Uso ServiceStack.Redis (compilación de las últimas fuentes:https: //github.com/ServiceStack/ServiceStack.Redis/tree/master/sr).

Hago algo como esto:

CacheRecord foundKey = cacheRecords.GetById(p_sParentKey);
...
CacheRecord cacheRecord = cacheRecords.Store(foundKey);
...
redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);

intenté depurar usandoConsole.WriteLine(cacheRecords.GetTimeToLive(p_sParentKey)); que devuelve-00:00:01. no importa qué valor asigno a validityPeriodInMinutes.

Traté tambiénExpire, ExpireAt, ExpireEntryAt, ExpireEntryIn. También probé algo como esto:

int epoch = (int)(DateTime.UtcNow.AddSeconds(validityPeriodInMinutes) - new DateTime(1970, 1, 1)).TotalSeconds;
redisClient.ExpireAt(p_sParentKey, epoch);

¿alguna idea

[Serializable]
public class CacheRecord
{
    public CacheRecord()
    {
        this.Children = new List<CacheRecordChild>();
    }

    public string Id { get; set; }
    public List<CacheRecordChild> Children { get; set; }
}
#endregion

#region public class CacheRecordChild
[Serializable]
public class CacheRecordChild
{
    public string Id { get; set; }
    public string Data { get; set; }
}

public void AddKey(string p_sParentKey, string p_sChildKey, string p_sData, int validityPeriodInMinutes)
    {
        using (ServiceStack.Redis.RedisClient redisClient = new ServiceStack.Redis.RedisClient())
        {
            using (var cacheRecords = redisClient.GetTypedClient<CacheRecord>())
            {
                CacheRecord foundKey = cacheRecords.GetById(p_sParentKey);
                if (foundKey == null)
                {
                    foundKey = new CacheRecord();
                    foundKey.Id = p_sParentKey;
                    CacheRecordChild child = new CacheRecordChild();
                    child.Id = p_sChildKey;
                    child.Data = p_sData;
                    foundKey.Children.Add(child);                        
                    CacheRecord cacheRecord = cacheRecords.Store(foundKey);
                    //redisClient.Expire(p_sParentKey, validityPeriodInMinutes);
                    redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);                       
                }
                else
                {
                    CacheRecordChild child = new CacheRecordChild();
                    child.Id = p_sChildKey;
                    child.Data = p_sData;
                    foundKey.Children.Add(child);
                    CacheRecord cacheRecord = cacheRecords.Store(foundKey);
                    // redisClient.Expire(p_sParentKey, validityPeriodInMinutes);
                    // redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
                    // int epoch = (int)(DateTime.UtcNow.AddSeconds(validityPeriodInMinutes) - new DateTime(1970, 1, 1)).TotalSeconds;
                    redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
                }
            }
        }
    }