UNIVPLMDataIntegration/Admin.NET/Admin.NET.Core/Attribute/DictAttribute.cs

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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($"未知属性: {validationContext.MemberName}");
string importHeaderName = GetImporterHeaderName(property, validationContext.MemberName);
var propertyType = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType;
// 先尝试从 ValidationContext 的依赖注入容器中拿服务,拿不到或类型不匹配时,再从全局的 App 容器中获取
if (validationContext.GetService(typeof(SysDictDataService)) is not SysDictDataService sysDictDataService)
sysDictDataService = App.GetRequiredService<SysDictDataService>();
// 获取字典值列表
var dictDataList = sysDictDataService.GetDataList(DictTypeCode).GetAwaiter().GetResult();
// 使用 HashSet 来提高查找效率
var dictHash = new HashSet<string>(dictDataList.Select(u => u.Value));
// 判断是否为集合类型
if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(List<>))
{
// 如果是空集合并且允许空值,则直接返回成功
if (value == null && AllowNullValue) return ValidationResult.Success;
// 处理集合为空的情况
if (value is not IEnumerable collection) return ValidationResult.Success;
// 获取集合的元素类型
var elementType = propertyType.GetGenericArguments()[0];
var underlyingElementType = Nullable.GetUnderlyingType(elementType) ?? elementType;
// 如果元素类型是枚举,则逐个验证
if (underlyingElementType.IsEnum)
{
foreach (var item in collection)
{
if (item == null && AllowNullValue) continue;
if (!Enum.IsDefined(underlyingElementType, item!))
return new ValidationResult($"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;
}
}