DataGrid 完全攻略之五（使用DropDownList）

前台代码：html

<% @ Page language="c#" Codebehind="UseDropDown.aspx.cs" AutoEventWireup="false" Inherits="MsDataGrid.UseDropDown"  %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > DataGrid使用举例 </ title >
         < meta  name ="GENERATOR"  Content ="Microsoft Visual Studio 7.0" >
         < meta  name ="CODE_LANGUAGE"  Content ="C#" >
         < meta  name ="vs_defaultClientScript"  content ="JavaScript" >
         < meta  name ="vs_targetSchema"  content ="http://schemas.microsoft.com/intellisense/ie5" >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < FONT  face ="宋体" >
                 < asp:DataGrid  id ="dgShow"  style ="Z-INDEX: 101; LEFT: 31px; POSITION: absolute; TOP: 93px"  runat ="server"  Width ="842px"  Height ="172px"  BorderColor ="Tan"  BorderWidth ="1px"  BackColor ="LightGoldenrodYellow"  CellPadding ="2"  GridLines ="None"  ForeColor ="Black"  PageSize ="1"  AutoGenerateColumns ="False" >
                     < SelectedItemStyle  ForeColor ="GhostWhite"  BackColor ="DarkSlateBlue" ></ SelectedItemStyle >
                     < AlternatingItemStyle  BackColor ="PaleGoldenrod" ></ AlternatingItemStyle >
                     < HeaderStyle  Font-Bold ="True"  BackColor ="Tan" ></ HeaderStyle >
                     < FooterStyle  BackColor ="Tan" ></ FooterStyle >
                     < Columns >
                         < asp:BoundColumn  DataField ="StudentID"  ReadOnly ="True"  HeaderText ="学生ID" ></ asp:BoundColumn >
                         < asp:BoundColumn  DataField ="StudentName"  HeaderText ="学生姓名" ></ asp:BoundColumn >
                         < asp:BoundColumn  DataField ="StudentPass"  HeaderText ="密码" ></ asp:BoundColumn >
                         < asp:BoundColumn  DataField ="Sex"  HeaderText ="性别" ></ asp:BoundColumn >
                         < asp:BoundColumn  DataField ="Birthday"  HeaderText ="生日"  DataFormatString ="{0:yyyy-M-d}" ></ asp:BoundColumn >
                         < asp:BoundColumn  DataField ="Email"  HeaderText ="邮件地址" ></ asp:BoundColumn >
                         < asp:TemplateColumn  HeaderText ="性别模板列" >
                             < ItemTemplate >
                                 < asp:DropDownList  id ="ddlSexI"  runat ="server"  Enabled ="False" >
                                     < asp:ListItem  Value ="1" > 男 </ asp:ListItem >
                                     < asp:ListItem  Value ="0" > 女 </ asp:ListItem >
                                 </ asp:DropDownList >
                             </ ItemTemplate >
                             < EditItemTemplate >
                                 < asp:DropDownList  id ="ddlSexE"  runat ="server" >
                                     < asp:ListItem  Value ="1" > 男 </ asp:ListItem >
                                     < asp:ListItem  Value ="0" > 女 </ asp:ListItem >
                                 </ asp:DropDownList >
                             </ EditItemTemplate >
                         </ asp:TemplateColumn >
                         < asp:ButtonColumn  Text ="选择"  HeaderText ="选择"  CommandName ="Select" ></ asp:ButtonColumn >
                         < asp:EditCommandColumn  ButtonType ="LinkButton"  UpdateText ="更新"  HeaderText ="操作"  CancelText ="取消"  EditText ="编辑" ></ asp:EditCommandColumn >
                         < asp:ButtonColumn  Text ="删除"  HeaderText ="删除"  CommandName ="Delete" ></ asp:ButtonColumn >
                     </ Columns >
                     < PagerStyle  HorizontalAlign ="Center"  ForeColor ="DarkSlateBlue"  BackColor ="PaleGoldenrod" ></ PagerStyle >
                 </ asp:DataGrid ></ FONT >
         </ form >
     </ body >
</ HTML >

