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- // Admin.NET 项目的版权、商标、专利和其他相关权利均受相应法律法规的保护。使用本项目应遵守相关法律法规和许可证的要求。
- //
- // 本项目主要遵循 MIT 许可证和 Apache 许可证(版本 2.0)进行分发和使用。许可证位于源代码树根目录中的 LICENSE-MIT 和 LICENSE-APACHE 文件。
- //
- // 不得利用本项目从事危害国家安全、扰乱社会秩序、侵犯他人合法权益等法律法规禁止的活动!任何基于本项目二次开发而产生的一切法律纠纷和责任,我们不承担任何责任!
- namespace Admin.NET.Core;
- /// <summary>
- /// 字典值合规性校验特性
- /// </summary>
- [SuppressSniffer]
- [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true, Inherited = true)]
- public class DictAttribute : ValidationAttribute, ITransient
- {
- /// <summary>
- /// 字典编码
- /// </summary>
- public string DictTypeCode { get; }
- /// <summary>
- /// 是否允许空字符串
- /// </summary>
- public bool AllowEmptyStrings { get; set; } = false;
- /// <summary>
- /// 允许空值,有值才验证,默认 false
- /// </summary>
- public bool AllowNullValue { get; set; } = false;
- /// <summary>
- /// 字典值合规性校验特性
- /// </summary>
- /// <param name="dictTypeCode"></param>
- /// <param name="errorMessage"></param>
- public DictAttribute(string dictTypeCode = "", string errorMessage = "字典值不合法!")
- {
- DictTypeCode = dictTypeCode;
- ErrorMessage = errorMessage;
- }
- /// <summary>
- /// 字典值合规性校验
- /// </summary>
- /// <param name="value"></param>
- /// <param name="validationContext"></param>
- /// <returns></returns>
- protected override ValidationResult IsValid(object? value, ValidationContext validationContext)
- {
- // 判断是否允许空值
- if (AllowNullValue && value == null) return ValidationResult.Success;
- // 获取属性的类型
- var property = validationContext.ObjectType.GetProperty(validationContext.MemberName!);
- if (property == null) return new ValidationResult($"未知属性: {validationContext.MemberName}");
- string importHeaderName = GetImporterHeaderName(property, validationContext.MemberName);
- var propertyType = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType;
- // 先尝试从 ValidationContext 的依赖注入容器中拿服务,拿不到或类型不匹配时,再从全局的 App 容器中获取
- if (validationContext.GetService(typeof(SysDictDataService)) is not SysDictDataService sysDictDataService)
- sysDictDataService = App.GetRequiredService<SysDictDataService>();
- // 获取字典值列表
- var dictDataList = sysDictDataService.GetDataList(DictTypeCode).GetAwaiter().GetResult();
- // 使用 HashSet 来提高查找效率
- var dictHash = new HashSet<string>(dictDataList.Select(u => u.Value));
- // 判断是否为集合类型
- if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(List<>))
- {
- // 如果是空集合并且允许空值,则直接返回成功
- if (value == null && AllowNullValue) return ValidationResult.Success;
- // 处理集合为空的情况
- var collection = value as IEnumerable;
- if (collection == null) return ValidationResult.Success;
- // 获取集合的元素类型
- var elementType = propertyType.GetGenericArguments()[0];
- var underlyingElementType = Nullable.GetUnderlyingType(elementType) ?? elementType;
- // 如果元素类型是枚举,则逐个验证
- if (underlyingElementType.IsEnum)
- {
- foreach (var item in collection)
- {
- if (item == null && AllowNullValue) continue;
- if (!Enum.IsDefined(underlyingElementType, item!))
- return new ValidationResult($"提示:{ErrorMessage}|枚举值【{item}】不是有效的【{underlyingElementType.Name}】枚举类型值!", [importHeaderName]);
- }
- return ValidationResult.Success;
- }
- foreach (var item in collection)
- {
- if (item == null && AllowNullValue) continue;
- var itemString = item?.ToString();
- if (!dictHash.Contains(itemString))
- return new ValidationResult($"提示:{ErrorMessage}|字典【{DictTypeCode}】不包含【{itemString}】!", [importHeaderName]);
- }
- return ValidationResult.Success;
- }
- var valueAsString = value?.ToString();
- // 是否忽略空字符串
- if (AllowEmptyStrings && string.IsNullOrEmpty(valueAsString)) return ValidationResult.Success;
- // 枚举类型验证
- if (propertyType.IsEnum)
- {
- if (!Enum.IsDefined(propertyType, value!)) return new ValidationResult($"提示:{ErrorMessage}|枚举值【{value}】不是有效的【{propertyType.Name}】枚举类型值!", [importHeaderName]);
- return ValidationResult.Success;
- }
- if (!dictHash.Contains(valueAsString))
- return new ValidationResult($"提示:{ErrorMessage}|字典【{DictTypeCode}】不包含【{valueAsString}】!", [importHeaderName]);
- return ValidationResult.Success;
- }
- /// <summary>
- /// 获取本字段上 [ImporterHeader(Name = "xxx")] 里的Name,如果没有则使用defaultName.
- /// 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
- /// </summary>
- private static string GetImporterHeaderName(PropertyInfo property, string defaultName)
- {
- var importerHeader = property.GetCustomAttribute<ImporterHeaderAttribute>();
- string importerHeaderName = importerHeader?.Name ?? defaultName;
- return importerHeaderName;
- }
- }
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