获取实现特定开放泛型类型的所有类型 [英] Get all types implementing specific open generic type

问题描述

如何获取实现特定开放泛型类型的所有类型?

How do I get all types that implementing a specific open generic type?

例如:

public interface IUserRepository : IRepository<User>

查找所有实现 IRepository<> 的类型.

Find all types that implement IRepository<>.

public static IEnumerable<Type> GetAllTypesImplementingOpenGenericType(Type openGenericType, Assembly assembly)
{
  ...
}

推荐答案

这将返回所有继承通用基类的类型.并非所有类型都继承了通用接口.

This will return all types that inherit a generic base class. Not all types that inherit a generic interface.

var AllTypesOfIRepository = from x in Assembly.GetAssembly(typeof(AnyTypeInTargetAssembly)).GetTypes()
 let y = x.BaseType
 where !x.IsAbstract && !x.IsInterface &&
 y != null && y.IsGenericType &&
 y.GetGenericTypeDefinition() == typeof(IRepository<>)
 select x;

这将返回所有类型，包括在其继承链中具有开放泛型类型的接口、抽象和具体类型.

This will return all types, including interfaces, abstracts, and concrete types that have the open generic type in its inheritance chain.

public static IEnumerable<Type> GetAllTypesImplementingOpenGenericType(Type openGenericType, Assembly assembly)
{
    return from x in assembly.GetTypes()
            from z in x.GetInterfaces()
            let y = x.BaseType
            where
            (y != null && y.IsGenericType &&
            openGenericType.IsAssignableFrom(y.GetGenericTypeDefinition())) ||
            (z.IsGenericType &&
            openGenericType.IsAssignableFrom(z.GetGenericTypeDefinition()))
            select x;
}

第二种方法将在此示例中找到 ConcreteUserRepo 和 IUserRepository:

This second method will find ConcreteUserRepo and IUserRepository in this example:

public class ConcreteUserRepo : IUserRepository
{}

public interface IUserRepository : IRepository<User>
{}

public interface IRepository<User>
{}

public class User
{}

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