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();

                //string encodestr = HttpContext.Current.Server.UrlEncode(PostData);

                //var encodestr = HttpUtility.UrlEncode(PostData);

                var bytes = Encoding.GetEncoding("UTF-8").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, , 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, , 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

    }