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IEnumerable次のクラスを返す関数があります
IEnumerable
public class User { public string UserName { get; set; } public IList<string> MemberOf { get; set; } }
IEnumerable を LookUp に変換するにはどうすればよいですか? キーはユーザー名になり、値は memberOf のリストになります
IEnumerable<User> seq = ...; ILookup<string, IList<string>> lookup = seq.ToLookup(u => u.UserName, u => u.MemberOf);