using System;
using System.Collections.Generic;
using System.Text;

namespace Appointment.Entity.ValidateAttribute
{
    /// <summary>
    /// 字符串最大长度
    /// </summary>
    /// <remarks>
    /// Add:yuangb 2020-12-9
    /// 使用格式：实体属性前加 [StringMaxLength(200, ErrorMessage = "备注说明最大长度200个字符")]
    /// </remarks>
    public class StringMaxLengthAttribute : ValidateAttribute
    {
        private int _MaxLength = 0;

        /// <summary>
        /// 报错提示
        /// </summary>
        public string ErrorMessage { get; set; }

        public StringMaxLengthAttribute(int maxLength)
        {
            _MaxLength = maxLength;
        }

        public override string Validate(object oValue)
        {
            if (oValue != null && oValue.ToString().Length > _MaxLength)
            {
                return ErrorMessage;
            }
            return null;
        }
    }
}