Get user by email address from active directory

sirnose1 · Jun 15, 2012

I am trying to write some code which will search a a domain forest and find a user by thier email address. I can get it to find and loop through all the domains in the forest, but i cant get the results. Program says that the person is in all domains. Thier is an issue with my code. Please advise. Thanks!

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.DirectoryServices;
using System.DirectoryServices.ActiveDirectory;
using System.Diagnostics;

namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
var allDomains = Forest.GetCurrentForest().Domains.Cast<Domain>();
int x = 0;

foreach (Domain d in allDomains)
{
string email = "someone@somewhere.com";
var searcher = new DirectorySearcher(new DirectoryEntry("LDAP://" + d.Name));
searcher.Filter = "(ObjectClass=user)" ;
SearchResult result = searcher.FindOne();
ResultPropertyCollection myResult;

if (result != null)
{
myResult = result.Properties;
x++;
Console.WriteLine("Found it!" + email + "is on domain " + d.ToString());
Console.WriteLine("Display Name : " + myResult.PropertyNames.ToString());
}
}
}

}
}

Qik3Coder · Jun 15, 2012

You're not actually "filtering". You just grabbed the whole domain and validated that there was AN entry.

Your filter should have something like:

Code:

searcher.Filter = "(ObjectClass=user) (email=" + email + ")";

Lodlaiden

You've got questions and source code. We want both!
Oh? That? That's not an important password. - IT Security Admin (pw on whiteboard)

ralphtrent · Jun 15, 2012

I did this:

Code:

var allDomains = Forest.GetCurrentForest().Domains.Cast<Domain>();
int x = 0;

bool breaking = false;
foreach (Domain d in allDomains)
{
	string email = "", displayName = "", samaccountname  = "";
    var searcher = new DirectorySearcher(new DirectoryEntry("LDAP://" + d.Name));
    searcher.Filter = "(ObjectClass=user)";
    SearchResultCollection result = searcher.FindAll();

    foreach (SearchResult sr in result)
    {
		if (sr.Properties["mail"].Count > 0)
        {
			if (sr.Properties["mail"][0].ToString().ToLower().Equals("emailaddress@domain.com"))
            {
				samaccountname = sr.Properties["samaccountname"][0].ToString();
                email = sr.Properties["mail"][0].ToString();
				displayName = sr.Properties["displayname"][0].ToString();

                Console.WriteLine("Found it! " + email + " is on domain " + d.ToString());
                Console.WriteLine("Display Name : " + displayName);
                Console.WriteLine("Account Name: " + samaccountname);

                breaking = true;
                break;
			}
		}
	}
	searcher = null;
    if (breaking) { break; }
}

sirnose1 · Jun 15, 2012

(&(ObjectClass=user) (email=" + email + "))" was it! Thanks a lot. Had to add the & due to .net.

sirnose1 · Aug 17, 2012

The code finds the users sometimes but not all the time, even if it is the same user. It seems like it times out. I put a couple of threads into the code to slow it down, but to no evail. I noticed that It wont find users at all located on the west coast. I heard something about "paging". Is this a network issue? I can't seem to narrow it down.

static void Main(string[] args)
{
var allDomains = Forest.GetCurrentForest().Domains.Cast<Domain>();
int x = 0;
Console.Write("Enter an email address: ");
string email = Console.ReadLine();

foreach (Domain d in allDomains)
{
Thread.Sleep(500);
var searcher = new DirectorySearcher(new DirectoryEntry("LDAP://" + d.Name));
searcher.Filter = "(&(ObjectClass=user)(mail=" + email + "))";
SearchResult result = searcher.FindOne();
ResultPropertyCollection myResult;

//If found in Active Directory
if (result != null)
{
Thread.Sleep(500);
myResult = result.Properties;
x++;
string ADName = result.Properties["name"][0].ToString();
string[] splitADName = ADName.Split(',');
string firstName = splitADName[1];
string lastName = splitADName[0];
Console.WriteLine("Found " + firstName + " " + lastName + " is on domain " + d.Name);
}
}
if (x == 0)
{
email = "";
Console.WriteLine("Not Here");
}
}

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Get user by email address from active directory

sirnose1

Programmer

Qik3Coder

Programmer

ralphtrent

Programmer

sirnose1

Programmer

sirnose1

Programmer

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