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Compiler Error CS1686

Visual Studio 2008

Local 'variable' or its members cannot have their address taken and be used inside an anonymous method or lambda expression

This error is generated when you use a variable, and attempt to take its address, and one of these actions is done inside an anonymous method.

The following sample generates CS1686.

Copy 
// CS1686.cs
// compile with: /unsafe /target:library
class MyClass
{
   public unsafe delegate int * MyDelegate();

   public unsafe int * Test()
   {
      int j = 0;
      MyDelegate d = delegate { return &j; };   // CS1686
      return &j;   // OK
   }
}
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