How to return List of strings from C# to Managed c++

Question

Am adding C# dll as reference in managed C++, and calling C# function in c++ which returns list of strings

C# code :

namespace ManagedCSharp
{   
  public static class ManagedClass
    {
        public static List<string> ShowValue(void)
        {
            List<string> x = new List<string>();
            x.Add("1");

            return x;

        }
    }
}

C++ Code:

public ref class DoWork
    {
    public:void GetListOfStrings(void)
        {           
           //here i need to collect list of strings returned from C#
            (??) =  ManagedCSharp::ManagedClass::ShowValue();   
        }
    };

Thanks in advance

Vikash Balasubramanian · Accepted Answer · 2015-06-09 06:30:33Z

1

If you are using managed C++ you can simply use:

List<string>^ myvar = ManagedCSharp::ManagedClass::ShowValue();

Of course you will have to add the using directive for System::Collections.

answered Jun 9, 2015 at 6:30

Vikash Balasubramanian

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1 Comment

RAMANJANEYULU U Over a year ago

List<String^>^ myvar = ManagedCSharp::ManagedClass::ShowValue(); use System::Collections::Generic

atlaste · Accepted Answer · 2015-06-09 06:45:02Z

First, I'd use C++/CLI for the interop. IMHO that makes life easy if you're mixing C++ and C# code.

Making namespaces explicit actually helps to make things clear in this case. C++ normally uses std::string, which can be converted to char*; C++/CLI uses System::String, which can be constructed (gcnew) from a System::Char* -- which are UTF-16 characters. To make the conversion, you need to apply an encoding, which can be found in System::Text::Encoding::ASCII::GetString. (or UTF-8 or whatever you use as your poison). It depends on what you put in your std::string.

Note that memory management in C++ and C# work quite differently. You still have to clean up your stuff on the unmanaged heap (if that applies); the constructor of System::String will simply copy the contents into a managed container.

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