/// <summary>
/// 创建一个设置缓存值的任务
/// </summary>
/// <typeparam name="T">缓存值类型</typeparam>
/// <param name="cacheKey">缓存键</param>
/// <param name="cacheFactory">创建缓存值和策略的工厂方法</param>
/// <returns>一个创建和设置缓存值的任务</returns>
private async Task <T> SetValue <T>(string cacheKey, Func <Task <CacheEntry <T> > > cacheFactory)
{
await Task.Yield();
var cacheEntry = await cacheFactory();
cacheEntry.Validate();
var policy = cacheEntry.CachePolicyItem;
var value = cacheEntry.Value;
if (policy.CacheState == CacheState.Valid)
{
await _cacheProvider.Set(cacheKey, value, policy);
}
return(value);
}