error C3395: __declspec(dllexport) cannot be applied to a function with the __clrcall calling conv

在MFC DLL导出函数中传.net对象，不可以，有编译错误如下：

error C3395: 'MyClass::Function' : __declspec(dllexport) cannot be applied to a function with the __clrcall calling convention

 

解决方法是，为参数包上 gcroot<>.

class AFX_EXT_CLASS MyClass
{
public:
    void Function(MyDotNetClass^ obj); //compile error
    void Function(gcroot<MyDotNetClass^> obj); // this is correct
}