/// <summary>
/// 获取键值对
/// </summary>
internal static object GetValue(string key, bool onlyMemoryCache = false)
{
lock (_dictLocksForReadCache.GetOrAdd(key, key))
{
object memoryCacheValue = MemoryCacheUtil.GetValue(key);
if (memoryCacheValue != null)
{
return(memoryCacheValue);
}
else
{
if (!onlyMemoryCache)
{
CacheData cacheData = FileCacheUtil.GetCacheData(key);
if (cacheData != null)
{
int expirationSeconds = (int)cacheData.updateTime.AddSeconds(cacheData.expirationSeconds).Subtract(DateTime.Now).TotalSeconds; //剩余过期时间
if (cacheData.expirationSeconds == 0)
{
expirationSeconds = 0; //永不过期的情况
}
MemoryCacheUtil.SetValue(key, cacheData.value, expirationSeconds); //登录系统后(非首次登录)，MemoryCache为空，FileCache不为空
return(cacheData.value);
}
}
}
return(null);
}
}
/// <summary>
/// 获取并缓存数据
/// 高并发的情况建议使用此重载函数，防止重复写入内存缓存
/// </summary>
/// <param name="cacheKey">键</param>
/// <param name="func">在此方法中初始化数据</param>
/// <param name="expirationSeconds">缓存过期时间(秒)，0表示永不过期</param>
/// <param name="refreshCache">立即刷新缓存</param>
public static T TryGetValue <T>(string cacheKey, Func <T> func, int expirationSeconds = 0, bool refreshCache = false)
{
lock (_dictLocksForReadCache.GetOrAdd(cacheKey, cacheKey))
{
object cacheValue = MemoryCacheUtil.GetValue(cacheKey);
if (cacheValue != null && !refreshCache)
{
return((T)cacheValue);
}
else
{
T value = func();
MemoryCacheUtil.SetValue(cacheKey, value, expirationSeconds);
return(value);
}
}
}
/// <summary>
/// 获取实体类属性
/// </summary>
private static List <PropertyInfo> GetEntityPropertiesByCache(Type baseType)
{
lock (_lock)
{
List <PropertyInfo> result = null;
string cacheKey = "ModelHelper.Convert.PropertyInfo." + baseType.FullName;
object cacheValue = MemoryCacheUtil.GetValue(cacheKey);
if (cacheValue != null)
{
result = cacheValue as List <PropertyInfo>;
}
else
{
result = GetEntityProperties(baseType);
MemoryCacheUtil.SetValue(cacheKey, result);
}
return(result);
}
}