Grouping List by the last Char

Question

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Hi,

As you can see on the picture above i have a List "keys" filled with Request.Form.AllKeys which a key starts with "txt".

I want to group them by their last id, for example

[0] "txtTitle:2" "txtDescription:2"
[1] "txtTitle:3" "txtDescription:3"

How can i achive this with lambda expression.

Thank you very much

Answer 1

var groups = keys.GroupBy(e=>e.Split(':').Last());