using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.IO;using System.Web;namespace WebAPIClientDemo{    public class RestClient    {        private string BaseUri;        public RestClient(string baseUri)        {            this.BaseUri = baseUri;        }        #region Delete方式        public string Delete(string data, string uri)        {            return CommonHttpRequest(data, uri, "DELETE");        }        public string Delete(string uri)        {            //Web访问对象64            string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri);            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);            myRequest.Method = "DELETE";            // 获得接口返回值68            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);            //string ReturnXml = HttpUtility.UrlDecode(reader.ReadToEnd());            string ReturnXml = reader.ReadToEnd();            reader.Close();            myResponse.Close();            return ReturnXml;        }        #endregion        #region Put方式        public string Put(string data, string uri)        {            return CommonHttpRequest(data, uri, "PUT");        }        #endregion        #region POST方式实现        public string Post(string data, string uri)        {            return CommonHttpRequest(data,uri,"POST");        }        public string CommonHttpRequest(string data, string uri,string type)        {            //Web访问对象，构造请求的url地址            string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri);            //构造http请求的对象            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);            //转成网络流            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data);            //设置            myRequest.Method = type;            myRequest.ContentLength = buf.Length;            myRequest.ContentType = "application/json";            myRequest.MaximumAutomaticRedirections = 1;            myRequest.AllowAutoRedirect = true;            // 发送请求            Stream newStream = myRequest.GetRequestStream();            newStream.Write(buf, 0, buf.Length);            newStream.Close();            // 获得接口返回值            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);            string ReturnXml = reader.ReadToEnd();            reader.Close();            myResponse.Close();            return ReturnXml;        }        #endregion        #region GET方式实现        public string Get(string uri)        {            //Web访问对象64            string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri);                       //构造一个Web请求的对象            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);            // 获得接口返回值68            //获取web请求的响应的内容            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();                        //通过响应流构造一个StreamReader            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);            //string ReturnXml = HttpUtility.UrlDecode(reader.ReadToEnd());            string ReturnXml = reader.ReadToEnd();            reader.Close();            myResponse.Close();            return ReturnXml;        }        #endregion    }}

调用方式

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace WebAPIClientDemo{    class Program    {        static void Main(string[] args)        {            RestClient client = new RestClient("http://localhost:50168");            #region Get 方式请求列表            string str = client.Get("api/values");            Console.WriteLine(str);             #endregion            #region Get 方式请求id对应的数据            string strGetById = client.Get("api/values/2");            Console.WriteLine(strGetById);             #endregion            #region Post 方式 添加数据            string postUri = "api/values/";            string userJson = @"{""Id"":123,""Age"":12,""UserInfo"":""111""}";            string postResponse = client.Post(userJson, postUri);            Console.WriteLine(postResponse);            #endregion            #region Delete             string deleteUri = "api/values/3";             string deleteResponse = client.Delete(deleteUri);            Console.WriteLine(  deleteResponse);            #endregion            #region Put            string putUri = "api/values/123";            string userJson3 = @"{""Id"":123,""Age"":12,""UserInfo"":""111""}";            string putResponse = client.Post(userJson3, putUri);            Console.WriteLine(putResponse);            #endregion            Console.ReadKey();        }    }}