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c#code-contracts

Contract.ForAll doesn't work?

I'm trying to use Contract.ForAll, and it looks like I'm missing something here.

Consider this small example:

        var l = new List<string>();
        Contract.Assume( Contract.ForAll( l, s => s != null ) );

        foreach ( var s in l ) Console.WriteLine( s.Length );

Despite the Contract.Assume call, I do get a "possible calling a method on a null reference" warning for s.Length.

Am I doing this right? Is it even supposed to work? Or am I missing something?

Solution

  • From the Code Contracts User Manual, section 6.6.1 Current Limitations of the Checker and Bugs:

    The static contract checker does not yet deal with quantifiers ForAll or Exists.