zhywebcore/learun.core/learun.wechat/Model/Attribute/LengthAttribute.cs

using System;

namespace learun.wechat
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.11.06
	/// 描 述：字段长度属性
	/// </summary>
	[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
	public class LengthAttribute : Attribute, IVerifyAttribute
	{
		private int MinLength { get; set; }

		private int MaxLength { get; set; }

		private string Message { get; set; }

		/// <summary>
		///
		/// </summary>
		/// <param name="minLength"></param>
		/// <param name="maxLength"></param>
		public LengthAttribute(int minLength, int maxLength)
		{
			MinLength = minLength;
			MaxLength = maxLength;
			Message = string.Format("字符串长度应在{0}到{1}之间", minLength, maxLength);
		}

		/// <summary>
		///
		/// </summary>
		/// <param name="minLength"></param>
		/// <param name="maxLength"></param>
		/// <param name="message"></param>
		public LengthAttribute(int minLength, int maxLength, string message)
		{
			MinLength = minLength;
			MaxLength = maxLength;
			Message = string.Format(message, minLength, maxLength);
		}

		/// <summary>
		///
		/// </summary>
		/// <param name="type"></param>
		/// <param name="obj"></param>
		/// <param name="message"></param>
		/// <returns></returns>
		public bool Verify(Type type, object obj, out string message)
		{
			message = "";

			if (type == typeof(string) && obj != null)
			{
				if ((obj as string).Length > MaxLength || (obj as string).Length < MinLength)
				{
					message = Message;
					return false;
				}
			}

			return true;
		}
	}
}