public enum HttpMethod { Get, Post }    /// <summary>HttpClient</summary>       public class HttpClient    {        public Encoding encoding { get; set; }        public HttpClient()        {            this.encoding = Encoding.Default;        }        public HttpClient(Encoding encoding)        {            this.encoding = encoding;        }        /// <summary>        /// Get请求        /// </summary>        public HttpResponse get(string url, HttpParameter[] parameters = null, Dictionary<string, string> headers = null)        {            return this.request(url, HttpMethod.Get, parameters, headers);        }        /// <summary>        /// Post请        /// </summary>        public HttpResponse post(string url, HttpParameter[] parameters = null, Dictionary<string, string> headers = null, string postData = http://www.mamicode.com/null)        {            return this.request(url, HttpMethod.Post, parameters, headers, postData);        }        /// <summary>        /// 请求        /// </summary>        public HttpResponse request(string url, HttpMethod method = HttpMethod.Get, HttpParameter[] parameters = null, Dictionary<string, string> headers = null, string postData = http://www.mamicode.com/null, string contentType = null)        {            if (method == HttpMethod.Get && parameters != null)                url += (url.IndexOf("?") == -1 ? "?" : "&") + this.buildStringParameters(parameters);            HttpWebRequest http = WebRequest.Create(url) as HttpWebRequest;            http.ServicePoint.Expect100Continue = false;            http.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)";            if (headers != null)            {                foreach (var key in headers.Keys)                {                    http.Headers[key] = headers[key];                }            }            switch (method)            {                case HttpMethod.Get:                    {                        http.Method = "GET";                        break;                    }                case HttpMethod.Post:                    {                        http.Method = "POST";                        if (!string.IsNullOrEmpty(contentType))                        {                            http.ContentType = contentType;                            using (StreamWriter request = new StreamWriter(http.GetRequestStream()))                            {                                try                                {                                    if (postData =http://www.mamicode.com/= null)                                        request.Write(this.buildStringParameters(parameters));                                    else                                        request.Write(postData);                                }                                finally                                {                                    request.Close();                                }                            }                        }                        else                        {                            if (parameters != null && parameters.Count(p => p.isBinary) > 0)                            {                                string boundary = this.getBoundary();                                http.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);                                http.AllowWriteStreamBuffering = true;                                using (Stream request = http.GetRequestStream())                                {                                    try                                    {                                        var raw = this.buildBinaryParameters(boundary, parameters);                                        request.Write(raw, 0, raw.Length);                                    }                                    finally                                    {                                        request.Close();                                    }                                }                            }                            else                            {                                http.ContentType = "application/x-www-form-urlencoded";                                using (StreamWriter request = new StreamWriter(http.GetRequestStream()))                                {                                    try                                    {                                        if (postData =http://www.mamicode.com/= null)                                            request.Write(this.buildStringParameters(parameters));                                        else                                            request.Write(postData);                                    }                                    finally                                    {                                        request.Close();                                    }                                }                            }                        }                        break;                    }            }            var httpResponse = new HttpResponse();            try            {                using (WebResponse response = http.GetResponse())                {                    using (StreamReader reader = new StreamReader(response.GetResponseStream(), this.encoding))                    {                        httpResponse.content = reader.ReadToEnd().Trim();                        reader.Close();                    }                    response.Close();                }            }            catch (WebException e)            {                httpResponse.status = e.Status;                httpResponse.Message = e.Message;                httpResponse.StackTrace = e.StackTrace;                httpResponse.TotalMessage=e.Status+"======"+ e.Message+"=====" + e.StackTrace;            }            return httpResponse;        }        /// <summary>        /// hash值        /// </summary>        private string getBoundary()        {            string pattern = "abcdefghijklmnopqrstuvwxyz0123456789";            StringBuilder boundaryBuilder = new StringBuilder();            Random rnd = new Random();            for (int i = 0; i < 10; i++)            {                var index = rnd.Next(pattern.Length);                boundaryBuilder.Append(pattern[index]);            }            return boundaryBuilder.ToString();        }        /// <summary>        /// 生成字符参数        /// </summary>        private string buildStringParameters(HttpParameter[] parameters)        {            if (parameters == null) return "";            var s = new StringBuilder("");            bool first = true;            foreach (var item in parameters)            {                if (first) first = false;                else s.Append("&");                var value = http://www.mamicode.com/string.Format("{0}", item.value);                s.Append(Uri.EscapeDataString(item.name)).Append("=").Append(Uri.EscapeDataString(value));            }            return s.ToString();        }        /// <summary>        /// 生成二进制参数        /// </summary>        /// <param name="boundary"></param>        /// <param name="parameters">参数</param>        /// <returns></returns>        private byte[] buildBinaryParameters(string boundary, params HttpParameter[] parameters)        {            List<HttpParameter> pairs = new List<HttpParameter>(parameters);            MemoryStream buff = new MemoryStream();            byte[] headerBuff = Encoding.ASCII.GetBytes(string.Format("\r\n--{0}\r\n", boundary));            byte[] footerBuff = Encoding.ASCII.GetBytes(string.Format("\r\n--{0}--", boundary));            StringBuilder contentBuilder = new StringBuilder();            foreach (HttpParameter p in pairs)            {                if (!p.isBinary)                {                    var value = http://www.mamicode.com/string.Format("{0}", p.value);                    if (string.IsNullOrEmpty(value))                    {                        continue;                    }                    buff.Write(headerBuff, 0, headerBuff.Length);                    byte[] dispositonBuff = Encoding.UTF8.GetBytes(string.Format("content-disposition: form-data; name=\"{0}\"\r\n\r\n{1}", p.name, p.value.ToString()));                    buff.Write(dispositonBuff, 0, dispositonBuff.Length);                }                else                {                    buff.Write(headerBuff, 0, headerBuff.Length);                    string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: \"image/unknow\"\r\nContent-Transfer-Encoding: binary\r\n\r\n";                    byte[] fileBuff = System.Text.Encoding.UTF8.GetBytes(string.Format(headerTemplate, p.name, string.Format("upload{0}", BitConverter.ToInt64(Guid.NewGuid().ToByteArray(), 0))));                    buff.Write(fileBuff, 0, fileBuff.Length);                    byte[] file = (byte[])p.value;                    buff.Write(file, 0, file.Length);                }            }            buff.Write(footerBuff, 0, footerBuff.Length);            buff.Position = 0;            byte[] contentBuff = new byte[buff.Length];            buff.Read(contentBuff, 0, contentBuff.Length);            buff.Close();            buff.Dispose();            return contentBuff;        }    }