通过HttpClient来调用Web Api接口~续~实体参数的传递

并且我们知道了Post,Put方法只能有一个FromBody参数，再有多个参数时，上讲提到，需要将它封装成一个对象进行传递，而这讲主要围绕这个话题来说，接口层添加一个新类User_Info，用来进行数据传递，而客户端使用网页ajax和控制台HttpClient的方式分别进行实现，Follow me！

下面定义一个复杂类型对象

   public class User_Info
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Info { get; set; }
    }

下面修改上次的api部分，让它对这个对象进行操作

    [CorsAttribute("http://localhost:3321")]
    public class RegisterController : ApiController
    {
        public static List<User_Info> Model = new List<User_Info>()
        {
            new User_Info{Id=1,Name="zzl",Info="zzl是楼主"},
            new User_Info{Id=2,Name="zhz",Info="zhz是zzl的儿子"},
            new User_Info{Id=3,Name="zql",Info="zql是zzl的妻子"},
            new User_Info{Id=4,Name="bobo",Info="bobo是zzl的朋友"}
        };

        // GET api/values
        public IEnumerable<User_Info> Get()
        {
            return Model;
        }
        // GET api/values/5
        public User_Info Get(int id)
        {
            var entity = Model.FirstOrDefault(i => i.Id == id);
            return entity;
        }
        // GET api/values/5?leval=1
        public HttpResponseMessage Get(int id, int leval)
        {
            return new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent("<em style='color:red'>成功响应(id,level)</em>", System.Text.Encoding.UTF8, "text/html")
            };
        }
        // POST api/values
        public HttpResponseMessage Post([FromBody]User_Info value)
        {
            Model.Add(new User_Info
            {
                Id = value.Id,
                Info = value.Info,
                Name = value.Name,
            });
            //用户登陆相关
            return new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent("添加数据成功,用户ID：" + value.Id, System.Text.Encoding.UTF8, "text/plain")
            };
        }
        // PUT api/values?userid=5
        public HttpResponseMessage Put(int userid, [FromBody]User_Info value)
        {
            var entity = Model.FirstOrDefault(i => i.Id == userid);
            entity.Info = value.Info;
            entity.Name = value.Name;
            return new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent("修改数据成功,主键：" + userid + ",对象：" + value.Name)
            };
        }

        // DELETE api/values/5
        public HttpResponseMessage Delete(int id)
        {
            Model.Remove(Model.FirstOrDefault(i => i.Id == id));
            return new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent("删除数据成功")
            };
        }

而最关键的地方还是在各个客户端调用的时候，首先，你不能指望客户端去引用你的程序集，因为，不能平台无法实现这种引用（java & c#,js & C#,php & c#)，所以，在调用时需要有它们各自的方法，而JS的ajax调用时，直接使用json对象即可，键名对象

实体的属性，在使用HttpClient时，直接为FormUrlEncodedContent对象赋一个键值对的集合即可，下面分别介绍一下

HTML的JS实现

     $.ajax({
            url: "http://localhost:52824/api/register",
            type: "POST",
            data: { Id: 5, Name: '新来的', Info: '大家好' },//这里键名称必须为空，多个参数请传对象，api端参数名必须为value
            success: function (data) {
                console.log("post:" + data);
            }
        });

        $.ajax({
            url: "http://localhost:52824/api/register",
            type: "GET",
            success: function (data) {
                for (var i in data) {
                    console.log(data[i].Id + " " + data[i].Name);
                }
            }
        });

结果截图

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DJSupJV6qQUk449VUppYNSnlp2oqLOGK1Ulcgbe2uBXwQ0mmJS3wMAjmD5etJGS688Wv8F/0opKYXUVVUZo5XSVWUqrav28n5zLSeZN8GqeqeQNwAwhxXUk55S9blSRT34sWmgldKqKOx/za0DNmFs7MR506xnYIox5A0AzGIV9aSnVH22UeRSRCtVef/Vk7SSqqpHOe39abZR7361ekQTT/Ev6fCHPABwXCdTT9oFi42JnpNg7V98NqOU9B+KAgDWjefZAAByIG8AADmQNwCAHMgbAEAO1JMGAOTA+AYAkAN5AwDIgbwBAOTwf6NZ86DAqT09AAAAAElFTkSuQmCC" alt="" />

Console程序中使用HttpClient对象进行实现

    　　 /// <summary>
  　     /// HttpClient实现Post请求
        /// </summary>
        static async void dooPost()
        {
            string url = "http://localhost:52824/api/register";
             //设置HttpClientHandler的AutomaticDecompression
            var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
            //创建HttpClient（注意传入HttpClientHandler）
            using (var http = new HttpClient(handler))
            {
                //使用FormUrlEncodedContent做HttpContent
                var content = new FormUrlEncodedContent(new Dictionary<string, string>()
                {    {"Id","6"},
                     {"Name","添加zzl"},
                     {"Info", "添加动作"}//键名必须为空
                 });

                //await异步等待回应

                var response = await http.PostAsync(url, content);
                //确保HTTP成功状态值
                response.EnsureSuccessStatusCode();
                //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                Console.WriteLine(await response.Content.ReadAsStringAsync());
            }

        }
        /// <summary>
        /// HttpClient实现Get请求
        /// </summary>
        static async void dooGet()
        {
            string url = "http://localhost:52824/api/register?id=1";
            //创建HttpClient（注意传入HttpClientHandler）
            var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };

            using (var http = new HttpClient(handler))
            {
                //await异步等待回应
                var response = await http.GetAsync(url);
                //确保HTTP成功状态值
                response.EnsureSuccessStatusCode();

                //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                Console.WriteLine(await response.Content.ReadAsStringAsync());
            }
        }
        /// <summary>
        /// HttpClient实现Put请求
        /// </summary>
        static async void dooPut()
        {
            var userId = 1;
            string url = "http://localhost:52824/api/register?userid=" + userId;

            //设置HttpClientHandler的AutomaticDecompression
            var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
            //创建HttpClient（注意传入HttpClientHandler）
            using (var http = new HttpClient(handler))
            {
                //使用FormUrlEncodedContent做HttpContent
                var content = new FormUrlEncodedContent(new Dictionary<string, string>()
                {
                   {"Name","修改zzl"},
                   {"Info", "Put修改动作"}//键名必须为空
                });

                //await异步等待回应

                var response = await http.PutAsync(url, content);
                //确保HTTP成功状态值
                response.EnsureSuccessStatusCode();
                //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                Console.WriteLine(await response.Content.ReadAsStringAsync());
            }

        }

转：http://www.cnblogs.com/lori/p/4045633.html