类型自行判定转化函数

原文链接：http://www.cnblogs.com/CielWater/p/4930484.html

　　　　 /// <summary>
        /// 转换类型
/// </summary>
        /// <param name="type"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static object ConvertValue(Type type, object value)
        {
            if (Convert.IsDBNull(value) || (value == null))
            {
                return null;
            }
            if (type.IsValueType && !type.IsEnum && !type.IsPrimitive && !type.IsSerializable)
            {
                string data = value.ToString();
                return SerializationManager.Deserialize(type, data);
            }
            Type type2 = value.GetType();
            if (type == type2)
            {
                return value;
            }
            if (((type == typeof(Guid)) || (type == typeof(Guid?))) && (type2 == typeof(string)))
            {
                if (string.IsNullOrEmpty(value.ToString()))
                {
                    return null;
                }
                return new Guid(value.ToString());
            }
            if (((type == typeof(DateTime)) || (type == typeof(DateTime?))) && (type2 == typeof(string)))
            {
                if (string.IsNullOrEmpty(value.ToString()))
                {
                    return null;
                }
                return Convert.ToDateTime(value);
            }
            if (type.IsEnum)
            {
                try
                {
                    return Enum.Parse(type, value.ToString(), true);
                }
                catch
                {
                    return Enum.ToObject(type, value);
                }
            }
            if (((type == typeof(bool)) || (type == typeof(bool?))))
            {
                bool tempbool = false;
                if (bool.TryParse(value.ToString(), out tempbool))
                {
                    return tempbool;
                }
                else
                {
                    //处理  Request.Form  的 checkbox  如果没有返回值就是没有选中false  
                    if (string.IsNullOrEmpty(value.ToString()))
                        return false;
                    else
                    {
                        if (value.ToString() == "0")
                        {
                            return false;
                        }
                        return true;
                    }
                }

            }

            if (type.IsGenericType)
            {
                type = type.GetGenericArguments()[0];
            }

            return Convert.ChangeType(value, type);
        }

        /// <summary>
        /// 转换数据类型
        /// </summary>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="value"></param>
        /// <returns></returns>
        public static TResult ConvertValue<TResult>(object value)
        {
            if (Convert.IsDBNull(value) || value == null)
                return default(TResult);

            object obj = ConvertValue(typeof(TResult), value);
            if (obj == null)
            {
                return default(TResult);
            }
            return (TResult)obj;
        }

 

转载于:https://www.cnblogs.com/CielWater/p/4930484.html

标签：return,函数,value,自行,判定,typeof,ToString,null,type
来源： https://blog.csdn.net/weixin_30871701/article/details/97130149