RePost Expression Trees

https://msdn.microsoft.com/en-us/library/bb882637.aspx

https://www.simple-talk.com/dotnet/.net-framework/dynamic-linq-queries-with-expression-trees/
http://www.dotnet-tricks.com/Tutorial/linq/RJX7120714-Understanding-Expression-and-Expression-Trees.html
http://www.tutorialsteacher.com/linq/expression-tree