32 lines
911 B
C#
32 lines
911 B
C#
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using IdentityServer4.Models;
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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 BZPT.DTO
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{
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[AttributeUsage(AttributeTargets.Property)]
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public class MaxByteLengthAttribute : ValidationAttribute
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{
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private readonly Encoding _encoding = Encoding.UTF8;
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private readonly int _maxBytes;
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public MaxByteLengthAttribute(int maxBytes)
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{
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_maxBytes = maxBytes;
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}
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protected override ValidationResult IsValid(object value, ValidationContext context)
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{
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if (value is string str && _encoding.GetByteCount(str) > _maxBytes)
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{
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return new ValidationResult(ErrorMessage ?? $"字节长度超过 {_maxBytes}");
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}
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return ValidationResult.Success;
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}
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}
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}
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