基于深度优先的递归判断域用户是否是某个组的成员

基于深度优先的递归判断域用户是否是某个组的成员
引用System.DirectoryServices
并导入名称空间
using  System.DirectoryServices;
功能:判断域用户(登录名)是否是某个域安全组的成员,域用户可能属于多个组,并且所属的组可能又属于多个组,所以需要递归调用.

private  DirectoryEntry entry  =   new  DirectoryEntry( " LDAP://domain " , @" domain\username " , " password " );
private   bool  UserisGroupMember( string  UserLogin, string  RoleName)
         {    
                        
            DirectorySearcher mySearcher  =   new  DirectorySearcher(entry);
            mySearcher.Filter = string .Format ( " (&(objectClass=user)(sAMAccountName={0})) " ,UserLogin );
            mySearcher.PropertiesToLoad.Add ( " memberof " );
            SearchResult mysr = mySearcher.FindOne();            

             if  (mysr.Properties .Count > 1 )  // 返回两个属性,一个是内置的adspath,另一个是PropertiesToLoad加载的
             {    
                 string  [] memberof = new   string  [mysr.Properties[ " memberof " ].Count ];
                 int  i = 0 ;
                 foreach ( Object myColl  in  mysr.Properties[ " memberof " ])
                 {
                    memberof[i] = myColl.ToString ().Substring ( 3 ,myColl.ToString ().IndexOf( " , " ) - 3 );                    
                     if  (memberof[i] == RoleName)
                         return   true ;
                    i ++ ;
                }//其实这一层循环是广度优先算法,因为考虑到一个人直接属于某个安全组的可能性要大一些,这样做效率更高.如果把下面这个循环放到上面的if的esle中,就是完全的深度优先了.
                                    
                 foreach  ( string  GroupName  in  memberof)                
                     if  (MemberisGroupMember(GroupName,RoleName))
                         return   true ;    
            }
             return   false ;
        }

         private   bool  MemberisGroupMember( string  GroupName, string  RoleName)
         {
            DirectorySearcher mySearcher  =   new  DirectorySearcher(entry);
            mySearcher.Filter = string .Format ( " (&(objectClass=group)(CN={0})) " ,GroupName );
            mySearcher.PropertiesToLoad.Add ( " memberof " );
            SearchResult mysr = mySearcher.FindOne();
             string  memberof;

             if  (mysr.Properties.Count  > 1 ) // 返回两个属性,一个是内置的adspath,另一个是PropertiesToLoad加载的
             {
                 foreach ( Object myColl  in  mysr.Properties[ " memberof " ])
                 {
                    memberof = myColl.ToString ().Substring ( 3 ,myColl.ToString ().IndexOf( " , " ) - 3 );                    
                     if  (memberof == RoleName)
                         return   true ;                                            
                     else
                         if  (MemberisGroupMember(memberof,RoleName))
                         return   true ;
                }
            }
             return   false ;
        }