我正在尝试编写编译器在运行时无法解析的通用扩展方法，尽管 Visual Studio 的智能感知确实找到了它。
编译器错误是'SampleSolution.OtherGenericClass<SampleSolution.IGenericInterface<SampleSolution.ISimpleInterface>,SampleSolution.ISimpleInterface>' does not contain a definition for 'GenericExtensionMethod' and no extension method 'GenericExtensionMethod' accepting a first argument of type 'SampleSolution.OtherGenericClass<SampleSolution.IGenericInterface<SampleSolution.ISimpleInterface>,SampleSolution.ISimpleInterface>' could be found (are you missing a using directive or an assembly reference?)
这是一些我能想出的最简单形式的示例代码，可以重现问题。我知道我可以添加GenericExtensionMethod，IOtherGenericInterface但我需要一个扩展方法，因为它需要在实现之外IOtherGenericInterface。
public interface ISimpleInterface
{
}
public interface IGenericInterface<T>
{
}
public class GenericClass<T> : IGenericInterface<T>
{
}
public interface IOtherGenericInterface<TGenericDerived>
{
}
public class OtherGenericClass<TGenericInterface, TSimpleInterface> :
IOtherGenericInterface<TGenericInterface>
where TGenericInterface : IGenericInterface<TSimpleInterface>
{
}
public static class GenericExtensionMethods
{
public static IOtherGenericInterface<TGenericInterface>
GenericExtensionMethod<TGenericInterface, TSimple>(
this IOtherGenericInterface<TGenericInterface> expect)
where TGenericInterface : IGenericInterface<TSimple>
{
return expect;
}
}
class Program
{
static void Main(string[] args)
{
var exp = new OtherGenericClass<IGenericInterface<ISimpleInterface>,
ISimpleInterface>();
//exp.GenericExtensionMethod(); // This doesn't compile
}
}