compiler-error-c3797.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: Compiler Error C3797	Compiler Error C3797	11/04/2016	C3797	C3797	ab27ff34-8c1d-4297-b004-9e39bd3a4f25

Compiler Error C3797

'override': event declaration cannot have override specifier (should be placed on event add/remove/raise methods instead)

You cannot override a trivial event (an event without explicitly defined accessor methods) with another trivial event. The overriding event must define its behavior with accessor functions.

For more information, see event.

Example

The following sample generates C3797.

// C3797.cpp
// compile with: /clr /c
delegate void MyDel();

ref class Class1 {
public:
   virtual event MyDel ^ E;
};

ref class Class2 : public Class1 {
public:
   virtual event MyDel ^ E override;   // C3797
};

// OK
ref class Class3 : public Class1 {
public:
   virtual event MyDel ^ E {
      void add(MyDel ^ d) override {}
      void remove(MyDel ^ d) override {}
   }
};