webform中 ajax调用后台方法(非webservice)

方法一：通过创建一个没有内容的窗体

后台：

 public partial class Ajax_ShoppingCart : System.Web.UI.Page
    {
        bookdbDataContext bdc = Connect.bookdb();
        protected void Page_Load(object sender, EventArgs e)
        {
            if(!IsPostBack)
            {
                if(Request.Form["method"]!=null)
                {
                    switch (Request.Form["method"].ToString())
                    {
                        //添加商品至购物车
                        case "addToCart":
                            Response.Write(addToCart());
                            break;
                        //获得购物车
                        case "showCart":
                            Response.Write(showCart());
                            break;
                        //从购物车中删除商品
                        case "removeCart":
                            Response.Write(removeCart());
                            break;
                        //减少购物车中某一商品的数量
                        case "redCount":
                            Response.Write(redCount());
                            break;
                        //增加购物车中某一商品的数量
                        case "addCount":
                            Response.Write(addCount());
                            break;
                        default:
                            break;
                    }
                }
            }
        }

        protected string tid
        {
            get
            {
                if (Request.Form["tid"] != null)
                {
                    return Request.Form["tid"].ToString();
                }
                else
                {
                    return "";
                }
            }
        }
        /// <summary>
        /// 添加至购物车
        /// </summary>
        /// <returns></returns>
        protected string addToCart()
        {
            int Count = 0;
            string message = string.Empty;
            if (Request.Form["count"] != null)
            {
                Int32.TryParse(Request.Form["count"].ToString(), out Count);
            }
            if (Count > 5 || Count < 1)
            {
                return JsonConvert.SerializeObject(new { status = 0, message = "书籍数量不对，不能超过5张哦" });
            }
            var tic = bdc.Book.SingleOrDefault(obj => obj.ID == Convert.ToInt32(tid));
            if (tic != null)
            {
                Common.Book t = new Common.Book();
                t.ID = tid;
                t.Count = Count;
                t.Name = tic.Name;
                t.Price = tic.Price;
                int result = ShoppingCartHelper.addCart(t);
                switch (result)
                {
                    case -2:
                        return JsonConvert.SerializeObject(new { status = 0, message = "同一书籍不能购买超过5本哦！" });
                    case 1:
                        return JsonConvert.SerializeObject(new { status = 1, cart = ShoppingCartHelper.getShoppingCart(), message = "成功加入购物车！" });
                    default:
                        return null;
                }
            }
            else
            {
                return JsonConvert.SerializeObject(new { status = 0, message = "不存在此书籍，请您重新选择！" });
            }
        }

        /// <summary>
        /// 获得购物车
        /// </summary>
        /// <returns></returns>
        protected string showCart()
        {
            return JsonConvert.SerializeObject(new { cart = ShoppingCartHelper.getShoppingCart() });
        }

        /// <summary>
        /// 从购物车中移除商品
        /// </summary>
        /// <returns></returns>
        protected string removeCart()
        {
            int result = ShoppingCartHelper.removeCart(tid);
            switch (result)
            {
                case -1:
                    return JsonConvert.SerializeObject(new { status = 0, message = "离开太久啦，购物车已经空空了，您重新购买吧" });
                default:
                    return JsonConvert.SerializeObject(new { status = 1, cart = ShoppingCartHelper.getShoppingCart() });
            }
        }

        /// <summary>
        /// 减少购物车中某一件商品的数量
        /// </summary>
        /// <returns></returns>
        protected string redCount()
        {
            int result = ShoppingCartHelper.reduceCart(tid);
            switch (result)
            {
                case -1:
                    return JsonConvert.SerializeObject(new { status = 0, message = "离开太久啦，购物车已经空空了，您重新购买吧" });
                default:
                    return JsonConvert.SerializeObject(new { status = 1, cart = ShoppingCartHelper.getShoppingCart() });
            }
        }

        /// <summary>
        /// 增加购物车中某一件商品的数量
        /// </summary>
        /// <returns></returns>
        protected string addCount()
        {
            int result = ShoppingCartHelper.addCart(tid);
            switch (result)
            {
                case -1:
                    return JsonConvert.SerializeObject(new { status = 0, message = "离开太久啦，购物车已经空空了，您重新购买吧" });
                default:
                    return JsonConvert.SerializeObject(new { status = 1, cart = ShoppingCartHelper.getShoppingCart() });
            }
        }
    }

