getJson+ashx实现数据交互（入门级，c#）

最新推荐文章于 2023-10-31 15:29:00 发布

原创最新推荐文章于 2023-10-31 15:29:00 发布

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前台页面：

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

<!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 id="Head1" runat="server">
    <title>getJson+ashx实现数据交互（入门级）</title>
    <%--引用jQuery框架，有时jQuery框架不对，会出现无法getJson无法调用ashx页面--%>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            $.getJSON(
                "Handler/nameData.ashx",
                {type: "1"},
                function(json) {
                  $.each(json, function(i) {
                    $("#cat-list").append("<li>id:" + json[i].id + "  title:" + json[i].title + "</li>")  //json为从ashx页面回传的值
                  })
                });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div id="categories">
    <ul id="cat-list"></ul>
    </div>
    </form>
</body>
</html>

ashx页面

<%@ WebHandler Language="C#" Class="nameData" %>

using System;
using System.Web;
using System.Data;
using System.Text;
using System.Data.Common;
using mshopClass;

public class nameData : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";

        //调试
        //string data = "[{id:1,title:\"33F2845A-78C1-4F23-9185-06A7ABA69540\"},{id:2,title:\"3921750C-428F-451F-B90F-1EBF6B2B1B8C\"},{id:3,title:\"BC8133D0-85F3-4043-B457-449087523824\"},{id:4,title:\"E0332DA0-E8B4-44E6-8053-90AF681ED7B9\"},{id:5,title:\"C8D9A1D5-8052-446B-A889-27ED7F903D96\"}]";  //调试
        StringBuilder tb = new StringBuilder();
        string sql3 = "select top 30 id,title,cdate from test";
        DataTable dt3 = mallCtr.SqlTable(sql3);
        tb.Append(DataTableToJSON(dt3));  //将DataTabel转换成json格式
        context.Response.Write(tb.ToString());  //将数据回传到test.aspx页面,json格式不正确，数据不能正常返回给前台页面
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

    /// <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 DataTableToJSON(DataTable dt)
    {
        StringBuilder jsonBuilder = new StringBuilder();
        jsonBuilder.Append("[");
        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();
    }
}

实例下载地址：getJson+ashx实现数据交互实例下载