Question

Here a little test code illustrating the problem:

Compiling configurations:

Common Language Runtime Support: /clr

C++ Language

Error message:

Error 4 error C2065: ‘DataContractSerializer’ : undeclared identifier C:…\SerializationTest.cpp 21 1 SerializationTest

The code:

// SerializationTest.cpp : main project file.

#include "stdafx.h"

using namespace System::Collections::Generic;
using namespace System;

using namespace System::IO;
using namespace System::Xml;
using namespace System::Runtime::Serialization;

int main(array<System::String ^> ^args)
{
    Console::WriteLine(L"Hello World");

    Dictionary<System::String^, System::Double>^ teste = gcnew Dictionary<System::String^, System::Double>();
    teste->Add("Teste1",2);
    teste->Add("Teste2",4);    

    DataContractSerializer^ serializer = gcnew DataContractSerializer(teste->GetType());
    StringWriter^ writer = gcnew StringWriter();
    XmlTextWriter^ stm = gcnew XmlTextWriter(writer);
    serializer->WriteObject(stm, teste);

    Console::WriteLine(writer->ToString());

    return 0;
}

Answer 1

It sounds simply like you’re missing a reference to System.Runtime.Serialization.dll (which is required in addition to the using directive):

#using <System.Runtime.Serialization.dll>