Asp.net 2.0 一个简单的联动DropDownList示例(示例代码下载)

(一). 示例图片 (二). 详细代码     1. 页面前台代码    1 < body >  2      < form id = " form1 "  runat = " server " >  3      < div >  4          & nbsp; & nbsp; < asp:Panel ID = " Panel2 "  runat = " server "  BackColor = " #FFC080 "  Font - Size = " X-Large "  5             ForeColor = " #C04000 "  Height = " 50px "  Width = " 387px " >  6             DropDownList 联动示例： </ asp:Panel >  7          < asp:Panel ID = " Panel1 "  runat = " server "  BackColor = " #C0C0FF "  Height = " 170px "  Width = " 387px " >  8              < br  />  9             请选择类别: < br  /> 10              < br  /> 11              & nbsp; 12              < asp:DropDownList ID = " ddl1 "  runat = " server " > 13              </ asp:DropDownList >& nbsp; 14              < asp:DropDownList ID = " ddl2 "  runat = " server " > 15              </ asp:DropDownList >& nbsp; 16              < asp:DropDownList ID = " ddl3 "  runat = " server " > 17              </ asp:DropDownList >& nbsp; & nbsp; < br  /> 18              < br  /> 19              & nbsp; 20              < C1:RelatedList id = " rl1 "  runat = " server " ></ C1:RelatedList >      21              < asp:Button ID = " btOK "  runat = " server "  OnClick = " Button1_Click "  Text = " 取值 "  Width = " 67px "   /> 22          </ asp:Panel > 23          </ div > 24      </ form > 25 </ body > 26

    2.页面后台代码

  1 protected   void  Page_Load( object  sender, EventArgs e)   2      {  3        if (!Page.IsPostBack)  4        {              5            ArrayList Category = new ArrayList();  6            Category.Add("ddl1");  7            Category.Add("ddl2");  8            Category.Add("ddl3");  9 10            //Method 1. 指定XML文件路径 11            rl1.DataSource = @"Category.xml";             12 13            /**/////Method 2. 指定数据源为DataSet对象 14            //DataSet ds = new DataSet();             15            //ds = GetData();             16            //rl1.DataSource = ds; 17 18 19            rl1.ListID = Category; 20            rl1.DataBind(); 21 22        } 23    }  24      private  DataSet GetData()  25      { 26        DataSet ds = new DataSet(); 27        DataTable dt = new DataTable(); 28        dt.Columns.Add(new DataColumn("Value", typeof(int))); 29        dt.Columns.Add(new DataColumn("Context", typeof(string))); 30        dt.Columns.Add(new DataColumn("ParentValue", typeof(int))); 31        DataRow drNew = dt.NewRow(); 32        drNew["Value"] = 1; 33        drNew["Context"] = "水果"; 34        drNew["ParentValue"] = 0; 35        dt.Rows.Add(drNew); 36 37        drNew = dt.NewRow(); 38        drNew["Value"] = 2; 39        drNew["Context"] = "动物"; 40        drNew["ParentValue"] = 0; 41        dt.Rows.Add(drNew); 42 43        drNew = dt.NewRow(); 44        drNew["Value"] = 3; 45        drNew["Context"] = "葡萄"; 46        drNew["ParentValue"] = 1; 47        dt.Rows.Add(drNew); 48 49        drNew = dt.NewRow(); 50        drNew["Value"] = 7; 51        drNew["Context"] = "红葡萄"; 52        drNew["ParentValue"] = 3; 53        dt.Rows.Add(drNew); 54 55        drNew = dt.NewRow(); 56        drNew["Value"] = 8; 57        drNew["Context"] = "柴葡萄"; 58        drNew["ParentValue"] = 3; 59        dt.Rows.Add(drNew); 60 61        drNew = dt.NewRow(); 62        drNew["Value"] = 4; 63        drNew["Context"] = "桔子"; 64        drNew["ParentValue"] = 1; 65        dt.Rows.Add(drNew); 66 67        drNew = dt.NewRow(); 68        drNew["Value"] = 12; 69        drNew["Context"] = "红桔子"; 70        drNew["ParentValue"] = 4; 71        dt.Rows.Add(drNew); 72 73        drNew = dt.NewRow(); 74        drNew["Value"] = 13; 75        drNew["Context"] = "绿桔子"; 76        drNew["ParentValue"] = 4; 77        dt.Rows.Add(drNew); 78 79        drNew = dt.NewRow(); 80        drNew["Value"] = 5; 81        drNew["Context"] = "香蕉"; 82        drNew["ParentValue"] = 1; 83        dt.Rows.Add(drNew); 84 85        drNew = dt.NewRow(); 86        drNew["Value"] = 14; 87        drNew["Context"] = "马"; 88        drNew["ParentValue"] = 2; 89        dt.Rows.Add(drNew); 90 91        drNew = dt.NewRow(); 92        drNew["Value"] = 15; 93        drNew["Context"] = "红马"; 94        drNew["ParentValue"] = 14; 95        dt.Rows.Add(drNew); 96 97        drNew = dt.NewRow(); 98        drNew["Value"] = 16; 99        drNew["Context"] = "白马";100        drNew["ParentValue"] = 14;101        dt.Rows.Add(drNew);102103        drNew = dt.NewRow();104        drNew["Value"] = 17;105        drNew["Context"] = "蓝马";106        drNew["ParentValue"] = 14;107        dt.Rows.Add(drNew);108109        drNew = dt.NewRow();110        drNew["Value"] = 18;111        drNew["Context"] = "牛";112        drNew["ParentValue"] = 2;113        dt.Rows.Add(drNew);      114115        ds.Tables.Add(dt);116        return ds;117    } 118      protected   void  Button1_Click( object  sender, EventArgs e) 119      {120        Response.Write("<script>alert('" + this.ddl1.SelectedItem.Text + "," + this.ddl2.SelectedItem.Text + "," + 121                                           this.ddl3.SelectedItem.Text + "');</script>");               122} 123

  (三).示例代码下载

         http://www.cnblogs.com/Files/ChengKing/LinkageDropDownList.rar