BigClass
表结构:
测试数据:
SmallClass1
表结构:
测试数据:
aspx页面 :
aspx代码:
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cs代码:
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using System;
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using System.Text;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Data.SqlClient;
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using System.Drawing;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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namespace AspNetTest.Common
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{
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/// <summary>
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/// liandong_two 的摘要说明。
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/// </summary>
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public class liandong_two : System.Web.UI.Page
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{
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protected System.Web.UI.WebControls.DropDownList DropDownList1;
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protected System.Web.UI.WebControls.DropDownList DropDownList2;
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private void Page_Load(object sender, System.EventArgs e)
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{
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BindDDLCreateJsdArray();
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// 在此处放置用户代码以初始化页面
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}
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private void BindDDLCreateJsdArray()
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{
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string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
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SqlConnection conn = new SqlConnection(ConnectionString);
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string sql = "select b.d_name as bname,b.d_id as bid,s.d_id as sid,s.d_name as sname from SmallClass1 s join BigClass b on s.d_classid=b.d_id";
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SqlCommand cmd = new SqlCommand(sql, conn);
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conn.Open();
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SqlDataReader dr = cmd.ExecuteReader();
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StringBuilder sb = new StringBuilder();
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sb.Append("<script language=javascript>\n");
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sb.Append("var arrSmallClass = new Array();\n");
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ListItem lt = new ListItem("=选择大类=", "");
DropDownList1.Items.Clear();
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DropDownList1.Items.Add(lt);
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lt = new ListItem("=选择小类=", "");
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DropDownList2.Items.Add(lt);
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int i = 0;
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int PreBigClassId = 0;
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while(dr.Read())
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{
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string BigClassName = dr["bname"].ToString();
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int BigClassId = Convert.ToInt32(dr["bid"].ToString());
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string SmallClassName = dr["sname"].ToString();
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int SmallClassID = Convert.ToInt32(dr["sid"].ToString());
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lt = new ListItem(BigClassName, BigClassId.ToString());
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if(BigClassId != PreBigClassId)
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{
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DropDownList1.Items.Add(lt);
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PreBigClassId = BigClassId;
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}
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sb.Append("arrSmallClass["+ i +"] = new Array();\n");
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sb.Append("arrSmallClass["+ i +"][0] = " + SmallClassID.ToString() + ";\n");
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sb.Append("arrSmallClass["+ i +"][1] = \"" + SmallClassName + "\";\n");
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sb.Append("arrSmallClass["+ i +"][2] = " + BigClassId + ";\n");
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i++;
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}
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sb.Append("</script>");
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Page.Response.Write(sb.ToString());
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DropDownList1.Attributes.Add("onchange", "change()");
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}
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Web 窗体设计器生成的代码
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}
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}
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