IT工程師數位筆記本

using EntryRegistration.Filters;
using EntryRegistration.Models.Entity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

namespace EntryRegistration.Models
{
    public class Check
    {
        /// <summary>
        /// 檢查方法，支持泛型
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="instance"></param>
        /// <returns></returns>
        public static CheckResult CheckRequire<T>(T instance)
        {

            //初始化驗證結果
            CheckResult result = new CheckResult()
            {
                isSuccess = true,
                msg = "驗證OK"
            };
            //獲取T類的屬性
            Type t = typeof(T);
            var propertyInfos = t.GetProperties();

            //遍歷屬性
            foreach (var propertyInfo in propertyInfos)
            {
                //檢查屬性是否標記了特性
                RequireAttribute attribute = (RequireAttribute)Attribute.GetCustomAttribute(propertyInfo, typeof(RequireAttribute));

                //沒標記，直接跳過
                if (attribute == null)
                {
                    continue;
                }

                //獲取該屬性的值
                var value = propertyInfo.GetValue(instance);
                //獲取屬性的數據類型
                if (typeof(string) == propertyInfo.PropertyType)
                {
                    if (string.IsNullOrEmpty((string)value) && attribute.IsRequire)
                    {
                        result.isSuccess = false;
                        result.msg = propertyInfo.Name + "不能為空";
                        return result;
                    }

                }
                else if (typeof(int?) == propertyInfo.PropertyType)
                {
                    if (value == null && attribute.IsRequire)
                    {
                        result.isSuccess = false;
                        result.msg = propertyInfo.Name + "不能為空";
                        return result;
                    }
                }
                else if (typeof(Guid) == propertyInfo.PropertyType)
                {
                    if (Guid.Parse(value.ToString()) == Guid.Empty && attribute.IsRequire)
                    {
                        result.isSuccess = false;
                        result.msg = propertyInfo.Name + "不能為空";
                        return result;
                    }
                }
            }

            return result;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace EntryRegistration.Filters
{
    public class RequireAttribute : Attribute
    {

        public bool IsRequire { get; }

        /// <summary>
        /// 構造函數
        /// </summary>
        /// <param name="isRequire"></param>
        public RequireAttribute(bool IsRequire)
        {
            this.IsRequire = IsRequire;
        }
    }
}