Igor Pashchuk
2020-11-29 00:26:34
I hope this is not homework! This will do the trick:
var joined = from column in columnList.Select((x, i) => new {Index = i + 1, Column = x} )
join index in fList on column.Index equals index
select column.Column;
Console.WriteLine(string.Join(",", joined));
// output
// column1,column3,column5,column10,column12
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