Enumerable.ToDictionary(TSource, TKey) Method (IEnumerable(TSource), Func(TSource, TKey)) (System.Linq): 

class Package
{
     public string Company { get; set; }
     public double Weight { get; set; }
     public long TrackingNumber { get; set; }
}

//...

// Create a Dictionary of Package objects, 
// using TrackingNumber as the key. 
Dictionary dictionary = 
     packages.ToDictionary(p => p.TrackingNumber);


Oh, good heavens. Really? Lambda expressions? Obfuscationing weirds language.

(In retrospect, that last sentence would potentially make for a better blog name.)

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