.net 常用方法

   #region 获取mvc 模型绑定的错误

        /// <summary>
        /// 获得某个属性的错误ModelState错误信息
        /// </summary>
        /// <param name="modelState"></param>
        /// <param name="attribute"></param>
        /// <returns></returns>
        public static string GetModeStateErrorByAttribute(ModelStateDictionary modelState, string attribute)
        {
            string errorMessage = string.Empty;
            var allError = modelState[attribute];
            if (allError != null)
            {
                foreach (var item in allError.Errors)
                {
                    errorMessage += item.ErrorMessage;
                }
            }

            return errorMessage;
        }

        /// <summary>
        /// 得到所有属性的错误信息
        /// </summary>
        /// <param name="modelState"></param>
        /// <returns></returns>
        public static string GetModeStateErrorByAttribute(ModelStateDictionary modelState)
        {
            string errorMessage = string.Empty;

            foreach (var item in modelState.Keys)
            {
                errorMessage += GetModeStateErrorByAttribute(modelState, item);
            }
            return errorMessage;
        }

        #endregion 获取mvc 模型绑定的错误

        #region GET POST 数据方法

        private static string PostHttpWebRequest(string data, string url)
        {
            string result = null;
            try
            {
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
                byte[] requestBytes = System.Text.Encoding.UTF8.GetBytes(data);
                req.Method = "POST";
                req.ContentType = "application/x-www-form-urlencoded";
                req.ContentLength = requestBytes.Length;
                Stream requestStream = req.GetRequestStream();
                requestStream.Write(requestBytes, 0, requestBytes.Length);
                requestStream.Close();
                HttpWebResponse res = (HttpWebResponse)req.GetResponse();
                StreamReader sr = new StreamReader(res.GetResponseStream());
                result = sr.ReadToEnd();
                sr.Close();
                res.Close();
            }
            catch (Exception ex)
            {
                throw;
            }
            return result;
        }

        private static string PostWebRequestAndCookie(string postData, string url)
        {
            Encoding encoding = Encoding.GetEncoding("utf-8");
            byte[] bytesToPost = encoding.GetBytes(postData);
            CookieContainer cookieCon = new CookieContainer();
            cookieCon.Add(new Cookie { Name = "zhud", Value = "true", Domain = "tiny1.yaolan.com" });
            HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(url);
            httpRequest.CookieContainer = cookieCon;
            httpRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
            httpRequest.ContentType = "application/x-www-form-urlencoded";
            httpRequest.Method = "POST";
            httpRequest.ContentLength = bytesToPost.Length;
            Stream requestStream = httpRequest.GetRequestStream();
            requestStream.Write(bytesToPost, 0, bytesToPost.Length);
            requestStream.Close();
            Stream responseStream = httpRequest.GetResponse().GetResponseStream();
            string stringResponse = string.Empty;
            StreamReader responseReader = new StreamReader(responseStream, Encoding.UTF8);
            stringResponse = responseReader.ReadToEnd();
            responseStream.Close();
            return stringResponse;
        }

        public static string PostWebRequest(string data, string url)
        {
            string result = null;
            try
            {
                WebRequest request = WebRequest.Create(url);
                request.Method = "POST";
                byte[] byteArray = Encoding.UTF8.GetBytes(data);
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = byteArray.Length;
                Stream dataStream = request.GetRequestStream();
                dataStream.Write(byteArray, 0, byteArray.Length);
                dataStream.Close();
                WebResponse response = request.GetResponse();
                dataStream = response.GetResponseStream();
                StreamReader reader = new StreamReader(dataStream);
                result = reader.ReadToEnd();
                reader.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw;
            }
            return result;
        }

        public static string GetWebRequest(string url)
        {
            string result = null;
            try
            {
                WebRequest webRequest = WebRequest.Create(url);
                //  webRequest.Headers.Add("Cookie", Request.Headers["Cookie"]);
                WebResponse webResponse = webRequest.GetResponse();
                Stream stream = webResponse.GetResponseStream();
                StreamReader sr = new StreamReader(stream, Encoding.GetEncoding("UTF-8"));
                result = sr.ReadToEnd();
                webResponse.Close();
                stream.Close();
            }
            catch (Exception ex)
            {
                throw;
            }
            return result;
        }

        public static string PostWebClient(NameValueCollection data, string url)
        {
            string result = null;
            try
            {
                System.Net.WebClient webClient = new System.Net.WebClient();
                byte[] byRemoteInfo = webClient.UploadValues(url, "POST", data);
                result = System.Text.Encoding.UTF8.GetString(byRemoteInfo);
            }
            catch (Exception ex)
            {
                throw;
            }

            return result;
        }

        public static string GetWebClint(string url)
        {
            string result = null;
            try
            {
                System.Net.WebClient webClient = new System.Net.WebClient();
                result = webClient.DownloadString(url);
            }
            catch (Exception ex)
            {
                throw;
            }
            return result;
        }

