public class ValuesController : ApiController
  {
    // GET api/<controller>
    publicIEnumerable<string> Get()
    {
      returnnewstring[] { "value1", "value2" };
    }

    // GET api/<controller>/5
    publicstring Get(int id)
    {
      return"value";
    }

    // POST api/<controller>
    publicvoid Post([FromBody]string value)
    {
    }

    // PUT api/<controller>/5
    publicvoid Put(int id, [FromBody]string value)
    {
    }

    // DELETE api/<controller>/5
    publicvoid Delete(int id)
    {
    }
  }

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;

namespace OilDigital.A2_A27.Web
{
  public class RestClient
  {
    public string EndPoint { get; set; }  //请求的url地址 
    public HttpVerb Method { get; set; }  //请求的方法 
    public string ContentType { get; set; } //格式类型：我用的是application/json，text/xml具体使用什么，看需求吧 
    public string PostData { get; set; }  //传送的数据，当然了我使用的是json字符串 

    public RestClient()
    {
      EndPoint = "";
      Method = HttpVerb.GET;
      ContentType = "application/x-www-form-urlencoded";
      PostData = "";
    }
    public RestClient(string endpoint)
    {
      EndPoint = endpoint;
      Method = HttpVerb.GET;
      ContentType = "application/json";
      PostData = "";
    }
    public RestClient(string endpoint, HttpVerb method)
    {
      EndPoint = endpoint;
      Method = method;
      ContentType = "application/json";
      PostData = "";
    }

    public RestClient(string endpoint, HttpVerb method, string postData)
    {
      EndPoint = endpoint;
      Method = method;
      ContentType = "application/json";
      PostData = postData;
    }
    public RestClient(string endpoint, HttpVerb method, string postData, string contentType)
    {
      EndPoint = endpoint;
      Method = method;
      ContentType = contentType;
      PostData = postData;
    }

    public string MakeRequest()
    {
      return MakeRequest("");
    }

    public string MakeRequest(string parameters)
    {

      var request = (HttpWebRequest)WebRequest.Create(EndPoint + parameters);
      request.Method = Method.ToString();
      request.ContentType = ContentType;
      
      if (!string.IsNullOrEmpty(PostData) && Method == HttpVerb.POST)//如果传送的数据不为空，并且方法是post 
      {
        var encoding = new UTF8Encoding();   
        var bytes = Encoding.GetEncoding("iso-8859-1").GetBytes(PostData);//编码方式按自己需求进行更改，我在项目中使用的是UTF-8 
        request.ContentLength = bytes.Length;

        using (var writeStream = request.GetRequestStream())
        {
          writeStream.Write(bytes, 0, bytes.Length);
        }
      }

      if (!string.IsNullOrEmpty(PostData) && Method == HttpVerb.PUT)//如果传送的数据不为空，并且方法是put 
      {
        var encoding = new UTF8Encoding();
        var bytes = Encoding.GetEncoding("iso-8859-1").GetBytes(PostData);//编码方式按自己需求进行更改，我在项目中使用的是UTF-8 
        request.ContentLength = bytes.Length;

        using (var writeStream = request.GetRequestStream())
        {
          writeStream.Write(bytes, 0, bytes.Length);
        }

      }
      using (var response = (HttpWebResponse)request.GetResponse())
      {
        var responseValue = string.Empty;

        if (response.StatusCode != HttpStatusCode.OK)
        {
          var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
          throw new ApplicationException(message);
        }

        // grab the response 
        using (var responseStream = response.GetResponseStream())
        {
          if (responseStream != null)
            using (var reader = new StreamReader(responseStream))
            {
              responseValue = reader.ReadToEnd();
            }
        }

        return responseValue;
      }
    }

  }
  public enum HttpVerb
  {
    GET,      //method 常用的就这几样，当然你也可以添加其他的  get：获取  post：修改  put：写入  delete：删除 
    POST,
    PUT,
    DELETE
  }


}

var client = new RestClient();
string endPoint = @"http:\myRestService.comapi";
var client = new RestClient(endPoint);
var json = client.MakeRequest(); 

var json = client.MakeRequest("?param=0");

var client = new RestClient();
client.EndPoint = @"http:\myRestService.comapi"; ;
client.ContentType = "application/json";
client.Method = HttpVerb.POST;
client.PostData = "{postData: value}";
var json = client.MakeRequest();

/// <summary>
    /// 从接口中获取当前用户所有信息
    /// </summary>
    /// <param name="userId">用户ID</param>
    /// <returns>json对象</returns>
    public string GetCurrentUserInfo()
    {
      string userId = GetCurrentUserId();
      string endPoint = "http://localhost:100/Api/RestService/"+userId;
      var client = new RestClient(endPoint);
      var userInfo = client.MakeRequest();
      return userInfo;
    }

/// <summary>
    /// 从接口中获取用户所有信息
    /// </summary>
    /// <param name="userId">用户ID</param>
    /// <returns></returns>
    public static JObject CacheUser()
    {

      try
      {
        string currentUser = GetCurrentUserId();
        if (HttpRuntime.Cache.Get("user$" + GetCurrentUserId()) == null)
        {
          string endPoint = "http://66.66.66.666:6666/DASBASE/restServices/dataCollectionService/getUserPermissions";
          string postData = "jsonData={"userCode": "kfry","systemId": "1E1A7AC94BFC41D4BEBED8942EB69689"}";
          var client = new RestClient(endPoint, HttpVerb.POST, postData, "application/x-www-form-urlencoded");
          var u = client.MakeRequest();
          JObject userInfo = JObject.Parse(u);
          //插入缓存
          HttpRuntime.Cache.Insert("user$" + currentUser, userInfo, null, System.DateTime.UtcNow.AddMinutes(30), TimeSpan.Zero);
        }
        return (JObject)HttpRuntime.Cache.Get("user$" + GetCurrentUserId());
      }
      catch (Exception ex)
      {

        throw new ApplicationException("获取用户信息出错："+ex.Message);
      }
    }