是否可以使用 .NET 泛型类实现 COM 接口?

Is it possible to implement a COM interface with a .NET generics class?(是否可以使用 .NET 泛型类实现 COM 接口?)

问题描述

我有以下界面，我试图让 COM 可见.当我尝试生成类型库时，它不喜欢我的实现类派生自泛型类的事实.

I have the following interface which I'm trying to make COM-visible. When I try to generate the type-library it doesn't like the fact that my implementation class derives from a generic-class.

是否可以将泛型类用作 COM 实现类?(我知道我可以编写一个非泛型包装器并将其导出到 COM，但这增加了另一个我宁愿不这样做的层.)

Is it possible to use a generic class as a COM implementation class? (I know I could write a non-generic wrapper and export that to COM, but this adds another layer that I'd rather do without.)

[ComVisible(true)]
public interface IMyClass
{
   ...
}

[ComVisible(true), ComDefaultInterface(typeof(IMyClass))]
[ClassInterface(ClassInterfaceType.None)]
public class MyClass : BaseClass<IMyClass>, IMyClass
{
   ...
} 

错误信息:

Warning: Type library exporter encountered a type that derives 
from a generic class and is not marked as 
[ClassInterface(ClassInterfaceType.None)]. Class interfaces cannot
be exposed for such types. Consider marking the type with 
[ClassInterface(ClassInterfaceType.None)] 
and exposing an explicit interface as the default interface to 
COM using the ComDefaultInterface attribute.

推荐答案

无法导出泛型类型和派生自泛型类型的类型.在您的 MyClass 类型上设置 ComVisible(false).您需要创建非泛型类实现或仅使用接口.

Generic types and types that derive from a generic type cannot be exported. Set ComVisible(false) on your MyClass type. You'll need to either create a non-generic class implementation or use the interface only.

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