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Compiler Error CS0423

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Since 'class' has the ComImport attribute, 'method' must be extern or abstract

Specifying the ComImport attribute implies that the implementation for the class is to be imported from a COM module. Additional methods may not be defined.

The following sample generates CS0423:

// CS0423.cs

using System.Runtime.InteropServices;

[
  ComImport,
  Guid("7ab770c7-0e23-4d7a-8aa2-19bfad479829")
]
class ImageProperties
{
  public static void Main()  // CS0423
  {
    ImageProperties i = new ImageProperties();
  }
}