TIL... How to use ToDictionary

2018-06-05 This post is over 2 years old

So I was creating a bulk action in a controller. I needed to map a list of Ids to a dictionary of said Ids and their respective results. My initial thought was to use ForEach, but there was a great deal of unnecessary boiler-plate code involved. There had to be a better way. And of course there was. Naturally the ToDictionary function was invented by brilliant minds in anticipation of such a need. Here’s a rough example:

listOfId.ToDictionary(key=> key, value => MethodtoGetValue(value,otherParams));

Note that the key, and the value both come from the entry in the List, and are used to create the resulting key-value pair. Meaning that you could create a Key and a Value from functions that use the list entry as an input.