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jQuery、Ajax,DataTable数据如何转换成Json格式

2012-11-05 16:15 489 查看

在使用JQery的Ajax功能时经常要获取数据,而Net中获取的数据经常方便的就是DataTable

而JQuery要Json格式:这样就是转换可以利用以下这个方法进行

/// <summary>
/// DataTable转成Json数据
/// </summary>
public static class DataTableToJSON
{
/// <summary>
/// 将dt转化成Json数据格式如 table[{id:1,title:'体育'},id:2,title:'娱乐'}]
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string DtToSON(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("recordcount:" + dt.Rows.Count + ",table: [");
for (int i = 0; i < dt.Rows.Count; i++)
{
if (i > 0)
jsonBuilder.Append(",");
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
if (j > 0)
jsonBuilder.Append(",");
jsonBuilder.Append(dt.Columns[j].ColumnName.ToLower() + ": '" + dt.Rows[i][j].ToString().Replace("\t", " ").Replace("\r", " ").Replace("\n", " ").Replace("\'", "\\\'") + "'");
}
jsonBuilder.Append("}");
}
jsonBuilder.Append("]");
return jsonBuilder.ToString();
}
}

/////////////////////////////////////////////前台jqery如何使用请看下面的实现方法//////////////////////////////////////////////////

前台页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ClassNameByJSON.aspx.cs" Inherits="ClassName" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script language="javascript" type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script language="javascript" type="text/javascript">
$(function(){
$("#DropDownList1").change(function(){
//获取值测试
// alert($("#DropDownList1").val());
//ajax获取数据
$("#DropDownList2").html("");
$("#DropDownList2").append("<option value=\"0\">--请选择学生--</option>");
$.get("GetStudent.ashx",{action:"get",className:$("#DropDownList1").val()},function(data){
//服务器处理后执行，数据由data传回
var jsJosn=eval('('+data+')');
//alert(jsJosn.stuentscount);
//alert(jsJosn.stuents[0].stuName);

for(var i=0;i<jsJosn.stuentscount;i++){
$("#DropDownList2").append("<option value=\""+jsJosn.stuents[i].id+"\">"+jsJosn.stuents[i].stuName+"</option>");
}
});
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
DataTextField="ClassName" DataValueField="Id" Width="183px" AppendDataBoundItems="True">
<asp:ListItem Value="0">--请选择班级--</asp:ListItem>
</asp:DropDownList><asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:AjaxDemoConnectionString %>"
SelectCommand="SELECT * FROM [ClassInfo]"></asp:SqlDataSource>
<asp:DropDownList ID="DropDownList2" runat="server" AppendDataBoundItems="True" Width="168px">
<asp:ListItem Value="0">-请选择学生-</asp:ListItem>
</asp:DropDownList></div>
</form>
</body>
</html>

获取数据利用.ashx文件

<%@ WebHandler Language="C#" class="GetStudent" %>

using System;
using System.Web;
using System.Data.SqlClient;
using System.Data;
using System.Text;
public class GetStudent : IHttpHandler {
//通过请求获取学生，返回json对象
public void ProcessRequest (HttpContext context) {
string classVale = context.Request.Params["className"];
SqlConnection sqlconn = new SqlConnection();
sqlconn.ConnectionString = @"server=CB2E66F752294E9\SQLEXPRESS;database=ajaxdemo;uid=sa;pwd=sa";
SqlCommand sqlcomm = new SqlCommand();
sqlcomm.Connection = sqlconn;
sqlcomm.CommandText = "select * from dbo.StudentInfo where ClassId=" + int.Parse(classVale);
SqlDataAdapter adp = new SqlDataAdapter(sqlcomm);
DataSet set = new DataSet();
adp.Fill(set);
//包装成JSON格式
//例如：{stuentscount:10,stuents:[{id:1,stuName:"张三"},{id:2,stuName:"李四"}]}
if (set.Tables[0].Rows.Count == 0)
{
context.Response.Write("0");
}
else
{
StringBuilder sb = new StringBuilder();
sb.Append("{stuentscount:"+set.Tables[0].Rows.Count+",stuents:[");
for (int i = 0; i < set.Tables[0].Rows.Count; i++)
{
sb.Append("{id:" + set.Tables[0].Rows[i]["Id"].ToString() + ",stuName:\""+set.Tables[0].Rows[i]["StudentName"].ToString()+"\"}");
if (i != set.Tables[0].Rows.Count - 1) {
sb.Append(",");
}
}
sb.Append("]}");
context.Response.Write(sb.ToString());
}
}

public bool IsReusable {
get {
return false;
}
}

}

#Jquery

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