/// <summary>
/// 设置缓存过期
/// </summary>
/// <param name="key"></param>
/// <param name="datetime"></param>
public static void SetExpire(string key, DateTime datetime)
{
using (NewLife.Caching.Redis redis = GetClient())
{
TimeSpan ts = datetime - DateTime.Now;
redis.SetExpire(key, ts);
}
}