获取PeopleEditor控件中的用户或用户组

今天开发了一个WebPart用于查询权限，里面用到了一个PeopleEditor控件用于选择用户或用户组，代码如下：

<SharePoint:PeopleEditor MultiSelect="false" SelectionSet="User,SPGroup" ID="PeopleSelected" Width="300" runat="server"/>

里面限制了用户不能多选，且选择的对象只能是User或SharePoint的用户组，我现在需要提取这个控件里面选择的用户或用户组的信息，于是写了如下一个方法来实现：

public SPPrincipal GetSPPrincipalFromPeopleEditor(string webName, PeopleEditor pe)
 2         {
 3             SPPrincipal user =null;
 4             SPSite mySite = SPContext.Current.Site;
 5             SPWeb myWeb = mySite.OpenWeb(webName);
 6             SPUserCollection allusers = myWeb.SiteUsers;
 7             SPGroupCollection allgroups = myWeb.SiteGroups;
 8             
 9 string principalType = ((PickerEntity)pe.ResolvedEntities[0]).EntityData["PrincipalType"].ToString();
10 string name = ((PickerEntity)pe.ResolvedEntities[0]).Key;
11 if (principalType =="User"|| principalType =="SecurityGroup")
12             {                
13 foreach (SPUser u in allusers)
14                 {
15 if (u.LoginName == name)
16                     {
17                         user = u;
18                     }
19                 }
20             }
21 elseif (principalType =="SharePointGroup")
22             {
23 foreach (SPGroup g in allgroups)
24                 {
25 if (g.Name == name)
26                     {
27                         user = g;
28                     }
29                 }
30             }
31 return user;
32         }

其实如果PeopleEditor控件设置只能单选用户，就可以用如下简单的代码提取出来：

string loginName = ((PickerEntity)PeopleEditor.ResolvedEntities[0]).EntityData["AccountName"].ToString(); 
2 SPUser u = SPContext.Current.Site.RootWeb.SiteUsers[loginName];