59 lines
1.6 KiB
C#
59 lines
1.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel.DataAnnotations;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace DG.Core
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{
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public class LongValidationAttribute : ValidationAttribute
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{
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public int? Length { get; }
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private bool LengthError { get; set; }
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public LongValidationAttribute()
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{
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}
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public LongValidationAttribute(int? length)
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{
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Length = length;
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}
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/// <summary>
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/// IsValid 为 false 时，提示得 error 信息
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/// </summary>
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/// <param name="name"></param>
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/// <returns></returns>
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public override string FormatErrorMessage(string name)
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{
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var lengthMessage = LengthError ? $"，且长度不能超过{Length}" : "";
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return $"{name}必须输入数字{lengthMessage}，请重新输入！";
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}
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/// <summary>
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/// 验证当前字段得结果
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/// </summary>
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/// <param name="value"></param>
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/// <returns></returns>
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public override bool IsValid(object? value)
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{
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if (value == null) return true;
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if (long.TryParse(Convert.ToString(value), out long num))
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{
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if (Length != null && num.ToString().Length > Length)
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{
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LengthError = true;
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return false;
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}
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return true;
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}
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else
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{
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return false;
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}
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}
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}
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}
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