Mar 01, 2017 04:22 PM|gib9898_00|LINK
Sorry, I made a mistake in the code above. Here's how I get the error:
var d = GetData();
var l = d.ToList();
var e = d.Where(some condition).GroupBy(some property).Select(new object); // <-- ERROR: "The result of a query cannot be enumerated more than once."