GridView加入自动求和求平均值小计

解决方案：   

 1private double sum = 0;//取指定列的数据和，你要根据具体情况对待可能你要处理的是int
 2protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
 3{
 4    if (e.Row.RowIndex >= 0)
 5    {
 6        sum += Convert.ToDouble(e.Row.Cells[6].Text);
 7    }
 8    else if (e.Row.RowType == DataControlRowType.Footer)
 9    {
10        e.Row.Cells[5].Text = "总薪水为：";
11        e.Row.Cells[6].Text = sum.ToString();
12        e.Row.Cells[3].Text = "平均薪水为：";
13        e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
14    }
15}

后台全部代码：

 1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Web;
 5using System.Web.Security;
 6using System.Web.UI;
 7using System.Web.UI.WebControls;
 8using System.Web.UI.WebControls.WebParts;
 9using System.Web.UI.HtmlControls;
10using System.Data.SqlClient;
11using System.Drawing;
12public partial class Default7 : System.Web.UI.Page
13{
14    SqlConnection sqlcon;
15    SqlCommand sqlcom;
16    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
17    protected void Page_Load(object sender, EventArgs e)
18    {
19        if (!IsPostBack)
20        {
21            bind();
22        }
23    }
24    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
25    {
26        GridView1.EditIndex = e.NewEditIndex;
27        bind();
28    }
29    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
30    {
31        sqlcon = new SqlConnection(strCon);
32        string sqlstr = "update 飞狐工作室 set 姓名='"
33            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "',家庭住址='"
34            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "' where 身份证号码='"
35            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
36        sqlcom = new SqlCommand(sqlstr, sqlcon);
37        sqlcon.Open();
38        sqlcom.ExecuteNonQuery();
39        sqlcon.Close();
40        GridView1.EditIndex = -1;
41        bind();
42    }
43    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
44    {
45        GridView1.EditIndex = -1;
46        bind();
47    }
48    public void bind()
49    {
50        string sqlstr = "select top 5 * from 飞狐工作室";
51        sqlcon = new SqlConnection(strCon);
52        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
53        DataSet myds = new DataSet();
54        sqlcon.Open();
55        myda.Fill(myds, "飞狐工作室");
56        GridView1.DataSource = myds;
57        GridView1.DataKeyNames = new string[] { "身份证号码" };
58        GridView1.DataBind();
59        sqlcon.Close();
60    }
61    private double sum = 0;//取指定列的数据和
62    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
63    {
64        if (e.Row.RowIndex >= 0)
65        {
66            sum += Convert.ToDouble(e.Row.Cells[6].Text);
67        }
68        else if (e.Row.RowType == DataControlRowType.Footer)
69        {
70            e.Row.Cells[5].Text = "总薪水为：";
71            e.Row.Cells[6].Text = sum.ToString();
72            e.Row.Cells[3].Text = "平均薪水为：";
73            e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
74        }
75    }
76}

前台：唯一的花头就是设置ShowFooter="True" ，否则默认表头为隐藏的！

 1<asp:GridView ID="GridView1" runat="server"    AutoGenerateColumns="False" CellPadding="3"  OnRowEditing="GridView1_RowEditing"
 2    OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px" OnRowDataBound="GridView1_RowDataBound" ShowFooter="True"  >
 3    <FooterStyle BackColor="White" ForeColor="#000066" />
 4    <Columns>
 5        <asp:CommandField HeaderText="编辑" ShowEditButton="True" />
 6        <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />
 7        <asp:BoundField DataField="姓名" HeaderText="姓名"  />
 8        <asp:BoundField DataField="出生日期" HeaderText="邮政编码"  />
 9        <asp:BoundField DataField="家庭住址" HeaderText="家庭住址"  />
10        <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" />
11        <asp:BoundField DataField="起薪" HeaderText="起薪"  />
12       
13    </Columns>
14    <RowStyle ForeColor="#000066" />
15    <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
16    <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left"  CssClass="ms-formlabel DataGridFixedHeader"/>
17    <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
18</asp:GridView>