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

namespace Appointment.Entity.ValidateAttribute
{
    /// <summary>
    /// 字符串长度校验特性
    /// </summary>
    /// <remarks>
    /// Add:yuangb 2019-3-5
    /// 使用格式：实体属性前加[StringLength(50, MinLength = 2, ErrorMessage = "获取微信用户信息失败")]
    /// </remarks>
    public class StringLengthAttribute : ValidateAttribute
    {
        /// <summary>
        /// 最小长度
        /// </summary>
        public int MinLength { get; set; }

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

        private int _maxLength;

        public StringLengthAttribute(int maxLength)
        {
            this._maxLength = maxLength;
        }

        public override string Validate(object oValue)
        {
            if (oValue == null || string.IsNullOrWhiteSpace(oValue.ToString()) || oValue.ToString().Length > this._maxLength || oValue.ToString().Length < this.MinLength)
            {
                return ErrorMessage;
            }
            else
            {
                return null;
            }
        }
    }
}