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Editorial Team
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Asked: 2026-05-12T14:46:01+00:00

When I try to create a class in managed C++ that inherits from ObservableCollection

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When I try to create a class in managed C++ that inherits from ObservableCollection I get the error:
error C2039: ‘ObservableCollection’ : is not a member of ‘System::Collections::ObjectModel’

Here’s my code:

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

public ref class DataMatrix : public System::Collections::ObjectModel::ObservableCollection<array<Object^>^> {};

Why can’t I use this class from C++-CLI? I have no difficulty using it in C#.

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1 Answer

  1. Editorial Team

    Did you make sure to add a reference to WindowsBase.dll? ObservableCollection<T> lives in this DLL and it is not included on the default references list for a C++ project.

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