Redis 将 HashSet 获取到所需的类型而不适用于可空类型

Question

我已经通过以下方法将 class 值插入到 redis 中

 public static bool InsertHashItem(string key, object obj)
        {
            bool result = false;
            try
            {
                if (Muxer != null && Muxer.IsConnected && Muxer.GetDatabase() != null)
                {
                    IDatabase getDatabase = Muxer.GetDatabase();
                    getDatabase.HashSet(key, ToHashEntries(obj));
                    result = true;
                }
            }
            catch (Exception ex)
            {
                Logger.Fatal(ex.Message, ex);
            }
            return result;
        }

我的 class 看起来像

  public class TestType
    {
        public int telcoid { get; set; }
        public int parent_id { get; set; }
        public string checksum { get; set; }
        public string tag_registration_id { get; set; }
        public string market_id { get; set; }
        public double amount { get; set; }
        public string utid { get; set; }
        public int status { get; set; }

        public DateTime? dt { get; set; }

    }

现在得到那个class我写了一个方法，它在可空类型上失败

 public static T GetHashItem<T>(string key) where T : new()
        {
            T obj = default(T);

            try
            {
                if (Muxer != null && Muxer.IsConnected && Muxer.GetDatabase() != null)
                {
                    IDatabase getDatabase = Muxer.GetDatabase();
                    var hashkey = getDatabase.HashKeys(key);
                    if (hashkey != null && hashkey.Count() > 0)
                    {
                        var dic = hashkey.ToDictionary(k => k, k => getDatabase.HashGet(key, k));

                        obj = new T();
                        foreach (var prop in typeof(T).GetProperties())
                        {


                            prop.SetValue(obj, Convert.ChangeType(dic[prop.Name], prop.PropertyType));
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.Fatal(ex.Message, ex);
            }
            return obj;
        }

请指教我需要什么修正

Answer 1

当 属性 类型为 Nullable 时，尝试获取基础类型，如下所示：

Type type = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
prop.SetValue(obj, Convert.ChangeType(dic[prop.Name], type));