asp.net实现图片在线上传并在线裁剪

using My.Log;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.Serialization.Formatters.Binary;
using Newtonsoft.Json;


namespace My.Redis
{ 
    /// 

    ///  
    /// 
    public static class RedisHelper
    {
        private static readonly string Coonstr = ConfigurationManager.ConnectionStrings["RedisExchangeHosts"].ConnectionString;
        
        private static object _locker = new Object();
        private static ConnectionMultiplexer _instance = null;

        /// 

        /// 返回已连接的实例， 
        /// 
        public static ConnectionMultiplexer Instance
        {
            get
            {
                if (_instance == null)
                {
                    lock (_locker)
                    {
                        if (_instance == null || !_instance.IsConnected)
                        {
                            _instance = ConnectionMultiplexer.Connect(Coonstr);
                        }
                    }
                }
                //注册如下事件
                _instance.ConnectionFailed += MuxerConnectionFailed;
                _instance.ConnectionRestored += MuxerConnectionRestored;
                _instance.ErrorMessage += MuxerErrorMessage;
                _instance.ConfigurationChanged += MuxerConfigurationChanged;
                _instance.HashSlotMoved += MuxerHashSlotMoved;
                _instance.InternalError += MuxerInternalError; 
                return _instance;
            }
        }
        static RedisHelper()
        {
        }

        /// 

        /// 获取一个连接实例
        /// 
        /// 
        public static IDatabase GetDatabase()
        {
            return Instance.GetDatabase();
        }

        /// 

        /// 过期时间
        /// 
        /// 分钟
        /// 
        private static TimeSpan ExpireTimeSpan(double Min)
        {
            bool bl = bool.Parse(ConfigurationManager.AppSettings["UseRedis"]);

            if (bl)
            {
                return TimeSpan.FromMinutes(Min);
            }
            else
            {
                return TimeSpan.FromMilliseconds(1);
            }
        }

        

        /// 

        /// 清除 包含特定字符的所有缓存
        /// 
        public static void RemoveSpeStr(string keyStr)
        {
            List<string> listKeys = GetAllKeys();
            foreach (string k in listKeys)
            {
                if (k.Contains(keyStr))
                {
                    Remove(k);
                }
            }
        }


        /// 

        /// 判断在缓存中是否存在该key的缓存数据
        /// 
        /// 
        /// 
        public static bool Exists(string key)
        { 
            return GetDatabase().KeyExists(key);  //可直接调用
        }
         
         
        /// 

        /// 移除指定key的缓存
        /// 
        /// 
        /// 
        public static bool Remove(string key)
        {
            if (Exists(key))
            {
                return GetDatabase().KeyDelete(key);
            }
            return false;
        }

        /// 

        ///  Set
        /// 
        /// 类型
        /// 键
        /// 值
        /// 多少分钟后过期
        /// 
        public static bool Set(string key, T t, double minOut = 60*3)
        { 
            return GetDatabase().StringSet(key, Serialize(t), ExpireTimeSpan(minOut));
        }
         
        /// 

        /// Get
        /// 
        /// 
        /// 
        /// 
        public static T Get(string key)
        { 
            return Deserialize(GetDatabase().StringGet(key));
        }
         
        /// 

        /// DataSet 缓存
        ///  
        public static bool SetData(string key, DataSet ds, double minOut = 60*3)
        {  
            return GetDatabase().StringSet(key, Serialize(ds), ExpireTimeSpan(minOut));
        }
         
        /// 

        /// 获取 DataSet 
        ///  
        public static DataSet GetDataSet(string key)
        { 
            return Deserialize(GetDatabase().StringGet(key)); 
        }

        /// 

        /// 刷新缓存
        /// 
        public static void FlushAll()
        {
            var endpoints = Instance.GetEndPoints();
            var server = Instance.GetServer(endpoints.First());

            server.FlushDatabase(); // to wipe a single database, 0 by default
            //server.FlushAllDatabases(); // to wipe all databases
        }


