值数据类型-可空类型 转换

        /// <summary>
        /// 值数据类型-可空类型 转换
        /// </summary>
        /// <returns></returns>
        private Type ToStruct(Type type)
        {
            try
            {
            //是否实现Nullable
                if (type.IsGenericType && type.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
                    return new NullableConverter(type).UnderlyingType;
                else
                    return type;
            }
            catch(Exception e)
            {
                LocalLogWriter.Write();
                return typeof(object);
            }
        }