Many years ago, in 2012, I wrote an extension method which converted an IEnumerable to a multi-key dictionary. I previously blogged about the use-case of the multi-key dictionary here.
This was written in VB.Net which was less unpopular at that time. Today have I have converted the code to C# and set up a proper repository in Github.
The old gist is no longer there. The only step I have done with the conversion is just making sure that it complies. In the upcoming weeks/months I will write some tests to establish that is still working as intended.
The github project can be found here.
Develop! 
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