Compiler Error C3498

'var': you cannot capture a variable that has a managed or WinRTtype

You cannot capture a variable that has a managed type or a Windows Runtime type in a lambda.

• Pass the managed or Windows Runtime variable to the parameter list of the lambda expression.

The following example generates C3498 because a variable that has a managed type appears in the capture list of a lambda expression:

// C3498a.cpp
// compile with: /clr
using namespace System;

int main()
{
   String ^ s = "Hello";
   [&s](String ^ r)
      { return String::Concat(s, r); } (", World!"); // C3498
}

The following example resolves C3498 by passing the managed variable s to the parameter list of the lambda expression:

// C3498b.cpp
// compile with: /clr
using namespace System;

int main()
{
   String ^ s = "Hello";
   [](String ^ s, String ^ r)
      { return String::Concat(s, r); } (s, ", World!");
}

Lambda Expressions