Question

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Why does this conversion doesn't work?

Hi,
i discovered a strange behaviour of the framework.
This code throws an exception:

    byte a = 1;
    object b = a;
    Console.WriteLine(b.GetType());
    Console.WriteLine((byte)b);
    Console.WriteLine((int)(byte)b);
    Console.WriteLine(Convert.ToInt32(b));
    Console.WriteLine((int)b);

The last line throws a System.InvalidCastException.
I’d like to know what are the mechanism in the framework that make this code illegal.
Is it a problem of boxing/unboxing?!

Answer 1

Eric Lippert has a blog post on this.

Why? Because a boxed T can only be
unboxed to T.

Or Nullable< T >.