后台代码：cs

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Web;
using  System.Web.SessionState;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.HtmlControls;
using  System.Data.SqlClient;
namespace  MsDataGrid
{
    /**//// <summary>
    /// WebForm1 的摘要说明。
    /// </summary>
    public class UseDropDown : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DataGrid dgShow;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            if(!IsPostBack)
                BindData();
            
        }
        private void BindData()
        {
            string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
            SqlConnection con = new SqlConnection(strCon);
            SqlDataAdapter da = new SqlDataAdapter("Select * from tbStudentinfo",con);
            DataSet ds = new DataSet();
            da.Fill(ds,"studentinfo");
            dgShow.DataSource = ds.Tables["studentinfo"].DefaultView;
            dgShow.DataBind();
            foreach(DataGridItem dgi in dgShow.Items)
            {
                //以下绑定非编辑状态下拉列表 
                DropDownList ddI = (DropDownList)dgi.FindControl("ddlSexI");
                if(ddI!=null)
                {
                    bool bSex = (bool)ds.Tables["studentinfo"].Rows[dgi.ItemIndex]["Sex"];
                    if(bSex)
                        ddI.SelectedIndex = 0;
                    else
                        ddI.SelectedIndex = 1;
                }
                //以下绑定编辑状态下拉列表 
                DropDownList ddE = (DropDownList)dgi.FindControl("ddlSexE");
                if(ddE!=null)
                {
                    bool bSex = (bool)ds.Tables["studentinfo"].Rows[dgi.ItemIndex]["Sex"];
                    if(bSex)
                        ddE.SelectedIndex = 0;
                    else
                        ddE.SelectedIndex = 1;
                }
                
            }
            
        }
        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.dgShow.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.dgShow_PageIndexChanged);
            this.dgShow.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgShow_CancelCommand);
            this.dgShow.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgShow_EditCommand);
            this.dgShow.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgShow_UpdateCommand);
            this.dgShow.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgShow_DeleteCommand);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void dgShow_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            dgShow.EditItemIndex = e.Item.ItemIndex;
            BindData();

        }
    
        private void dgShow_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            dgShow.EditItemIndex = -1;
            BindData();
        }
        private void dgShow_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
        {
            dgShow.CurrentPageIndex = e.NewPageIndex;
            BindData();
        }
        private void dgShow_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            if(dgShow.Items.Count==1)
            {
                if(dgShow.CurrentPageIndex!=0)
                    dgShow.CurrentPageIndex = dgShow.CurrentPageIndex-1;
            }
            string strSql = "delete from tbStudentinfo where studentid="+e.Item.Cells[0].Text+"";
            ExecuteSql(strSql);
            BindData();

        }
        /**/////////////////////////////////////////////////////////////
        //说明：执行制定SQL语句/////////////////////////////////////
        /**////////////////////////////////////////////////////////////
        private void ExecuteSql(string strSql)
        {
            try
            {
                string strconn = System.Configuration.ConfigurationSettings.AppSettings["DSN"];//从Web.config中读取
                SqlConnection conn =new SqlConnection(strconn);
                SqlCommand com = new SqlCommand(strSql,conn);
                conn.Open();
                com.ExecuteNonQuery();
                conn.Close();
            } 
            catch(Exception e)
            {
                Response.Write("<script language = 'javascript'>alert('"+e.Message+"');</script>") ;
                            
            }
        }
        
        private void dgShow_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            string strStudentID = e.Item.Cells[0].Text;//处于非编辑状态
            string strName = ((TextBox)(e.Item.Cells[1].Controls[0])).Text;//处于编辑状态
            string strPass =((TextBox)(e.Item.Cells[2].Controls[0])).Text;
            string strSex = ((DropDownList)(e.Item.FindControl("ddlSexE"))).SelectedItem.Value;
            string strBirthday =((TextBox)(e.Item.Cells[4].Controls[0])).Text;
            string strEmail =((TextBox)(e.Item.Cells[5].Controls[0])).Text;
            string strSql = "update tbStudentinfo set StudentName='"+strName+"',StudentPass='"+strPass+"'";
            strSql +=",Sex="+strSex+",Birthday='"+strBirthday+"',Email='"+strEmail+"' where studentid="+strStudentID+"";
            ExecuteSql(strSql);
            dgShow.EditItemIndex = -1;
            BindData();

        }

        
    }
}