Casting object to Implemented Interfaces

Question

I'm having a problem with Casting an object to it's implemented Interface, across different assemblies, the Interfaces are also using Generics.

I have 3 libraries. Contracts (Interface Location) Implementations (Interface Implementations) MainAssembly (Happens to be an ASP.NET MVC5 application)

Main references Contracts and Implementations. Implementations references Contracts.

Contracts Contains 2 Interfaces, one uses a generic that is of the other Interface type

public interface IConfig{}
public interface IStore<TConfig> where TConfig : IConfig{}

Implementations Contains 2 Classes that Implements these Interfaces like so.

public class ConfigBase : IConfig {}
public class Store<TConfig> :IStore<TConfig> where TConfig : ConfigBase {}

ASP.NET application Has a Class that Inherits from the ConfigBase class

public class Configuration : ConfigBase {}

Within the Contracts Library, there is a Service Class, that contains a Method that Requires a type of IStore

public void DoSomething(IStore<IConfig> store){}

However Passing in a type of Store is telling me it can't convert it. This is where the compile time error occurs, everything appeasrs to build correctly.

Store<Configuration> store = new Store<Configuration>();
serviceObj.DoSomething(store);

Answer 1

使用让您通用接口协变 out通用修饰符

public interface IStore<out TConfig> where TConfig : IConfig{}.