我无法让它工作。我使用下面的例子是基于我发现的另一个改变背景颜色的例子

protected void gvEscalationLinks_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Debug.WriteLine("e.Row.DataItemIndex: " + e.Row.DataItemIndex);

        if (e.Row.DataItemIndex == 0)
        {
            e.Row.Cells[1].BackColor = Color.AliceBlue;
            return;
        }

        GridViewRow prevRow = gvEscalationLinks.Rows[e.Row.RowIndex - 1];

        GridViewRow thisRow = e.Row;
        e.Row.Cells[1].BackColor = (thisRow.Cells[1].Text == prevRow.Cells[1].Text) ? Color.AliceBlue : Color.White;

        // no values are ever produced:
        Debug.WriteLine("prevRow.Cells[1].Text: " + prevRow.Cells[1].Text);
        Debug.WriteLine("thisRow.Cells[1].Text: " + thisRow.Cells[1].Text);
    }
}

问题是当前或上一行/单元格未返回任何值，因此此值始终为true：

(thisRow.Cells[1].Text == prevRow.Cells[1].Text) ? Color.AliceBlue : Color.White;

以下是我的GridView：

<asp:GridView ID="gvEscalationLinks" runat="server" OnRowDataBound="gvEscalationLinks_RowDataBound" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField HeaderText="Category">
            <ItemTemplate> 
                <asp:Label ID="lblCategory" runat="server" Text='<%# Eval("escCategory") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="SubCategory">
            <ItemTemplate> 
                <asp:Label ID="lblSubCategory" runat="server" Text='<%# Eval("escSubCategory") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Link">
            <ItemTemplate>
                <asp:HyperLink ID="lnkURL" NavigateUrl='<%# Eval("docurl") %>' runat="server"><%# Eval("linkname") %></asp:HyperLink>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Supporting Manager">    
            <ItemTemplate>
                <asp:Label ID="lblManager" runat="server" Text='<%# Eval("supportMgr") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

---

我做错了什么？

我的工作原理如下所示。从当前行和上一行获取值，如下所示：

GridViewRow thisRow = e.Row;
Label currentValue = thisRow.Cells[2].FindControl("lblSubCategory") as Label;

GridViewRow prevRow = gvEscalationLinks.Rows[e.Row.RowIndex - 1];
Label previousValue = prevRow.Cells[2].FindControl("lblSubCategory") as Label;

if (previousValue.Text != currentValue.Text)...

然而，实际上，我在让颜色正确交替方面遇到了很多麻烦，结果是我觉得有些困惑：

protected void gvEscalationLinks_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        GridViewRow thisRow = e.Row;
        Label currentValue = thisRow.Cells[2].FindControl("lblSubCategory") as Label;

        if (e.Row.DataItemIndex == 0)
        {
            e.Row.Cells[1].BackColor = Color.AliceBlue;
            Session["color"] = "AliceBlue";
            return;
        }

        GridViewRow prevRow = gvEscalationLinks.Rows[e.Row.RowIndex - 1];
        Label previousValue = prevRow.Cells[2].FindControl("lblSubCategory") as Label;

        if (previousValue.Text != currentValue.Text)
        {
            if ( Session["color"].ToString() == "AliceBlue" )
            {
                e.Row.Cells[1].BackColor = Color.White;
                Session["color"] = "White";
            }
            else
            {
                e.Row.Cells[1].BackColor = Color.AliceBlue;
                Session["color"] = "AliceBlue";
            }
        }
        else
        {
            if (Session["color"].ToString() == "AliceBlue")
            {
                e.Row.Cells[1].BackColor = Color.AliceBlue;
            }
            else
            {
                e.Row.Cells[1].BackColor = Color.White;
            }
        }
    }
}

---

使用调试器，在相关行设置断点，并检查prevRow.Cells[1]中的值。Text@nicomp-不确定你的建议是什么；我已经在用Debug.WriteLine为每一行吐出prevRow.Cells[1]文本。断点有什么不同的功能？