WebAPI示例

一、新建项目

 二、

代码：

　　Models.Products实体类　　

    public class Product
    {
        /// <summary>
        /// 产品编号
        /// </summary>
        public int Pid { get; set; }
        /// <summary>
        /// 产品名称
        /// </summary>
        public string Name { get; set; }
        /// <summary>
        /// 产品价格
        /// </summary>
        public decimal Price { get; set; }
        /// <summary>
        /// 产品库存
        /// </summary>
        public int  Stock { get; set; }
    }

　　ProductsController类　　

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using WebApiDemo.Infrastructure;
using WebApiDemo.Models;

namespace WebApiDemo.Controllers
{
    public class ProductsController : ApiController
    {
        //推荐使用锁机制，能有效规避多线程时创建多个实例问题。
        private ProductRespository respo = ProductRespository.CurrentLock;

        public IEnumerable<Product> Get()
        {
            return respo.GetAll();
        }

        public Product Get(int pid)
        {
            return respo.GetOneById(pid);
        }

      

        public Product Post(Product product)
        {           
            if (ModelState.IsValid)
            {
                product = respo.AddOne(product);
            }
            return product;
        }


        public bool Put(Product product)
        {
            if (ModelState.IsValid)
            {
                return respo.Update(product);
            }
            return false;
        }
        
        public bool Delete(int pid)
        {
            return respo.Remove(pid);
        }

    }
}

　　Infrastructure.ProductRespository类　　

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using WebApiDemo.Models;

namespace WebApiDemo.Infrastructure
{
    public sealed class ProductRespository
    {

        //单例模式,先创建型(饿汉)
        private static ProductRespository _currentHungry = new ProductRespository();
        public static ProductRespository CurrentHungry
        {
            get { return _currentHungry; }
        }

        //单例模式，按需创建型(懒汉)
        //单例模式,先创建型(饿汉)
        private static ProductRespository _currentLazy = null;
        public static ProductRespository CurrentLazy
        {
            get
            {
                return _currentLazy ?? (_currentLazy = new ProductRespository());
            }
        }

        //单例模式，锁机制
        private static object lockobj = new object();
        private static ProductRespository _currentLock = null;
        public static ProductRespository CurrentLock
        {
            get
            {
                if (_currentLock == null)
                {
                    lock (lockobj)
                    {
                        if (_currentLock == null)
                        {
                            _currentLock = new ProductRespository();
                        }
                    }
                }
                return _currentLock;
            }
        }


        private List<Product> products = new List<Product>() {
            new Product{ Pid=1,Name="Product1",Price=20.23M,Stock=10},
            new Product{ Pid=2,Name="Product2",Price=10.23M,Stock=0},
            new Product{ Pid=3,Name="Product3",Price=100,Stock=5},
            new Product{ Pid=4,Name="Product4",Price=20,Stock=20},
        };

        /// <summary>
        /// 获得所有产品
        /// </summary>
        /// <returns></returns>
        public IEnumerable<Product> GetAll()
        {
            return products;
        }

        /// <summary>
        /// 根据ID选择产品
        /// </summary>
        /// <param name="pid">产品ID</param>
        /// <returns></returns>
        public Product GetOneById(int pid)
        {
            var selected = products.Where(p => p.Pid == pid).FirstOrDefault();
            return selected;
        }

        /// <summary>
        /// 加入对象操作
        /// </summary>
        /// <param name="newitem"></param>
        /// <returns></returns>
        public Product AddOne(Product newitem)
        {
            newitem.Pid = products.Count + 1;
            products.Add(newitem);
            return newitem;
        }

        /// <summary>
        /// 根据ID删除对象
        /// </summary>
        /// <param name="pid">待删除的对象的编号</param>
        /// <returns></returns>
        public bool Remove(int pid)
        {
            var item = GetOneById(pid);
            if (item != null)
            {
                products.Remove(item);
                return true;
            }
            return false;
        }

        /// <summary>
        /// 更新产品操作
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public bool Update(Product item)
        {
            var olditem = GetOneById(item.Pid);
            if (olditem != null)
            {
                products.Remove(olditem);
                products.Add(item);
                return true;
            }
            else
            {
                return false;
            }
        }

    }
}

　　测试页面内容

　　

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Demo</title>
    <link href="~/Content/bootstrap.min.css" rel="stylesheet" />
    <link href="~/Content/Site.css" rel="stylesheet" />
    <script src="~/Scripts/jquery-1.10.2.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $("#getAllJson").click(function () {              
                AjaxHelper("get", "", "", function (data) {
                    $("#result").html(JSON.stringify(data));
                })
            });
            $("#getAllXml").click(function () {
                AjaxHelper("get", "", "XML", function (data) {
                    var oSerializer = new XMLSerializer();
                    var sXML = oSerializer.serializeToString(data);                   
                    $("#result").html(sXML);
                })
            });
            $("#getOneJson").click(function () {                
                AjaxHelper("get", { "pid": 1 }, "Json", function (data) {
                    $("#result").html(JSON.stringify(data));
                })
            });
            $("#postOneXml").click(function () {
                AjaxHelper("post", { "Name": "Product5", "Price": 19.98, "Stock": 1 }, "Json", function (data) {
                    $("#result").html(JSON.stringify(data));
                })
            });
            $("#putOneXml").click(function () {
                AjaxHelper("Put", { "Pid": 5, "Name": "Product5+", "Price": 19.98, "Stock": 1 }, "Json", function (data) {
                    $("#result").html(JSON.stringify(data));
                })
            });
            $("#delOneXml").click(function () {
                AjaxHelper("DELETE", "", "Json", function (data) {
                    $("#result").html(JSON.stringify(data));
                })
            });
          
        });

        function AjaxHelper(_method, _data, _datatype, _success)
        {
            $.ajax({
                url: "/Api/Products/5",
                type: _method||"get",
                data: _data,
                dataType: _datatype||"Json",
                success: _success
            });
        }
    </script>
</head>
<body>
    <div class="container">
        <div class="row">
        </div>
        <div class="row">
            <div class="btn-group">
                <button id="getAllJson" class="btn btn-default">获得所有(Json)</button>
                <button id="getAllXml" class="btn btn-default">获得所有(XML)</button>
                <button id="getOneJson" class="btn btn-default">获得(id=1)</button>
                <button id="postOneXml" class="btn btn-default">新建(post)</button>
                <button id="putOneXml" class="btn btn-default">更新()</button>
                <button id="delOneXml" class="btn btn-default">删除()</button>
            </div>
        </div>
        <div class="row">
            <div id="result">

            </div>
        </div>
    </div>
</body>
</html>

　　运行结果：

　　

至此一个完整的WebAPIDemo创建完成。