解決方案：
private double sum = 0;//取指定列的數據和，你要根據具體情況對待可能你要處理的是int
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowIndex >= 0)
{
sum += Convert.ToDouble(e.Row.Cells[6].Text);
}
else if (e.Row.RowType == DataControlRowType.Footer)
{
e.Row.Cells[5].Text = "總薪水爲：";
e.Row.Cells[6].Text = sum.ToString();
e.Row.Cells[3].Text = "平均薪水爲：";
e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
}
}
後臺全部代碼：
using System;using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Drawing; public partial class Default7 : System.Web.UI.Page { SqlConnection sqlcon; SqlCommand sqlcom; string strCon = "Data Source=(local);Database=北風貿易;Uid=sa;Pwd=sa"; protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { bind(); } } protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e) { GridView1.EditIndex = e.NewEditIndex; bind(); } protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e) { sqlcon = new SqlConnection(strCon); string sqlstr = "update 飛狐工作室 set 姓名='" + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "',家庭住址='" + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "' where 身份證號碼='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'"; sqlcom = new SqlCommand(sqlstr, sqlcon); sqlcon.Open(); sqlcom.ExecuteNonQuery(); sqlcon.Close(); GridView1.EditIndex = -1; bind(); } protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) { GridView1.EditIndex = -1; bind(); } public void bind() { string sqlstr = "select top 5 * from 飛狐工作室"; sqlcon = new SqlConnection(strCon); SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon); DataSet myds = new DataSet(); sqlcon.Open(); myda.Fill(myds, "飛狐工作室"); GridView1.DataSource = myds; GridView1.DataKeyNames = new string[] { "身份證號碼" }; GridView1.DataBind(); sqlcon.Close(); } private double sum = 0;//取指定列的數據和 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowIndex >= 0) { sum += Convert.ToDouble(e.Row.Cells[6].Text); } else if (e.Row.RowType == DataControlRowType.Footer) { e.Row.Cells[5].Text = "總薪水爲："; e.Row.Cells[6].Text = sum.ToString(); e.Row.Cells[3].Text = "平均薪水爲："; e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString(); } } } 前臺：唯一的花頭就是設置ShowFooter="True" ，否則默認表頭爲隱藏的！ <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="3" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px" OnRowDataBound="GridView1_RowDataBound" ShowFooter="True" > <FooterStyle BackColor="White" ForeColor="#000066" /> <Columns> <asp:CommandField HeaderText="編輯" ShowEditButton="True" /> <asp:BoundField DataField="身份證號碼" HeaderText="編號" ReadOnly="True" /> <asp:BoundField DataField="姓名" HeaderText="姓名" /> <asp:BoundField DataField="出生日期" HeaderText="郵政編碼" /> <asp:BoundField DataField="家庭住址" HeaderText="家庭住址" /> <asp:BoundField DataField="郵政編碼" HeaderText="郵政編碼" /> <asp:BoundField DataField="起薪" HeaderText="起薪" /> </Columns> <RowStyle ForeColor="#000066" /> <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" /> <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" CssClass="ms-formlabel DataGridFixedHeader"/> <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" /> </asp:GridView>