C# NET Gridview控件如何显示查询数据？

我对Gridview控件显示值有问题；我想对一个表中三列的重复值求和，然后将最终结果放入Fridview单元格。但是数据不能显示在Gridview上，但是我在我的sql management studio中测试了sql命令。它工作得很好，有人能帮我解决吗？谢谢

我的表名是[评估]； 所有列都是：[评估ID]、[工作站]、[日期]……[数字高]、[数字高]、[数字高]、[数字高]、[数字低]。 现在，我使用计数大于1的工作站从评估组中选择SUMnumberOfhigh、SUMnumberOffurther、SUMnumberOflow，以获得重复的工作站总风险

前端代码：

<asp:GridView ID="GridView1" runat="server" style="margin-left: 318px" AutoGenerateColumns="False" Height="269px" Width="440px" >
        <Columns>

           <asp:BoundField HeaderText="High Risk"  DataField="high">           
            <ItemStyle BackColor="Red" />             
            </asp:BoundField>

             <asp:BoundField HeaderText="Further Risk" DataField="further">             
            <ItemStyle BackColor="#CCCCCC" />            
            </asp:BoundField>

              <asp:BoundField HeaderText="Low Risk" DataField="low">              
            <ItemStyle BackColor="#33CC33" />            
            </asp:BoundField>

        </Columns>
    </asp:GridView>

  if (DropDownList2.SelectedIndex == 2 && DropDownList1.SelectedIndex == 1)
            {

                sqlConn.Open();

                string cmdText = "SELECT SUM(numberOfhigh),SUM(numberOffurther),SUM(numberOflow) FROM Assessment GROUP BY workstation HAVING COUNT(*) > 1";
                SqlDataAdapter sda = new SqlDataAdapter(cmdText, sqlConn);
                DataSet ds = new DataSet();
                sda.Fill(ds);
                GridView1.DataSource = ds.Tables[0];
                GridView1.DataBind();


                sqlConn.Close();
            }

您需要在SELECT中使用别名，否则GridView将不知道绑定到什么

SELECT SUM(numberOfhigh) AS high, SUM(numberOffurther) AS further, SUM(numberOflow) AS low
FROM Assessment
GROUP BY workstation HAVING COUNT(*) > 1

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例如，在数据库中使用列名作为字段名

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将上述代码用于前端

我猜您的查询中缺少列别名。如何编写它，您可以编写一个示例吗？

       <asp:BoundField HeaderText="High Risk"  DataField="numberOfhigh">           
        <ItemStyle BackColor="Red" />             
        </asp:BoundField>

         <asp:BoundField HeaderText="Further Risk" DataField="numberOffurther">             
        <ItemStyle BackColor="#CCCCCC" />            
        </asp:BoundField>

          <asp:BoundField HeaderText="Low Risk" DataField="numberOflow">              
        <ItemStyle BackColor="#33CC33" />            
        </asp:BoundField>

    </Columns>
</asp:GridView>