ASP.Net 之Datalist删除功能详解附代码

 
    
    
 
 
    
    

public partial class _Default : System.Web.UI.Page
{

    ////得到Web.config 中的连接放在变量中
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings[“connStr”].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
           //调用自定义方法绑定数据到控件（为以后做MVC打下基础）
            BindDataList();
        }
    }
    //对datelist进行数据绑定
    private void BindDataList()
    {

       
        //定义查询语句,这里最好将SQL语句在SQL中写好并验证正确确在复制粘贴过来（在对数据查询时最好只查所需的一些不需要的数据就不要取出，这样可以提高运行的效率）
        string strSql = “SELECT * FROM bg_spatial”;//定义一条SQL语句
        SqlDataAdapter sda = new SqlDataAdapter(strSql, con);
        DataSet ds = new DataSet();
        sda.Fill(ds);//把执行得到的数据放在数据集中
        DataList1.DataSource = ds;
        DataList1.DataBind();

    }

    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        switch (e.CommandName)
        {
            //单条数据删除操作
            case “delete”:
                //取得当前Datalist控件列
                int id = int.Parse(DataList1.DataKeys[e.Item.ItemIndex].ToString());
                string strSQL = “delete from bg_spatial where id='” + id + “‘”;
                if (con.State.Equals(ConnectionState.Closed))
                {
                    con.Open();//打开数据库
                }
                SqlCommand cmd = new SqlCommand(strSQL, con);
                if (Convert.ToInt32(cmd.ExecuteNonQuery())>0)
                {
                    Response.Write(“”);
                    BindDataList();
                }
                else
                {
                    Response.Write(“”);
                }
                con.Close();//关闭连接
                break;
            //批量数据删除操作
            case “pldelete”:
                if (con.State.Equals(ConnectionState.Closed))
                {
                    con.Open();//打开数据库
                }
                DataListItemCollection dlic = DataList1.Items;//创建一个DataList列表项集合对象
                //执行一个循环删除所选中的信息
                for (int i = 0; i <dlic.Count; i++)
                {
                    if (dlic[i].ItemType == ListItemType.Alt来源[email protected]搞@^&代*@码网ernatingItem||dlic[i].ItemType == ListItemType.Item)
                    {
                         CheckBox cbox = (CheckBox)dlic[i].FindControl(“CheckBox2”);
                         if (cbox.Checked)
                        {
                            int p_id = int.Parse(DataList1.DataKeys[dlic[i].ItemIndex].ToString());
                            SqlCommand p_cmd = new SqlCommand(“delete from bg_spatial where id=” + p_id , con);
                            p_cmd.ExecuteNonQuery();
                        }
                    }

                }
                con.Close();
                BindDataList();
                break;
        }
    }
}