简单注入器:条件装饰器中的循环依赖错误

本文关键字：循环 依赖 错误 注入器 条件 简单 | 更新日期: 2023-09-27 18:09:03

在重构时，我试图将很多功能从基础存储库移到一些装饰器上。由于某种原因，我得到了一个循环依赖错误。完整的错误在这里:

配置无效。日志含义创建类型为IValidator<EntityDTO>的实例失败。配置无效。类型EntityReaderExcludeDefaultEntitiesDecorator直接或间接依赖于自身

这是我的IValidator实现(流利验证)

public class EntityValidator : IValidator<EntityDTO>
{
    private readonly Data.IEntityReader _repo;
    public EntityValidator(Data.IEntityReader repo)
    {
        _repo = repo;
        RuleFor(e => e.GroupId).NotEqual(Guid.Empty)
            .WithMessage("The selected group is invalid");
        // more rules
    }
}

这是我的Decorator实现

public class EntityReaderExcludeDefaultEntitiesDecorator : IEntityReader
{
    private readonly IEntityReader _reader;
    public EntityReaderExcludeDefaultEntitiesDecorator(IEntityReader reader)
    {
        _reader = reader;
    }
    public EntityDTO FindById(Guid id)
    {
        var entity = _reader.FindById(id);
        if (entity.Name.Equals(DocumentConstants.DEFAULT_ENTITY_NAME)) return null;
        return entity;
    }
    // more methods
}

这是我对装饰器

的配置
container.RegisterConditional(typeof(IEntityWriter), 
    typeof(Service.Decorators.EntityWriterValidationDecorator),
    context => context.Consumer.ServiceType != typeof(IGroupWriter));
// Do not use the decorator in the Document Writer (We need to find the 'None' entity
container.RegisterConditional(typeof(IEntityReader), 
    typeof(Service.Decorators.EntityReaderExcludeDefaultEntitiesDecorator),
    context => context.Consumer.ServiceType != typeof(IDocumentWriter));
container.RegisterConditional<IEntityWriter, DocumentEntityWriter>(c => !c.Handled);
container.RegisterConditional<IEntityReader, DocumentEntityReader>(c => !c.Handled);

我会给更多的信息，但我不知道为什么会这样。我没有正确设置我的装饰器吗?

我没有包括IValidator注册，因为它是正确的。这个错误似乎是说我们不能实例化IValidator<EntityDTO>的原因是因为EntityReaderExcludeDefaultEntitiesDecorator有一个依赖问题(最终是这种情况)。

如果您还需要什么，请告诉我。

简单注入器:条件装饰器中的循环依赖错误

我通过添加检查来确保我没有将装饰器注入到它本身来修复它。应该这样做吗?

// Do not validate when adding from a group
container.RegisterConditional(typeof(IEntityWriter),
    typeof(Decorators.EntityWriterValidationDecorator),
    context => context.Consumer.ServiceType != typeof(IGroupWriter)
        && context.Consumer.ImplementationType != context.ImplementationType);
// Do not use the decorator in the Document Writer (We need to find the 'None' entity
container.RegisterConditional(typeof(IEntityReader),
    typeof(Service.Decorators.EntityReaderExcludeDefaultEntitiesDecorator),
    context => context.Consumer.ServiceType != typeof(IDocumentWriter)
        && context.Consumer.ImplementationType != context.ImplementationType);
相关文章：