        /// 

        /// 得到所有缓存键值
        /// 
        /// 
        public static List<string> GetAllKeys()
        {
            List<string> lstKey = new List<string>();
            var endpoints = Instance.GetEndPoints();
            var server = Instance.GetServer(endpoints.First()); 
            var keys = server.Keys();
            foreach (var key in keys)
            {
                lstKey.Add(key);
            }
            return lstKey;
        }

        //----------------------------------------------------------------------------------------------------------
        static string JsonSerialize(object o)
        {
            if (o == null)
            {
                return null;
            } 
            return JsonConvert.SerializeObject(o);
        }

        static T JsonDeserialize(string json)
        {
            if (json == null)
            {
                return default(T);
            }
            return JsonConvert.DeserializeObject(json);
        }

         
        /// 

        /// 序列化对象
        /// 
        /// 
        /// 
        static byte[] Serialize(object o)
        {
            if (o == null)
            {
                return null;
            }
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            using (MemoryStream memoryStream = new MemoryStream())
            {
                binaryFormatter.Serialize(memoryStream, o);
                byte[] objectDataAsStream = memoryStream.ToArray();
                return objectDataAsStream; 
            }
        }

        /// 

        /// 反序列化对象
        /// 
        /// 
        /// 
        /// 
        static T Deserialize(byte[] stream)
        {
            if (stream == null)
            {
                return default(T);
            }
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            using (MemoryStream memoryStream = new MemoryStream(stream))
            {
                T result = (T)binaryFormatter.Deserialize(memoryStream);
                return result;
            }
        }

        /// 

        /// 配置更改时
        /// 
        /// 
        /// 
        private static void MuxerConfigurationChanged(object sender, EndPointEventArgs e)
        {
            LogHelper.LogExceRun("Configuration changed: " + e.EndPoint, new Exception());
        }

        /// 

        /// 发生错误时
        /// 
        /// 
        /// 
        private static void MuxerErrorMessage(object sender, RedisErrorEventArgs e)
        { 
            LogHelper.LogExceRun("ErrorMessage: " + e.Message, new Exception());
        }

        /// 

        /// 重新建立连接之前的错误
        /// 
        /// 
        /// 
        private static void MuxerConnectionRestored(object sender, ConnectionFailedEventArgs e)
        { 
            LogHelper.LogExceRun("ConnectionRestored: " + e.EndPoint, new Exception());
        }

        /// 

        /// 连接失败 ， 如果重新连接成功你将不会收到这个通知
        /// 
        /// 
        /// 
        private static void MuxerConnectionFailed(object sender, ConnectionFailedEventArgs e)
        {
            LogHelper.LogExceRun("重新连接：Endpoint failed: " + e.EndPoint + ", " + e.FailureType + (e.Exception == null ? "" : (", " + e.Exception.Message)), new Exception()); 
        }

        /// 

        /// 更改集群
        /// 
        /// 
        /// 
        private static void MuxerHashSlotMoved(object sender, HashSlotMovedEventArgs e)
        { 
            LogHelper.LogExceRun("HashSlotMoved:NewEndPoint" + e.NewEndPoint + ", OldEndPoint" + e.OldEndPoint, new Exception()); 
        }

        /// 

        /// redis类库错误
        /// 
        /// 
        /// 
        private static void MuxerInternalError(object sender, InternalErrorEventArgs e)
        {
            LogHelper.LogExceRun("InternalError:Message" + e.Exception.Message, new Exception()); 
        }
         
        /// 

        /// GetServer方法会接收一个EndPoint类或者一个唯一标识一台服务器的键值对
        /// 有时候需要为单个服务器指定特定的命令
        /// 使用IServer可以使用所有的shell命令，比如：
        /// DateTime lastSave = server.LastSave();
        /// ClientInfo[] clients = server.ClientList();
        /// 如果报错在连接字符串后加 ,allowAdmin=true;
        /// 
        /// 
        public static IServer GetServer(string host, int port)
        {
            IServer server = Instance.GetServer(host, port);
            return server;
        }

        /// 

        /// 获取全部终结点
        /// 
        /// 
        public static EndPoint[] GetEndPoints()
        {
            EndPoint[] endpoints = Instance.GetEndPoints();
            return endpoints;
        }

    }
}