        #endregion GET POST 数据方法

        public static string UserHostAddress
        {
            get
            {
                return HttpContext.Current.Request.UserHostAddress;
            }
        }

        /// <summary>
        /// ip是否有效
        /// </summary>
        /// <returns></returns>
        public static bool IPIsValid
        {
            get
            {
                bool ipIsValid = false;
                foreach (var item in IPLimitList)
                {
                    if (HttpContext.Current.Request.UserHostAddress.Contains(item.Replace("*", string.Empty)))
                    {
                        ipIsValid = true;
                        break;
                    }
                }

                return ipIsValid;
            }
        }

        public static DateTime WeekStartTime
        {
            get
            {
                DateTime dt = DateTime.Now;
                int dayOfWeek = -1 * (int)dt.DayOfWeek;
                DateTime weekStartTime = dt.AddDays(dayOfWeek + 1);
                if (dayOfWeek == 0)
                {
                    weekStartTime = weekStartTime.AddDays(-7);
                }

                return weekStartTime.Date;
            }
        }

        public static DateTime WeekEndTime
        {
            get
            {
                return WeekStartTime.AddDays(7);
            }
        }

        /// <summary>
        /// xml序列化
        /// </summary>
        /// <param name="type"></param>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string XmlSerializer<T>(T obj)
        {
            System.IO.StringWriter stringWriter = new System.IO.StringWriter();
            try
            {
                System.Xml.Serialization.XmlSerializer xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));
                xmlSerializer.Serialize(stringWriter, obj);
            }
            catch (Exception ex)
            {
                throw;
            }

            return stringWriter.ToString();
        }

        /// <summary>
        /// xml反序列化
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="xml"></param>
        /// <returns></returns>
        public static T XmlDeserialize<T>(string xml)
        {
            System.IO.StringReader stringReader = new System.IO.StringReader(xml);
            System.Xml.Serialization.XmlSerializer xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));
            return (T)xmlSerializer.Deserialize(stringReader);
        }

        public static List<object> GetEnumItems(Type enumType)
        {
            var objList = new List<object>();
            foreach (var item in Enum.GetValues(enumType))
            {
                objList.Add(new { Text=item.ToString(),Value=(int)item});
            }
            return objList;

        }
        /// <summary>
        /// 将对象转化为Json字符串
        /// </summary>
        /// <typeparam name="T">源类型</typeparam>
        /// <param name="obj">源类型实例</param>
        /// <returns>Json字符串</returns>
        public static string ObjToJson<T>(T obj)
        {
            DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(obj.GetType());
            using (MemoryStream ms = new MemoryStream())
            {
                jsonSerializer.WriteObject(ms, obj);
                return Encoding.UTF8.GetString(ms.ToArray());
            }
        }

        /// <summary>
        /// 将Json字符串转化为对象
        /// </summary>
        /// <typeparam name="T">目标类型</typeparam>
        /// <param name="strJson">Json字符串</param>
        /// <returns>目标类型的一个实例</returns>
        public static T JsonToObj<T>(string strJson)
        {
            // T obj = Activator.CreateInstance<T>();
            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson)))
            {
                DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(T));
                return (T)jsonSerializer.ReadObject(ms);
            }
        }

        public static T ChangeType<T>(object value)
        {
            return (T)Convert.ChangeType(value, typeof(T));
        }

        /// <summary>
        /// 将毫秒数(从1970/1/1 到现在所经历的毫秒数)转化为本地时区的时间
        /// </summary>
        /// <param name="ltime"></param>
        /// <returns></returns>
        public static DateTime GetTimeFromInt(long ltime)
        {
            long Eticks = (long)(ltime * 10000) + new DateTime(1970, 1, 1).Ticks;
            DateTime dt = new DateTime(Eticks).ToLocalTime();
            return dt;
        }

        /// <summary>
        ///  将时间变成毫秒数(从1970/1/1 到现在所经历的毫秒数)
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static long GetIntFromTime(DateTime dt)
        {
            DateTime dtNew = DateTime.Now.ToUniversalTime();
            long Sticks = (dtNew.Ticks - new DateTime(1970, 1, 1).Ticks) / 10000;
            return Sticks;
        }

        public static string GetMD5(string input)
        {
            //System.Security.Cryptography.MD5CryptoServiceProvider MD5CSP = new System.Security.Cryptography.MD5CryptoServiceProvider();
            //byte[] inputByte = System.Text.Encoding.Unicode.GetBytes(input);
            //byte[] md5Byte = MD5CSP.ComputeHash(inputByte);
            //md5Result = System.Text.Encoding.Unicode.GetString(md5Byte);

            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(input, "SHA1").ToLower();
        }

.net 常用方法