前台:

function ShowNewList(d,t) {
    var _url = "/Data_ajax/Ajax_ShoppingCart.aspx";//Data_ajax只是一个文件夹名字，随便怎么取，但是，该页面的aspx界面中，不能出现空格和内容，就是一个空的界面什么对没有
    var obj = {
        method: "addToCart",
        Id: d //在后台可以用Reques.Form["Id"]获取参数值
    };
    jQuery.ajax({
        type: "POST",
        url: _url,
        data: obj,
        dataType: "json",
        success: function (x) {
            ShowNewList1(x);
        }
    });
}

购物车类:

namespace Ipow.CMS.Helper
{
    public static class ShoppingCartHelper
    {
        /// <summary>
        /// 获取购物车
        /// </summary>
        /// <returns></returns>
        public static shoppingCart getShoppingCart()
        {
            shoppingCart cart = new shoppingCart();
            if (HttpContext.Current.Session["cart"] != null)
            {
                cart = HttpContext.Current.Session["cart"] as shoppingCart;
            }
            return cart;
        }

        /// <summary>
        /// 加入购物车
        /// </summary>
        /// <param name="tic">门票</param>
        /// <param name="CategoryID">门票类别</param>
        /// <returns></returns>
        public static int addCart(ticket tic, int CategoryID)
        {
            int result = 1;
            shoppingCart cart = getShoppingCart();
            if (cart.CategoryID == 0)
            {
                cart.CategoryID = CategoryID;
                cart.TotalPrice = tic.ticketPrice * tic.ticketCount;
                List<ticket> list = new List<ticket>();
                list.Add(tic);
                cart.tickets = list;
            }
            else
            {
                if (cart.CategoryID != CategoryID && cart.tickets.Count() != 0)
                {
                    //不同园区门票不能加入同一个购物车
                    result = -1;
                }
                else
                {
                    ticket t1 = cart.tickets.SingleOrDefault(obj => obj.ticketID == tic.ticketID);
                    //如果已存在同样的门票，则增加门票数量
                    if (t1 != null)
                    {
                        if (t1.ticketCount + tic.ticketCount <= 5)
                        {
                            t1.ticketCount += tic.ticketCount;
                            cart.TotalPrice += tic.ticketPrice * tic.ticketCount;
                            cart.CategoryID = CategoryID;
                        }
                        else
                        {
                            //门票数量超过5张
                            result = -2;
                        }
                    }
                    //不存在则添加
                    else
                    {
                        cart.TotalPrice += tic.ticketPrice * tic.ticketCount;
                        cart.CategoryID = CategoryID;
                        cart.tickets.Add(tic);
                    }
                }
            }
            HttpContext.Current.Session["cart"] = cart;
            return result;
        }

        /// <summary>
        /// 从购物车中移除商品
        /// </summary>
        /// <param name="tic">要移除的商品ID</param>
        /// <returns></returns>
        public static int removeCart(string tid)
        {
            shoppingCart cart = getShoppingCart();
            if (cart.CategoryID == 0)
            {
                //离开太久啦，购物车已经空空了，您重新购买吧
                return -1;
            }
            else
            {
                ticket t1 = cart.tickets.SingleOrDefault(obj => obj.ticketID == tid);
                if (t1 != null)
                {
                    //重新计算总价
                    cart.TotalPrice -= t1.ticketPrice * t1.ticketCount;
                    //从购物车中移除
                    cart.tickets.Remove(t1);
                }
            }
            HttpContext.Current.Session["cart"] = cart;
            return 1;
        }

