基于C＃中的两个属性对directorySearcher进行排序

Question

I'm trying to get a sorted SearchResultCollection object based on department, and then by name (both alphabetical). I'm trying to load two properties, but this merely takes the last property specified and sorts it based on that.

My current code is the following:

DirectoryEntry entry = new DirectoryEntry(ConfigurationManager.AppSettings["LDAP"]);
DirectorySearcher search = new DirectorySearcher(entry)
{
    SearchScope = SearchScope.Subtree,
    Filter = "(&(objectClass=user)(physicalDeliveryOfficeName=Dartmouth))"
};
search.PropertiesToLoad.Add("name");
search.PropertiesToLoad.Add("phone");
search.PropertiesToLoad.Add("email");
search.PropertiesToLoad.Add("department");

search.Sort.Direction = System.DirectoryServices.SortDirection.Ascending;
search.Sort.PropertyName = "department";
search.Sort.PropertyName = "name";

SearchResultCollection result = search.FindAll(); 

But again, this only sorts by name. I need all users grouped by department, and from there sorted by name.

Answer 1

Cast the SearchResultCollection to an IEnumerable and then sort with a custom IComparer that you develop

var results = search.FindAll().Cast<SearchResult>()
                              .Sort(/*your IComparer<SearchResult>*/);

Sort the results on client side because server side sorts in AD are resource intensive.

In addition - if you have AD 2000 it doesn't support search on more than one attribute