• 业务逻辑>表现层>列表控件 数据选择>手动绑定到数据源


    首先是前台页面:

      1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="CH9_DemoForm003.aspx.cs" Inherits="CH9_DemoForm003" %>
      2 
      3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
      4 
      5 <html xmlns="http://www.w3.org/1999/xhtml">
      6 <head id="Head1" runat="server">
      7     <title>示范以程序控制方式绑定列表类型控件</title>
      8     <style type="text/css">
      9         #form1
     10         {
     11             text-align: center;
     12         }
     13         body
     14         {
     15             font-family: Lucida Sans Unicode;
     16             font-size: 10pt;
     17         }
     18         button
     19         {
     20             font-family: tahoma;
     21             font-size: 8pt;
     22         }
     23         .highlight
     24         {
     25             display: block;
     26             color: red;
     27             font: bold 24px Arial;
     28             margin: 10px;
     29         }
     30         .style1
     31         {
     32             width: 312px;
     33             text-align: left;
     34         }
     35     </style>
     36 </head>
     37 <body>
     38     <form id="form1" runat="server">
     39     <div>
     40       <table border="1">
     41             <tr>
     42                 <td colspan="2">
     43                     Hi
     44                     <b><%=Request.LogonUserIdentity.Name%></b>
     45                     您好,您的 IP 地址是
     46                     <b><%=Request.UserHostAddress%></b>
     47                     <br />欢迎光临并请选择下列选项:
     48                 </td>
     49             </tr>
     50             <tr>
     51                 <td style="text-align: right">
     52                     请选择您的性别:
     53                 </td>
     54                 <td class="style1">
     55                     <asp:RadioButtonList ID="Gender_RadioButtonList" runat="server">
     56                         <asp:ListItem Selected="True" Value="0"></asp:ListItem>
     57                         <asp:ListItem Value="1"></asp:ListItem>
     58                     </asp:RadioButtonList>
     59                 </td>
     60             </tr>
     61             <tr>
     62                 <td style="text-align: right">
     63                     请问您已婚或未婚:
     64                 </td>
     65                 <td class="style1">
     66                     <asp:ListBox ID="Marital_ListBox" runat="server" Height="45px">
     67                         <asp:ListItem Selected="True" Value="0">未婚</asp:ListItem>
     68                         <asp:ListItem Value="1">已婚</asp:ListItem>
     69                     </asp:ListBox>
     70                 </td>
     71             </tr>
     72             <tr>
     73                 <td style="text-align: right">
     74                     请选择居住地:
     75                 </td>
     76                 <td class="style1">
     77                     <asp:DropDownList ID="Resident_DropDownList" runat="server" Height="22px" 
     78                         Width="123px">
     79                     </asp:DropDownList>
     80                 </td>
     81             </tr>
     82             <tr>
     83                 <td style="text-align: right">
     84                     请选择您的职业:
     85                 </td>
     86                 <td class="style1">
     87                     <asp:DropDownList ID="Job_DropDownList" runat="server" 
     88                         Height="22px" Width="278px">
     89                     </asp:DropDownList>
     90                 </td>
     91             </tr>            
     92             <tr>
     93                 <td style="text-align: right">
     94                     请选择您的专长:
     95                 </td>
     96                 <td class="style1">
     97                     <asp:DropDownList ID="Speciality_DropDownList" runat="server" 
     98                         Height="22px" Width="278px">
     99                     </asp:DropDownList>
    100                 </td>
    101             </tr>                        
    102         </table>       
    103     </div>
    104     </form>
    105 </body>
    106 </html>
    107 
    108 

    Job_DropDownListSpeciality_DropDownList是没有用数据源控件绑定,而是后台代码手动绑定到数据源。

    后台代码:

     1 using System;
     2 using System.Collections;
     3 using System.Configuration;
     4 using System.Data;
     5 using System.Linq;
     6 using System.Web;
     7 using System.Web.Security;
     8 using System.Web.UI;
     9 using System.Web.UI.HtmlControls;
    10 using System.Web.UI.WebControls;
    11 using System.Web.UI.WebControls.WebParts;
    12 using System.Xml.Linq;
    13 using System.Data.SqlClient;
    14 using System.Collections.Generic;
    15 
    16 public partial class CH9_DemoForm003 : System.Web.UI.Page
    17 {
    18     protected void Page_Load(object sender, EventArgs e)
    19     {
    20         if (!IsPostBack)
    21         {
    22             // 创建一个连接对象。
    23             using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["chtNorthwind"].ConnectionString))
    24             {
    25 
    26                 // 创建一个命令对象。
    27                 SqlCommand cmd = new SqlCommand();
    28                 cmd.Connection = con;
    29                 cmd.CommandText = "SELECT 县市代号, 县市名称 FROM 县市";
    30 
    31                 // 开启连接。
    32                 con.Open();
    33 
    34                 // 创建一个 SqlDataReader 对象。
    35                 using (SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.SingleResult))
    36                 {
    37                     // 将 DropDownList 控件绑定至 SqlDataReader 对象。                    
    38                     this.Resident_DropDownList.DataSource = dr;
    39                     this.Resident_DropDownList.DataTextField = "县市名称";
    40                     this.Resident_DropDownList.DataValueField = "县市代号";
    41                     this.Resident_DropDownList.DataBind();
    42                 }
    43 
    44                 cmd.CommandText = "SELECT 职业类别名称, 职业类别编号 FROM 职业类别";
    45                 using (SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.SingleResult))
    46                 {
    47                     // 将 DropDownList 控件绑定至 SqlDataReader 对象。
    48                     this.Job_DropDownList.DataSource = dr;
    49                     this.Job_DropDownList.DataTextField = "职业类别名称";
    50                     this.Job_DropDownList.DataValueField = "职业类别编号";
    51                     this.Job_DropDownList.DataBind();
    52                 }
    53             }
    54 
    55             // 创建一个泛型集合来内含 Speciality 对象。
    56             List<Speciality> shoppingCart = new List<Speciality>();
    57             shoppingCart.Add(new Speciality(1"数据库设计"));
    58             shoppingCart.Add(new Speciality(2"市场分析"));
    59             shoppingCart.Add(new Speciality(3"交际"));
    60             shoppingCart.Add(new Speciality(4"决策分析"));
    61 
    62             // 将 DropDownList 控件绑定至泛型集合。
    63             Speciality_DropDownList.DataSource = shoppingCart;
    64             Speciality_DropDownList.DataTextField = "Name";
    65             Speciality_DropDownList.DataValueField = "Id";
    66             Speciality_DropDownList.DataBind();
    67 
    68         }
    69 
    70     }
    71 }
    72 
    73 public class Speciality
    74 {
    75     private int _id;
    76     public string _name;
    77     public int Id
    78     {
    79         get { return _id; }
    80     }
    81 
    82     public string Name
    83     {
    84         get { return _name; }
    85     }
    86 
    87     public Speciality(int id, string name)
    88     {
    89         _id = id;
    90         _name = name;
    91     }
    92 }
    93 
    94 
    95 

    对于DropDownList 有两种后台绑定方式,一种数据库,另一种泛型集合。


    合乎自然而生生不息。。。
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  • 原文地址:https://www.cnblogs.com/samwu/p/1790778.html
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