public static string test() { var list = new ArrayList <GroupByAux> { new GroupByAux { Key = "a", Value = "b" }, new GroupByAux { Key = "a", Value = "c" }, new GroupByAux { Key = "d", Value = "e" }, new GroupByAux { Key = "d", Value = "f" }, new GroupByAux { Key = "d", Value = "g" } }; var result = ""; foreach (var g in list.groupBy(p => p.Key)) { result += "(" + g.Key + ")"; foreach (var e in g) { result += e.Value; } } return(result); }
public static string test() { var list = new ArrayList<GroupBy2Aux> { new GroupBy2Aux { Key = "a", Value = "b" }, new GroupBy2Aux { Key = "a", Value = "c" }, new GroupBy2Aux { Key = "d", Value = "e" }, new GroupBy2Aux { Key = "d", Value = "f" }, new GroupBy2Aux { Key = "d", Value = "g" } }; var result = ""; foreach (var g in list.groupBy(p => p.Key, p => p.Value.toUpperCase())) { result += "(" + g.Key + ")"; foreach (var e in g) { result += e; } } return result; }