Invoke C++/CLI code from C#

There are two projects (C# and Managed C++). C# projects needs to call a method in ManagedCPP project. in reference section of c# project the managed cpp dll is added.

if Line 1, 2 and 3 are uncommented and Line 4 is commented, then also following problem occurs:

Unhandled Exception: System.BadImageFormatException

The code base is as follows:

C# class:

using System.Runtime.InteropServices;
using ManagedCPP;

namespace CSharp
{
class Program
{
    //[DllImport("ManagedCPP")]                   // Line 1
    //public static extern void Convert();        // Line 2

    static void Main(string[] args)
    {
        new Program().CreateObject();
    }

    private void CreateObject()
    {
        //Convert();                              // Line 3
        ManagedCPPEntryClass c = new ManagedCPPEntryClass();  // Line 4

        Console.ReadKey();
    }
}
}

C++/CLI class(.h):

namespace ManagedCPP 
{
public ref class ManagedCPPEntryClass
{
    public:
        void Convert();
};
}

C++/CLI class(.cpp):

开发者_JAVA技巧

#include "ManagedCPP.h"
using namespace ManagedCPP;

void ManagedCPPEntryClass::Convert()
{
}

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Make sure your native code (C++) is compiled with the same format (32 bits or 64 bits) as the .Net execution format of your C# application(32 bits or 64 bits again). This may be the cause of your problem.

By default .Net executes itself in the same format as the OS. You can force execution in a chosen format by setting a compilation option in visual studio.

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I'm not an expert on the topic, but you should use DllImport to access a non-CLI assembly, while a CLI can be directly used in C# as if it were a native assembly (the advantage of using a common interface).

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Commented lines are used to call unmamaged API Convert from unmanaged Dll IPF_ManagedCPP. Actually, IPF_ManagedCPP is managed Dll, and Convert is managed class method. Of course, this cannot work.

C++/CLI class library should be used by client .NET code exactly like any other class library. Unmanaged Dll can be used in .NET project by two ways: using PInvoke or using C++/CLI wrapper. You don't need PInvoke for IPF_ManagedCPP library.