DirectoryEntry entry = new DirectoryEntry("LDAP://域名",域内任一帐户名","password" );
DirectorySearcher mySearcher = new DirectorySearcher(entry);
mySearcher.Filter = "(&(objectClass=user)(cn=" + user.Name + "))"; //搜索适配器
mySearcher.PropertiesToLoad.Add("userPrincipalName");//添加自己需要找的属性
mySearcher.PropertiesToLoad.Add("department");
mySearcher.PropertiesToLoad.Add("mail");
mySearcher.PropertiesToLoad.Add("title");
var result = mySearcher.FindOne(); //找到自己需要的一个
System.Security.Principal.WindowsIdentity
SPSecurity.RunWithElevatedPrivileges(delegate()
{}）
