如何添加一棵樹的所有樹葉到C＃列表中

Question

我目前正在編寫一些代碼，通過一些LDAP查詢來搜索Active Directory。我遇到了類型爲Principal的對象，這是GroupPrincipal或UserPrincipal。但是，如果它是GroupPrincipal它可能包含UserPrincipal類型的對象。我想將類型UserPrincipal的所有項目提取到一個列表中，以便我可以對其執行一些其他過程。

我想可以使用樹做，但我不知道如何。

這裏是我寫的是無效代碼，只去兩個節點深，打印的名字，而不是將其添加到列表：

foreach (var principal in group.GetMembers()) 
{ 
    if (principal is UserPrincipal) 
    { 
     var uPrincipal = principal as UserPrincipal; 
     Console.WriteLine("User: " + uPrincipal.Name); 
    } 
    else if (principal is GroupPrincipal) 
    { 
     var gPrincipal = principal as GroupPrincipal; 
     Console.WriteLine("Group: " + gPrincipal.Name); 
     foreach(var principalito in gPrincipal.GetMembers()) 
     { 
      if (principalito is UserPrincipal) 
      { 
       var uPrincipalito = principalito as UserPrincipal; 
       Console.WriteLine(">>User: " + uPrincipalito.Name); 
      } 
      else if(principalito is GroupPrincipal) 
      { 
       var gPrincipalito = principalito as GroupPrincipal; 
       Console.WriteLine(">>Group: " + gPrincipalito.Name); 
      } 
     } 
    } 
} 

Answer 1

試試這個：

public void getAllUserPrinicpals(ref List<UserPrincipal> principals, GroupPrincipal principal) 
    { 
     if (principal != null) 
     { 
      foreach (Principal princ in principal.GetMembers(true)) 
      { 
       if (princ is UserPrincipal) 
        principals.Add((UserPrincipal)princ); 
       else if (princ is GroupPrincipal) 
        getAllUserPrinicpals(ref principals, (GroupPrincipal)princ); 
      } 
     } 
    }