[Solved]-How to break link between source collection and LINQ result-LINQ,C#

score:0

... = this.distinct().tolist()

larry 17207

score:1

var distinctcodes= this.distinct().tolist();

this.clear();

var c1 = this.count(); // 0

var c2 = distinctcodes.count(); // eg. 100

vland 4051

score:1

var distinctcodes = this.tolist().distinct();

brz 5706