About Platform::String and Platform::Array

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Hello everyone , I'm recently developing some windows phone apps and I need to use some c++ libraries but I found some problems with the ref class and Platform::String ,Platform::Array which provides really low performance when calling both from c# and other ref class in c++...

it seems that calling ref new String() and simply adding two Strings using '+' is much slower than both System.String in c# and wstring in standard c++... Is there any solutions ? Because these are the only ways to return a string or array from native code to managed code and it seems that I have to use that ...

Thanks