使用特性将数据库返回的datatable转换成对象列表

    public class ColumnMapAttribute : Attribute
    {
        private readonly string _name;
        public ColumnMapAttribute(string name)
        {
            _name = name;
        }
        public string Name { get { return _name; } }
    }

    public class DbModelBase
    {
        public DbModelBase()
        {
        }

        public DbModelBase(DataRow row)
        {
            foreach (var tuple in GetType().GetProperties().Select(p =>
            {
                object[] objs = p.GetCustomAttributes(typeof(ColumnMapAttribute), false);
                return new Tuple<PropertyInfo, string>(p, objs.Length > 0 ? ((ColumnMapAttribute)objs[0]).Name : null);
            }).Where(t => t.Item2 != null))
            {
                object value = row[tuple.Item2];
                if (value != DBNull.Value)
                {
                    Type type = tuple.Item1.PropertyType;
                    if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
                    {
                        //DateTime? -> DateTime
                        type = type.GetGenericArguments()[0];
                    }
                    object changedValue = Convert.ChangeType(value, type);
                    tuple.Item1.SetValue(this, changedValue, null);
                }
            }
        }
    }
    public class ColumnMapAttribute : Attri