show vector elements in listbox

Question

I would like to display the elements in a vector in a listbox. However, I'm constantly getting a error: error C2664: 'System::Windows::Forms::ListBox::ObjectCollection::Add' : cannot convert parameter 1 from 'std::basic_string<_Elem,_Traits,_Alloc>' to 'System::Object ^'

I am using windows form in c++/cli. this is the code:

for (size_t z = 0; z < container.size(); z++){
        listBox_name->Items->Add(container[z]);
    }

Answer 1

Based on the error message, your vector is a vector of std::string. Use marshal_as to convert the std::string to a managed String^ that the managed list box can accept.

for (size_t z = 0; z < container.size(); z++){
    listBox_name->Items->Add(marshal_as<String^>(container[z]));
}

If you find you're doing this a lot, consider changing your vector of std::string to be a fully-managed type, such as List<String^>^.