var list = new [] {1, 2, 3}; list.Action(item => PrintItem(item));

class Paper { Paper(int width, int height) {Width = width, Height = height} int Width {get;set;} int Height {get;set;} } var list = new [] {new Paper(1,1), new Paper(1,3), new Paper(1,3)}; // notice repeat of Paper(1,3) var distinctItems = list.Distinct(item => item.Height); // should contain only 2 items - Paper(1,1) and Paper(1,3)

class Paper { Paper(int width, int height) {Width = width, Height = height} int Width {get;set;} int Height {get;set;} } var list = new [] {new Paper(1,1), new Paper(1,3), new Paper(2,3)}; var distinctItems = list.Distinct(item => item.Height, item => item.Width); // distinct items based on property Height if there are multiple then take highest based on Width // should contain only 2 items - Paper(1,1) and Paper(2,3) e.g Because 2 > 1 it took Paper(2,3) over Paper(1,3) var distinctItems = list.Distinct(item => item.Height, item => item.Width, takeMin: true); // distinct items based on property Height if there are multiple then take lowest based on Width // should contain only 2 items - Paper(1,1) and Paper(1,3) e.g Because 1 < 2 it took Paper(1,3) over Paper(2,3)