從列表中選擇類

Question

特定值我有以下列表類

public class Users 
{ 
    public string Username 
    { 
     get; 
     set; 
    } 

    public string PlayerID 
    { 
     get; 
     set; 
    } 
} 

的我不知道我該如何選擇playerID其中username = X？

Answer 1

var player = playerList.FirstOrDefault(p => p.Username == "x"); 
if(player != null) 
{ 
    string id = player.PlayerID; 
}