        /// <summary>
        /// 减少购物车中某一商品的数量
        /// </summary>
        /// <param name="tic">要减少数量的商品id</param>
        /// <returns></returns>
        public static int reduceCart(string tid)
        {
            shoppingCart cart = getShoppingCart();
            if (cart.CategoryID == 0)
            {
                //离开太久啦，购物车已经空空了，您重新购买吧
                return -1;
            }
            else
            {
                ticket t1 = cart.tickets.SingleOrDefault(obj => obj.ticketID == tid);
                if (t1 != null)
                {
                    if (t1.ticketCount > 1)
                    {
                        //从购物车中减少某一商品的数量
                        t1.ticketCount--;
                        //重新计算总价
                        cart.TotalPrice -= t1.ticketPrice;
                    }
                }
            }
            HttpContext.Current.Session["cart"] = cart;
            return 1;
        }

        /// <summary>
        /// 增加购物车中某一商品的数量
        /// </summary>
        /// <param name="tic">要减少数量的商品id</param>
        /// <returns></returns>
        public static int addCart(string tid)
        {
            shoppingCart cart = getShoppingCart();
            if (cart.CategoryID == 0)
            {
                //离开太久啦，购物车已经空空了，您重新购买吧
                return -1;
            }
            else
            {
                ticket t1 = cart.tickets.SingleOrDefault(obj => obj.ticketID == tid);
                if (t1 != null)
                {
                    if (t1.ticketCount < 5)
                    {
                        //从购物车中减少某一商品的数量
                        t1.ticketCount++;
                        //重新计算总价
                        cart.TotalPrice += t1.ticketPrice;
                    }
                }
            }
            HttpContext.Current.Session["cart"] = cart;
            return 1;
        }
    }
    /// <summary>
    /// 购物车
    /// </summary>
    public class shoppingCart
    {
        /// <summary>
        /// 门票类别ID
        /// </summary>
        public int CategoryID { get; set; }
        /// <summary>
        /// 总价
        /// </summary>
        public decimal? TotalPrice { get; set; }
        /// <summary>
        /// 门票列表
        /// </summary>
        public List<ticket> tickets { get; set; }
    }
    /// <summary>
    /// 门票
    /// </summary>
    public class ticket
    {
        public string ticketID { get; set; }
        /// <summary>
        /// 门票名称
        /// </summary>
        public string ticketName { get; set; }
        /// <summary>
        /// 门票数量
        /// </summary>
        public int ticketCount { get; set; }
        /// <summary>
        /// 门票价格
        /// </summary>
        public decimal? ticketPrice { get; set; }
    }
}

方法二：在方法上加[Webservice]，方法必须是静态，static

后台：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;

namespace WebApplication1.BookManage
{
    public partial class test : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        [WebMethod]
        public static string SayHello(string str,string str2)
        {
            return str+str2;
        }
    }
}

前台:

Js中：
$(function () {
    $("#btnOK").click(function () {
        $.ajax({
            type: "post",
            url: "test.aspx/SayHello",
            data: "{'str':'我是','str2':'XXX'}",
            contentType: "application/json",
            dataType: "json",
            success: function (r) {
                alert(r.d);
            },
            error: function (e) {
                alert("错误是:" + e.responseText);
            }
        });
        return false;
    });
})

界面：
<form id="form1" runat="server">
        <input type="button" value="调用后台方法" id="btnOK"/>
 </form>

方法三：一般处理程序

前台：

JS:
function strToJson(str) {
    var json = eval('(' + str + ')');
    return json;
}
 $("#btnone").click(function () {
        $.ajax({
            type:"post",
            url: "/Ajax_Data/Handler.ashx",
            data: {method:"a"},
            dataType: "text",
            success: function (r) {
                var obj = strToJson(r);
                alert(obj.name+"   "+obj.age);
            },
            error: function (e) {
                alert("错误:"+e.responseText);
            }
        });
    });

界面：
 <input type="button" value="使用一般处理程序调用后台" id="btnone" />

后台：

 /// <summary>
    /// Handler 的摘要说明
    /// </summary>
    public class Handler : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            char charmehod = Convert.ToChar(context.Request.Params["method"]);
            context.Response.ContentType = "text/plain";
            
            switch (charmehod)
            {
                case 'a':
                    context.Response.Write("{name:'魔女小溪',age:'22' }");
                    break;
                case 'b':
                    context.Response.Write("document.write("This is b samply");");
                    break;
                default:
                    break;
            }
            context.Response.Flush();
           
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }