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最近c#项目中遇到图片读取的性能问题，公司的技术总监推荐使用redis来存储。为什么想到用redis来存储:
第一:每张图片不大,都是10-30kb左右一张。
第二:一个项目的图片数量多,一个项目有20-30张图片，并且图片存储在一个专门的图片站点要求要1秒内把图片下载到本地
第三:可以把图片转base64字符串存储到redis中
最开始找的是ServiceStack.Redis，在找资料和技术文档的时候发现是收费的，后面就选用了StackExchange.Redis。
/// <summary> /// Redis操作 /// </summary> public class RedisHelper { private static string connstr = System.Configuration.ConfigurationManager.AppSettings["RedisConnectStr"];// "127.0.0.1:6379,allowadmin=true"; private static ConnectionMultiplexer conn = ConnectionMultiplexer.Connect(connstr); private static IDatabase db = conn.GetDatabase(1); /// <summary> /// 获取系统的redis key前缀 /// </summary> /// <param name="resourceid">资源Id</param> /// <returns></returns> public static string GetMyKey(string resourceid = "") { string Key = "report_"; if (!string.IsNullOrWhiteSpace(resourceid)) { Key = string.Format("report_res_{0}", resourceid); } return Key; } #region String 可以设置过期时间 /// <summary> /// 保存单个key value /// </summary> /// <param name="key">Redis Key</param> /// <param name="value">保存的值</param> /// <param name="expiry">过期时间</param> /// <returns></returns> public static bool SetStringKey(string key, string value, TimeSpan? expiry = default(TimeSpan?)) { return db.StringSet(key, value, expiry); } /// <summary> /// 保存多个key value /// </summary> /// <param name="arr">key</param> /// <returns></returns> public static bool SetStringKey(KeyValuePair<RedisKey, RedisValue>[] arr) { return db.StringSet(arr); } /// <summary> /// 保存一个对象 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key"></param> /// <param name="obj"></param> /// <returns></returns> public static bool SetStringKey<T>(string key, T obj, TimeSpan? expiry = default(TimeSpan?)) { string json = JsonConvert.SerializeObject(obj); return db.StringSet(key, json, expiry); } /// <summary> /// 获取单个key的值 /// </summary> /// <param name="key">Redis Key</param> /// <returns></returns> public static RedisValue GetStringKey(string key) { return db.StringGet(key); } /// <summary> /// 获取多个Key /// </summary> /// <param name="listKey">Redis Key集合</param> /// <returns></returns> public static RedisValue[] GetStringKey(List<RedisKey> listKey) { return db.StringGet(listKey.ToArray()); } /// <summary> /// 获取一个key的对象 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key"></param> /// <returns></returns> public static T GetStringKey<T>(string key) { return JsonConvert.DeserializeObject<T>(db.StringGet(key)); } #endregion #region Hash /// <summary> /// 保存一个集合 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key">Redis Key</param> /// <param name="list">数据集合</param> /// <param name="getModelId"></param> public static void HashSet<T>(string key, List<T> list, Func<T, string> getModelId) { List<HashEntry> listHashEntry = new List<HashEntry>(); foreach (var item in list) { string json = JsonConvert.SerializeObject(item); listHashEntry.Add(new HashEntry(getModelId(item), json)); } db.HashSet(key, listHashEntry.ToArray()); } /// <summary> /// 获取Hash中的单个key的值 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key">Redis Key</param> /// <param name="hasFildValue">RedisValue</param> /// <returns></returns> public static T GetHashKey<T>(string key, string hasFildValue) { if (!string.IsNullOrWhiteSpace(key) && !string.IsNullOrWhiteSpace(hasFildValue)) { RedisValue value = db.HashGet(key, hasFildValue); if (!value.IsNullOrEmpty) { return JsonConvert.DeserializeObject<T>(value); } } return default(T); } /// <summary> /// 获取hash中的多个key的值 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key">Redis Key</param> /// <param name="listhashFields">RedisValue value</param> /// <returns></returns> public static List<T> GetHashKey<T>(string key, List<RedisValue> listhashFields) { List<T> result = new List<T>(); if (!string.IsNullOrWhiteSpace(key) && listhashFields.Count > 0) { RedisValue[] value = db.HashGet(key, listhashFields.ToArray()); foreach (var item in value) { if (!item.IsNullOrEmpty) { result.Add(JsonConvert.DeserializeObject<T>(item)); } } } return result; } /// <summary> /// 获取hashkey所有Redis key /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key"></param> /// <returns></returns> public static List<T> GetHashAll<T>(string key) { List<T> result = new List<T>(); RedisValue[] arr = db.HashKeys(key); foreach (var item in arr) { if (!item.IsNullOrEmpty) { result.Add(JsonConvert.DeserializeObject<T>(item)); } } return result; } /// <summary> /// 获取hashkey所有的值 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="key"></param> /// <returns></returns> public static List<T> HashGetAll<T>(string key) { List<T> result = new List<T>(); HashEntry[] arr = db.HashGetAll(key); foreach (var item in arr) { if (!item.Value.IsNullOrEmpty) { result.Add(JsonConvert.DeserializeObject<T>(item.Value)); } } return result; } /// <summary> /// 删除hasekey /// </summary> /// <param name="key"></param> /// <param name="hashField"></param> /// <returns></returns> public static bool DeleteHase(RedisKey key, RedisValue hashField) { return db.HashDelete(key, hashField); } #endregion #region key /// <summary> /// 删除单个key /// </summary> /// <param name="key">redis key</param> /// <returns>是否删除成功</returns> public static bool KeyDelete(string key) { return db.KeyDelete(key); } /// <summary> /// 删除多个key /// </summary> /// <param name="keys">rediskey</param> /// <returns>成功删除的个数</returns> public static long keyDelete(RedisKey[] keys) { return db.KeyDelete(keys); } /// <summary> /// 判断key是否存储 /// </summary> /// <param name="key">redis key</param> /// <returns></returns> public static bool KeyExists(string key) { return db.KeyExists(key); } /// <summary> /// 重新命名key /// </summary> /// <param name="key">就的redis key</param> /// <param name="newKey">新的redis key</param> /// <returns></returns> public static bool KeyRename(string key, string newKey) { return db.KeyRename(key, newKey); } #endregion /// <summary> /// 追加值 /// </summary> /// <param name="key"></param> /// <param name="value"></param> public static void StringAppend(string key, string value) { ////追加值，返回追加后长度 long appendlong = db.StringAppend(key, value); } }
StackExchange.Redis helper访问类封装
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原文地址：http://www.cnblogs.com/LonelyCode/p/5613608.html
