/// <summary>
    /// 实体
    /// </summary>
    [XmlRoot("Peoples")]
    public class Peoples
    {
        List<People> items;

        [XmlElement("People")]
        public List<People> Items
        {
            get { return items; }
            set { items = value; }
        }

        public String ToJson()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("{\"Peoples\":[");
            foreach (People p in items)
            {
                sb.AppendFormat("{0},", p.ToJson());
            }
            if (Items.Count > 0)
                --sb.Length;
            sb.Append("]}");
            return sb.ToString();
        }
    }



/// <summary>
    /// 实体
    /// </summary>
    public class People
    {
        String name;
        [XmlAttribute]
        public String Name
        {
            get { return name; }
            set { name = value; }
        }
        Int32 age;
        [XmlAttribute]
        public Int32 Age
        {
            get { return age; }
            set { age = value; }
        }
        String sex;
        [XmlAttribute]
        public String Sex
        {
            get { return sex; }
            set { sex = value; }
        }

        public String ToJson()
        {
            return String.Concat("{ \"Name\":\"" + Name + "\",\"Age\":" + Age + ",\"Sex\":\"" + Sex + "\"}");
        }
    }

    /// <summary>
    /// ashx，后台代码
    /// </summary>
    public class GetPeoples : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            String xmlPath = context.Server.MapPath("../data.xml");
            System.Xml.Serialization.XmlSerializer serializer = new XmlSerializer(typeof(Peoples));
            Peoples p = null;
            using (FileStream fs = File.OpenRead(xmlPath))
            {
                p = serializer.Deserialize(fs) as Peoples;
            }
            context.Response.Write(p.ToJson());
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

                $.ajax({
                    "url": "Services/GetPeoples.ashx",
                    "dataType": "json",
                    "success": function (result) {
                       
                    }
                });

<?xml version="1.0" encoding="utf-8" ?>
<Peoples>
  <People Name="张三" Age="18" Sex="男"></People>
  <People Name="张三" Age="15" Sex="女"></People>
  <People Name="张三" Age="28" Sex="男"></People>
  <People Name="张三" Age="18" Sex="男"></People>
  <People Name="张三" Age="48" Sex="女"></People>
</Peoples>