Cashe的使用
2024-10-06 08:21:50
1.CacheHelper
public class CacheHelper
{
public static ObjectCache Cache
{
get
{
return MemoryCache.Default;
}
} public static bool TryGetCache<T>(string key, ref T value)
{
object v = null;
//Type t = typeof(T);
bool hit;
hit = TryGetCacheObject(key, ref v);
if (hit)
value = (T)v;
return hit;
} //public static bool TryGetCache(string key, ref bool value)
//{
// return TryGetCacheStruct(key, ref value);
//} //public static bool TryGetCache(string key, ref int value)
//{
// return TryGetCacheStruct(key, ref value);
//} public static bool TryGetCacheStruct<T>(string key, ref T value) where T : struct
{
object v = null;
bool hit = TryGetCacheObject(key, ref v);
if (hit)
value = (T)v;
return hit;
} public static bool TryGetCacheObject(string key, ref object value)
{
object v = Cache.Get(key);
bool hit = false;
if (v == null)
hit = false;
else if (v == DBNull.Value)
{
hit = true;
value = null;
}
else
{
hit = true;
value = v;
}
//TraceHelper.Trace("Cache", string.Format("TryGetCache({0}) = {1}", key, hit));
return hit;
} public static bool ContainsCache(string key)
{
bool hit = Cache.Contains(key);
//TraceHelper.Trace("Cache", string.Format("ContainsCache({0}) = {1}", key, hit));
return hit;
} public static object GetCache(string key)
{
object v = Cache.Get(key);
if (v == DBNull.Value)
{
return null;
}
//TraceHelper.Trace("Cache", string.Format("GetCache({0}) = {1}", key, v == null ? "null" : v.ToString()));
return v;
} public static void SetCache(string key, object value)
{
SetCache(key, value, CacheItemPolicy);
} public static void SetCache(string key, object value, CacheItemPolicy policy)
{
object v = value;
if (value == null)
v = DBNull.Value;
Cache.Set(key, v, policy);
//TraceHelper.Trace("Cache", string.Format("SetCache({0}) = {1}", key, value == null ? "null" : value.ToString()));
} public static CacheItemPolicy CacheItemPolicy
{
get
{ CacheItemPolicy policy = new CacheItemPolicy();
policy.SlidingExpiration = new TimeSpan(0, AppConfiguration.CacheSlidingExpirationInMins, 0);
return policy;
}
} public static CacheItemPolicy AbsoluteCacheItemPolicy
{
get
{
CacheItemPolicy policy = new CacheItemPolicy();
policy.AbsoluteExpiration = DateTime.Now + TimeSpan.FromMinutes(AppConfiguration.CacheAbsoluteExpirationInMins);
return policy;
}
} public static void ClearCacheByPrefix(string prefix)
{
List<string> keys = new List<string>();
foreach (var c in Cache)
{
if (c.Key.StartsWith(prefix))
{
keys.Add(c.Key);
}
}
int count = keys.Count;
foreach (var key in keys)
{
Cache.Remove(key);
}
//TraceHelper.Trace("Cache", string.Format("ClearCacheByPrefix({0}) = {1}", prefix, count));
}
}
public class TestKey
{
public string Code { get; set; }
public decimal CodeNo { get; set; } public override bool Equals(object obj)
{
TestKey v = obj as TestKey;
if (v == null) return false; return v.Code== this.Code && v.CodeNo== this.CodeNo;
} public override int GetHashCode()
{
int primeNo = 31;
return (this.Code.GetHashCode() * primeNo + this.CodeNo.GetHashCode();
}
}
public static HashSet<StopPaymentKey> GetAllFromCache()
{
string cachekey = "AllTestKeys";
HashSet<TestKey> set = null;
if (!CacheHelper.TryGetCache(cachekey, ref set))
{
set= GetAllTestKeys();
CacheItemPolicy policy = CacheHelper.AbsoluteCacheItemPolicy;
//policy.RemovedCallback = (arg) =>
//{
// var newSet = GetAllTestCodes();
// CacheHelper.SetCache(cachekey, newSet, policy);
//};
CacheHelper.SetCache(cachekey, stoppaymentSet, policy);
}
return set;
}
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