This appears to be a typo, in both the downloadable sample code, and on page 51. The code in the ctor should test for inequality.

public class MySampleClass<T> {
    private static List<T> _values;

    static MySampleClass() {
        if (typeof(T).IsAbstract == false)
            throw new Exception("T must not be abstract");
        else
            _values = new List<T>();
    }
}


Ketil Wright

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Ketil Wright

I came here to look at the errata when I saw that too. I was hoping it wasn't just me.