DictAttribute.cs 6.0 KB

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  6. namespace Admin.NET.Core;
  7. /// <summary>
  8. /// 字典值合规性校验特性
  9. /// </summary>
  10. [SuppressSniffer]
  11. [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true, Inherited = true)]
  12. public class DictAttribute : ValidationAttribute, ITransient
  13. {
  14. /// <summary>
  15. /// 字典编码
  16. /// </summary>
  17. public string DictTypeCode { get; }
  18. /// <summary>
  19. /// 是否允许空字符串
  20. /// </summary>
  21. public bool AllowEmptyStrings { get; set; } = false;
  22. /// <summary>
  23. /// 允许空值,有值才验证,默认 false
  24. /// </summary>
  25. public bool AllowNullValue { get; set; } = false;
  26. /// <summary>
  27. /// 字典值合规性校验特性
  28. /// </summary>
  29. /// <param name="dictTypeCode"></param>
  30. /// <param name="errorMessage"></param>
  31. public DictAttribute(string dictTypeCode = "", string errorMessage = "字典值不合法!")
  32. {
  33. DictTypeCode = dictTypeCode;
  34. ErrorMessage = errorMessage;
  35. }
  36. /// <summary>
  37. /// 字典值合规性校验
  38. /// </summary>
  39. /// <param name="value"></param>
  40. /// <param name="validationContext"></param>
  41. /// <returns></returns>
  42. protected override ValidationResult IsValid(object? value, ValidationContext validationContext)
  43. {
  44. // 判断是否允许空值
  45. if (AllowNullValue && value == null) return ValidationResult.Success;
  46. // 获取属性的类型
  47. var property = validationContext.ObjectType.GetProperty(validationContext.MemberName!);
  48. if (property == null) return new ValidationResult($"未知属性: {validationContext.MemberName}");
  49. string importHeaderName = GetImporterHeaderName(property, validationContext.MemberName);
  50. var propertyType = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType;
  51. // 先尝试从 ValidationContext 的依赖注入容器中拿服务,拿不到或类型不匹配时,再从全局的 App 容器中获取
  52. if (validationContext.GetService(typeof(SysDictDataService)) is not SysDictDataService sysDictDataService)
  53. sysDictDataService = App.GetRequiredService<SysDictDataService>();
  54. // 获取字典值列表
  55. var dictDataList = sysDictDataService.GetDataList(DictTypeCode).GetAwaiter().GetResult();
  56. // 使用 HashSet 来提高查找效率
  57. var dictHash = new HashSet<string>(dictDataList.Select(u => u.Value));
  58. // 判断是否为集合类型
  59. if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(List<>))
  60. {
  61. // 如果是空集合并且允许空值,则直接返回成功
  62. if (value == null && AllowNullValue) return ValidationResult.Success;
  63. // 处理集合为空的情况
  64. var collection = value as IEnumerable;
  65. if (collection == null) return ValidationResult.Success;
  66. // 获取集合的元素类型
  67. var elementType = propertyType.GetGenericArguments()[0];
  68. var underlyingElementType = Nullable.GetUnderlyingType(elementType) ?? elementType;
  69. // 如果元素类型是枚举,则逐个验证
  70. if (underlyingElementType.IsEnum)
  71. {
  72. foreach (var item in collection)
  73. {
  74. if (item == null && AllowNullValue) continue;
  75. if (!Enum.IsDefined(underlyingElementType, item!))
  76. return new ValidationResult($"提示:{ErrorMessage}|枚举值【{item}】不是有效的【{underlyingElementType.Name}】枚举类型值!", [importHeaderName]);
  77. }
  78. return ValidationResult.Success;
  79. }
  80. foreach (var item in collection)
  81. {
  82. if (item == null && AllowNullValue) continue;
  83. var itemString = item?.ToString();
  84. if (!dictHash.Contains(itemString))
  85. return new ValidationResult($"提示:{ErrorMessage}|字典【{DictTypeCode}】不包含【{itemString}】!", [importHeaderName]);
  86. }
  87. return ValidationResult.Success;
  88. }
  89. var valueAsString = value?.ToString();
  90. // 是否忽略空字符串
  91. if (AllowEmptyStrings && string.IsNullOrEmpty(valueAsString)) return ValidationResult.Success;
  92. // 枚举类型验证
  93. if (propertyType.IsEnum)
  94. {
  95. if (!Enum.IsDefined(propertyType, value!)) return new ValidationResult($"提示:{ErrorMessage}|枚举值【{value}】不是有效的【{propertyType.Name}】枚举类型值!", [importHeaderName]);
  96. return ValidationResult.Success;
  97. }
  98. if (!dictHash.Contains(valueAsString))
  99. return new ValidationResult($"提示:{ErrorMessage}|字典【{DictTypeCode}】不包含【{valueAsString}】!", [importHeaderName]);
  100. return ValidationResult.Success;
  101. }
  102. /// <summary>
  103. /// 获取本字段上 [ImporterHeader(Name = "xxx")] 里的Name,如果没有则使用defaultName.
  104. /// 用于在从excel导入数据时,能让调用者知道是哪个字段验证失败,而不是抛异常
  105. /// </summary>
  106. private static string GetImporterHeaderName(PropertyInfo property, string defaultName)
  107. {
  108. var importerHeader = property.GetCustomAttribute<ImporterHeaderAttribute>();
  109. string importerHeaderName = importerHeader?.Name ?? defaultName;
  110. return importerHeaderName;
  111. }
  112. }