.Net Core API常用自定义模型验证特性

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

namespace _SCscHero.Model.01CustomAttribute
{
    /// <summary>
    /// 指定长度的字符串
    /// </summary>
    public class AgreedLengthAttribute : ValidationAttribute
    {
        private int _length;
        /// <summary>
        /// 长度
        /// </summary>
        /// <param name="length"></param>
        public AgreedLengthAttribute(int length)
        {
            _length = length;
        }

        /// <summary>
        /// 验证
        /// </summary>
        /// <param name="value">当前属性值</param>
        /// <param name="validationContext">上下文</param>
        /// <returns></returns>
        protected override ValidationResult IsValid(
    object value, ValidationContext validationContext)
        {
            if (value.ToString().Length == _length)
                return ValidationResult.Success;
            else
                return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
        }

        /// <summary>
        /// 错误提示
        /// </summary>
        /// <returns></returns>
        public string GetErrorMessage(string element) =>
            $"该传入参数{element}非法！";
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

namespace _SCscHero.Model.01CustomAttribute
{
    /// <summary>
    /// 身份证号验证
    /// </summary>
    public class IdentityCardAttribute : ValidationAttribute
    {
        /// <summary>
        /// 验证
        /// </summary>
        /// <param name="value">当前属性值</param>
        /// <param name="validationContext">上下文</param>
        /// <returns></returns>
        protected override ValidationResult IsValid(
    object value, ValidationContext validationContext)
        {
            try
            {
                if (value.ToString().Length != 18)
                {
                    return new ValidationResult("身份证号长度非18位！");
                }

                long n = 0;
                if (long.TryParse(value.ToString().Remove(17), out n) == false
                    || n < Math.Pow(10, 16) || long.TryParse(value.ToString().Replace('x', '0').Replace('X', '0'), out n) == false)
                {
                    return new ValidationResult("身份证号长度非数字！");
                }
                string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
                if (address.IndexOf(value.ToString().Remove(2)) == -1)
                {
                    return new ValidationResult("身份证号中头信息有误！（省份、区号）");
                }
                string birth = value.ToString().Substring(6, 8).Insert(6, "-").Insert(4, "-");
                DateTime time = new DateTime();
                if (DateTime.TryParse(birth, out time) == false)
                {
                    return new ValidationResult("身份证号中生日信息有误！");
                }
                string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
                string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
                char[] Ai = value.ToString().Remove(17).ToCharArray();
                int sum = 0;
                for (int i = 0; i < 17; i++)
                {
                    sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
                }
                int y = -1;
                Math.DivRem(sum, 11, out y);
                if (arrVarifyCode[y] != value.ToString().Substring(17, 1).ToLower())
                {
                    return new ValidationResult("身份证号中校验码信息有误！");
                }
                return ValidationResult.Success;
            }
            catch (Exception ex)
            {
                return new ValidationResult("身份证号非法，校验失败！");
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace _SCscHero.Model.01CustomAttribute
{
    /// <summary>
    /// List集合验证特性
    /// </summary>
    public class ListAttribute : ValidationAttribute
    {
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="isNull">是否为空</param>
        /// <param name="minCount">最小数量</param>
        public ListAttribute(bool isNull = false, int minCount = 1)
        {
            IsNull = isNull;
            MinCount = minCount;
        }

        /// <summary>
        /// 是否为空
        /// </summary>
        public bool IsNull { get; }

        /// <summary>
        /// key集合
        /// </summary>
        public int MinCount { get; }

        /// <summary>
        /// 错误时说明
        /// </summary>
        /// <returns></returns>
        public string GetErrorMessage() =>
            $"当前 list集合等于null 或 小于1个集合.";

        /// <summary>
        /// 验证
        /// </summary>
        /// <param name="value"></param>
        /// <param name="validationContext"></param>
        /// <returns></returns>
        protected override ValidationResult IsValid(object value,
            ValidationContext validationContext)
        {
            var list = value as List<string>;
            if (!IsNull && list == null)
            {
                return new ValidationResult("当前集合不可为空");
            }
            else if (list.Count < MinCount)
            {
                return new ValidationResult("当前集合不可小于");
            }

            return ValidationResult.Success;
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace _SCscHero.Model.01CustomAttribute
{
    /// <summary>
    /// 模型验证特性-指定字符
    /// </summary>
    public class AgreedCharAttribute : ValidationAttribute
    {
        private string[] _AgreedArray;
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="AgreedArray"></param>
        public AgreedCharAttribute(string[] AgreedArray)
        {
            _AgreedArray = AgreedArray;
        }

        /// <summary>
        /// 验证逻辑
        /// </summary>
        /// <param name="value">当前属性值</param>
        /// <param name="validationContext">上下文</param>
        /// <returns></returns>
        protected override ValidationResult IsValid(
    object value, ValidationContext validationContext)
        {
        //将value值转成string与字符串数组进行比对
            if (_AgreedArray.Contains(value.ToString()))
                return ValidationResult.Success;
            else
                return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
        }

        /// <summary>
        /// 错误提示
        /// </summary>
        /// <returns></returns>
        public string GetErrorMessage(string element) =>
            $"该传入参数{element}非法！";
    }
}