首页 > 代码库 > 在下拉列表中显示多个字段的两种方法
在下拉列表中显示多个字段的两种方法
首先，我们需要从数据库中取到我们的数据
Class1：
1 string sqlcon = "Data Source=.;Initial Catalog=Test;User ID=sa;Password=******"; 2 3 public List<ModelClass> FindAll() 4 { 5 try 6 { 7 List<ModelClass> modList = new List<ModelClass>(); 8 using (SqlConnection con = new SqlConnection(sqlcon)) 9 {10 con.Open();11 string sql = "select ID,Name,Address from TEST1";12 SqlCommand com = new SqlCommand();13 com.CommandText = sql;14 com.CommandType = CommandType.Text;15 com.Connection = con;16 using (SqlDataReader read = com.ExecuteReader())17 {18 while (read.Read())19 {20 modList.Add(new ModelClass() { ID = Convert.ToInt32(read["ID"].ToString()), Name = read["Name"].ToString(), Address = read["Address"].ToString() });21 }22 }23 return modList;24 }25 }26 catch (Exception)27 {28 throw;29 }30 }31 32 public System.Data.DataSet FindAllToDS()33 {34 try35 {36 using (SqlConnection con = new SqlConnection(sqlcon))37 {38 con.Open();39 System.Data.DataSet ds = new DataSet();40 string sql = "select ID,Name,Address from TEST1";41 SqlDataAdapter sda = new SqlDataAdapter();42 sda.SelectCommand = new SqlCommand(sql,con);43 sda.Fill(ds);44 return ds;45 }46 }47 catch (Exception)48 {49 50 throw;51 }52 }
我分别用list和DataSet两种方式取得了数据，首先我们需要构造一个实现这样方法的类
gzClass:
1 public class gzClass2 {3 public int ID { get; set; }4 public string NameAndAddress { get; set; }5 }
第一种实现方法：在后台试用构造类去绑定数据
1 protected void Page_Load(object sender, EventArgs e) 2 { 3 if (!IsPostBack) 4 { 5 //元数据 6 List<ModelClass> modelList = new List<ModelClass>(); 7 System.Data.DataTable dt = new System.Data.DataTable(); 8 //赋值护具 9 List<gzClass> strListToList = new List<gzClass>();10 List<gzClass> dtList = new List<gzClass>();11 //测试连接数据库类12 Class1 c1 = new Class1();13 //赋值14 modelList = c1.FindAll();15 dt = c1.FindAllToDS().Tables[0];16 //遍历取值并给与另一个构造类17 foreach (ModelClass item in modelList)18 {19 strListToList.Add(new gzClass() { ID = item.ID, NameAndAddress = item.Name + "(" + item.Address + ")" });20 }21 22 23 if (dt != null && dt.Rows.Count > 0)24 {25 foreach (System.Data.DataRow dsItem in dt.Rows)26 {27 dtList.Add(new gzClass() { ID = Convert.ToInt32(dsItem["ID"]), NameAndAddress = dsItem["Name"] + "(" + dsItem["Address"] + ")" });28 }29 }30 31 32 33 this.ddl_list.DataSource = strListToList;34 this.ddl_list.DataTextField = "NameAndAddress";35 this.ddl_list.DataValueField = "ID";36 this.ddl_list.DataBind();37 38 this.ddl_ds.DataSource = dtList;39 this.ddl_ds.DataTextField = "NameAndAddress";40 this.ddl_ds.DataValueField = "ID";41 this.ddl_ds.DataBind();42 43 }44 }
第二种方法：使用ajax异步加载，进行拼接，这时就要借助我们的一般处理程序了
1 public void ProcessRequest(HttpContext context) 2 { 3 context.Response.ContentType = "text/plain"; 4 5 //元数据 6 List<ModelClass> modelList = new List<ModelClass>(); 7 System.Data.DataTable dt = new System.Data.DataTable(); 8 StringBuilder sbu1 = new StringBuilder(); 9 //测试连接数据库类10 Class1 c1 = new Class1();11 //赋值12 modelList = c1.FindAll();13 dt = c1.FindAllToDS().Tables[0];14 15 //拼接数据16 sbu1.AppendLine("<select name=\"ddl_list\" id=\"ddl_list\">");17 foreach (ModelClass modelItem in modelList)18 {19 sbu1.AppendLine("<option value=http://www.mamicode.com/""+modelItem.ID+"\">"+modelItem.Name+"("+modelItem.Address+")</option>");20 }21 sbu1.AppendLine("</select>");22 23 24 sbu1.AppendLine(" <select name=\"ddl_datarow\" id=\"ddl_datarow\">");25 foreach (System.Data.DataRow drItem in dt.Rows)26 {27 sbu1.AppendLine("<option value=http://www.mamicode.com/""+drItem["ID"].ToString()+"\">"+drItem["Name"]+"("+drItem["Address"]+")</option>");28 }29 sbu1.AppendLine("</select>");30 context.Response.Write(sbu1.ToString());31 context.Response.End();32 }
把数据返回并在页面中给值，下面是我的aspx页面
1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebTest1.WebForm1" %> 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 runat="server"> 7 <title></title> 8 <script src="jquery-2.1.1.min.js" type="text/javascript"></script> 9 </head>10 <body>11 <form id="form1" runat="server">12 <div>13 <asp:DropDownList ID="ddl_list" runat="server">14 </asp:DropDownList>15 <asp:DropDownList ID="ddl_ds" runat="server">16 </asp:DropDownList>17 <div id="ddlDisplay"></div>18 </div>19 </form>20 </body>21 </html>22 <script type="text/javascript">23 window.onload = function () {24 $.ajax({25 url: "ddlTest1.ashx",26 type: "post",27 async: false,28 success: function (data) {29 if (data != "") {30 $("#ddlDisplay").html(data);31 }32 }33 });34 35 }36 </script>本人想了半天只想出了这两种方法，欢迎补充，多多学习。
在下拉列表中显示多个字段的两种方法
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