C# 使用 Autofac 注册部分封闭的泛型类型
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15226536/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Register partically closed generic type with Autofac
提问by shortcode
I have UnitofWorkclass and it implement IUnitOfWork. I try to register that with Autofac:
我有UnitofWork课，它实现了IUnitOfWork. 我尝试用 Autofac 注册它：
var builder = new ContainerBuilder();
builder
.RegisterGeneric(typeof(UnitOfWork<Repository<>,>))
.As(typeof(IUnitOfWork))
.InstancePerDependency();
Implementation is:
实现是：
public class UnitOfWork<T, O> : IUnitOfWork
where T : Repository<O>
where O : BaseEntity
{
}
public interface IUnitOfWork : IDisposable
{
void SaveChanges();
}
Gives an error "Type expected"
给出错误“预期类型”
but this one work on another project:
但是这个在另一个项目上工作：
public class Repository<T> : GenericRepository<T>
where T : BaseEntity
{
public Repository(IDbContext context) : base(context) { }
}
public abstract class GenericRepository<T>
: IRepository<T>, IQueryable<T> where T : BaseEntity
{
}
builder
.RegisterGeneric(typeof(Repository<>))
.As(typeof(IRepository<>))
.InstancePerHttpRequest();
采纳答案by nemesv
You cannot have partially opened classes(e.g. with UnitOfWork<Repository<>,>you have specified Tbut not O) inside a typeof, try it with:
你不能有部分打开类（例如，用UnitOfWork<Repository<>,>您指定T，但没有O）里面typeof，有尝试：
var builder = new ContainerBuilder();
builder
.RegisterGeneric(typeof(UnitOfWork<,>))
.As(typeof(IUnitOfWork))
.InstancePerDependency();
The where T : Repository<O>generic constraint will take care of that the first argument should be an Repository<>
在where T : Repository<O>通用的限制将采取的第一个参数应该是一个照顾Repository<>
But it won't work with RegisterGenericbecause it requires a generic interfaceso need to create a IUnitOfWork<T,O>…
但它不会工作，RegisterGeneric因为它需要一个通用接口，所以需要创建一个IUnitOfWork<T,O>......
But your model is very strange. Why does your UnitOfWorkneed a Repository<>type argument?
但是你的模型很奇怪。为什么UnitOfWork需要Repository<>类型参数？
Instead of having it as a type argument you can get an Repository<>in your UnitOfWork<E>constructor:
您可以Repository<>在UnitOfWork<E>构造函数中获取一个，而不是将其作为类型参数：
public class UnitOfWork<E> : IUnitOfWork<E> where E : BaseEntity
{
private readonly Repository<E> repository;
public UnitOfWork(Repository<E> repository)
{
this.repository = repository;
}
//.. other methods
}
Where IUnitOfWork<E>
在哪里 IUnitOfWork<E>
public interface IUnitOfWork<E> : IDisposable where E : BaseEntity
{
void SaveChanges();
}
And the Autofac registration:
和 Autofac 注册：
var builder = new ContainerBuilder();
builder
.RegisterGeneric(typeof(Repository<>)).AsSelf();
builder
.RegisterGeneric(typeof(UnitOfWork<>))
.As(typeof(IUnitOfWork<>))
.InstancePerDependency();
var container = builder.Build();
// sample usage
var u = container.Resolve<IUnitOfWork<MyEntity>>();
