redis保存dataset
公司统一走redis缓存，也将之前的memcache迁移到redis
碰到问题是redis的dataset缓存。
memcache底层封装了dataset的序列化。
而redis引的DLL包，未支持。所以封装一个类，提供dataset的set,get功能。
dataset以转为byte[]保存，读取byte[] 转为dataset
代码如下
1 /// <summary> 2 /// 获取缓存（从2进制流） 3 /// </summary> 4 /// <param name="key">缓存键</param> 5 /// <returns></returns> 6 public static object Get(string key) 7 { 8 byte[] buffer = _redisClient.Get(key); 9 return GetObjFromBytes(buffer); 10 } 11 12 /// <summary> 13 /// 从二进制流得到对象（dataset专用，dataset要序列化为二进制才可保存） 14 /// </summary> 15 /// <param name="buffer"></param> 16 /// <returns></returns> 17 private static object GetObjFromBytes(byte[] buffer) { 18 using (System.IO.MemoryStream stream = new System.IO.MemoryStream(buffer)) 19 { 20 stream.Position = 0; 21 System.Runtime.Serialization.IFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); 22 Object reobj = bf.Deserialize(stream); 23 return reobj; 24 } 25 } 26 27 /// <summary> 28 /// 获取DATASET缓存 29 /// </summary> 30 /// <param name="key">缓存键</param> 31 /// <returns></returns> 32 public static DataSet GetMemByDataSet(string key) 33 { 34 var item = Get(key); 35 return (DataSet)item; 36 } 37 /// <summary> 38 /// 获取DATASET缓存（如果没有，则调用Func<T>方法返回对象并加入到缓存） 39 /// </summary> 40 /// <param name="key">缓存键</param> 41 /// <param name="func">委托方法，返回指定对象类型，用于缓存不存在时回调该方法获取数据并插入到缓存</param> 42 /// <param name="minute">过期时间（分钟）</param> 43 /// <returns></returns> 44 public static DataSet GetMemByDataSet(string key, Func<DataSet> func, int minute) 45 { 46 DataSet item = GetMemByDataSet(key); 47 if (item == null) 48 { 49 item = func(); 50 if (item != null) 51 { 52 SetMemByDataSet(key, item, minute); 53 } 54 } 55 return item; 56 } 57 /// <summary> 58 /// 插入DATASET缓存 59 /// </summary> 60 /// <param name="key">缓存键</param> 61 /// <param name="item">缓存对象</param> 62 /// <param name="minute">过期时间（分钟）</param> 63 public static void SetMemByDataSet(string key, DataSet ds, int minute) 64 { 65 DateTime expiryTime = DateTime.Now.AddMinutes(minute); 66 System.Runtime.Serialization.IFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();//定义BinaryFormatter以序列化DataSet对象 67 System.IO.MemoryStream ms = new System.IO.MemoryStream();//创建内存流对象 68 formatter.Serialize(ms, ds);//把DataSet对象序列化到内存流 69 byte[] buffer = ms.ToArray();//把内存流对象写入字节数组 70 ms.Close();//关闭内存流对象 71 ms.Dispose();//释放资源 72 _redisClient.Set(key, buffer, expiryTime); 73 } 74 75 /// <summary> 76 /// 插入dictionary dataset缓存。 77 /// </summary> 78 /// <param name="key">redis保存键</param> 79 /// <param name="dicdss">Dictionary string 键 dataset 值 </param> 80 /// <param name="minute">缓存时间</param> 81 public static void SetDicDataSets(string key, Dictionary<string, DataSet> dicdss, int minute) 82 { 83 //dataset转为二进制流 84 Dictionary<string, byte[]> ndic = new Dictionary<string, byte[]>(); 85 DateTime expiryTime = DateTime.Now.AddMinutes(minute); 86 System.Runtime.Serialization.IFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();//定义BinaryFormatter以序列化DataSet对象 87 System.IO.MemoryStream ms = new System.IO.MemoryStream();//创建内存流对象 88 foreach (var dsentry in dicdss) 89 { 90 formatter.Serialize(ms, dsentry.Value);//把DataSet对象序列化到内存流 91 byte[] buffer = ms.ToArray();//把内存流对象写入字节数组 92 ndic.Add(dsentry.Key, buffer); 93 //清空流 94 ms.SetLength(0); ms.Position = 0; 95 } 96 ms.Close();//关闭内存流对象 97 ms.Dispose();//释放资源 98 _redisClient.Set(key, ndic, expiryTime); 99 } 100 101 /// <summary> 102 /// 插入List. dictionary .dataset缓存。 103 /// </summary> 104 /// <param name="key">redis保存键</param> 105 /// <param name="dicdss">Dictionary string 键 dataset 值 </param> 106 /// <param name="minute">缓存时间</param> 107 public static void SetListDicDataSets(string key,List<Dictionary<string, DataSet>> Listdicdss, int minute) 108 { 109 DateTime expiryTime = DateTime.Now.AddMinutes(minute); 110 System.Runtime.Serialization.IFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();//定义BinaryFormatter以序列化DataSet对象 111 List<Dictionary<string, byte[]>> nlistdic=new List<Dictionary<string,byte[]>>(); 112 System.IO.MemoryStream ms = new System.IO.MemoryStream();//创建内存流对象 113 foreach (var dicdss in Listdicdss) { 114 //dataset转为二进制流 115 Dictionary<string, byte[]> ndic = new Dictionary<string, byte[]>(); 116 foreach (var dsentry in dicdss) 117 { 118 formatter.Serialize(ms, dsentry.Value);//把DataSet对象序列化到内存流 119 byte[] buffer = ms.ToArray();//把内存流对象写入字节数组 120 ndic.Add(dsentry.Key, buffer); 121 //清空流 122 ms.SetLength(0); ms.Position = 0; 123 } 124 nlistdic.Add(ndic); 125 } 126 ms.Close();//关闭内存流对象 127 ms.Dispose();//释放资源 128 _redisClient.Set(key, nlistdic, expiryTime); 129 } 130 /// <summary> 131 /// 得到Dictionary【string, DataSet】 132 /// </summary> 133 /// <param name="key"></param> 134 /// <returns></returns> 135 public static List<Dictionary<string, DataSet>> GetListDicDataSets(string key) 136 { 137 List<Dictionary<string, DataSet>> resutl = new List<Dictionary<string, DataSet>>(); 138 List<Dictionary<string, byte[]>> rebytes = Get<List<Dictionary<string, byte[]>>>(key); 139 foreach (var item in rebytes) { 140 141 Dictionary<string, DataSet> dss = new Dictionary<string, DataSet>(); 142 foreach (var itementry in item) 143 { 144 DataSet ds = (DataSet)GetObjFromBytes(itementry.Value); 145 dss.Add(itementry.Key, ds); 146 } 147 resutl.Add(dss); 148 } 149 return resutl; 150 }
