从C ++/CLI到C#的托管枚举 [英] managed enum from C++/CLI to C#

问题描述

我有以下托管课程

I have the following managed class

namespace Managed_DLL
{
public ref class AController
{    
public:        
       delegate void didChangeListenerStatus(tListenerStatus status);

....};

// header file
#if defined(_MANAGED)
namespace Managed_DLL
{
#define ENUMKEYWORD public enum
#else
#define ENUMKEYWORD typedef enum
#endif
ENUMKEYWORD tListenerStatus
{    
kListenerStopped,    
kListenerRunning,    
kListenerFailed} ;
}

我已经在dll预处理程序定义中定义了_MANAGED
在C#应用程序中，我已在其中一个类中将didChangeListenerStatus定义为

I have defined the _MANAGED in the dll preprocessor defines
In C# app I have defined the didChangeListenerStatus in one of classes as

using Managed_DLL
....
public void didChangeListenerStatus(tListenerStatus status)        
{            
Console.WriteLine(" didChangeListnerStatus called");        
}

当我编译C#应用程序时，出现以下错误

When I compile the C# app it gives the following error

Error   4   ''tListenerStatus'' is inaccessible due to its protection level   Error   3   Inconsistent accessibility: parameter type ''tListenerStatus'' is less accessible than method ''ADemo.ViewController.didChangeListenerStatus(tListenerStatus) 

推荐答案

只需找到类型tListenerStatus的声明并将其公开.


(请记住:C#和C ++/CLI之间没有互操作问题，对于所有.NET语言都相同.但是，C ++/CLI有一个特殊功能:引用类型的值语义"，这不是可以用其他语言提供.换句话说，您只能使用"^"引用类型进行互操作.)

—SA

Just locate the declaration of the type tListenerStatus and make it public.


(Remember: there is not inter-operation problems between C# and C++/CLI, the same stands for all .NET languages. However, there is one special feature of C++/CLI: the "value semantic" for reference types, which is not available in other languages. In other words, you can only use "^" reference types for inter-operation.)

—SA

我不认为您的预处理程序指令有效，并且正如其他答案所指出的那样，您不需要一个纯托管类.只需按照以下步骤声明头文件即可:

I don''t think your preprocessor directive is working, and as was pointed out in the other answer, you don''t need it for a purely managed class. Just make your header file declaration as follows:

namespace Managed_DLL
{
    public enum tListenerStatus
    {    
        kListenerStopped,
        kListenerRunning,
        kListenerFailed
    };
}

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