GridView加入自动求和求平均值小计 

GridView加入自动求和求平均值小计

效果图：

解决方案：    

private 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

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 = "总薪水为：";

            e.Row.Cells[6].Text = sum.ToString();

            e.Row.Cells[3].Text = "平均薪水为：";

            e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();

        }

    }

后台全部代码：

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=北风贸易;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 飞狐工作室 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 身份证号码='"

            + 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 飞狐工作室";

        sqlcon = new SqlConnection(strCon);

        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);

        DataSet myds = new DataSet();

        sqlcon.Open();

        myda.Fill(myds, "飞狐工作室");

        GridView1.DataSource = myds;

        GridView1.DataKeyNames = new string[] { "身份证号码" };

        GridView1.DataBind();

        sqlcon.Close();

    }

    private double sum = 0;//取指定列的数据和

    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 = "总薪水为：";

            e.Row.Cells[6].Text = sum.ToString();

            e.Row.Cells[3].Text = "平均薪水为：";

            e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();

        }

    }

}

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

<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="编辑" ShowEditButton="True" />

                            <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />

                            <asp:BoundField DataField="姓名" HeaderText="姓名"  />

                            <asp:BoundField DataField="出生日期" HeaderText="邮政编码"  />

                            <asp:BoundField DataField="家庭住址" HeaderText="家庭住址"  />

                            <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" />

                            <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>