您可以使用以下代码搜索AD：

DirectoryEntry adEntry = null; private void SetADInfoAndCredentials() { adEntry = new DirectoryEntry("LDAP://" + ad_textBox.Text); adEntry.Username = user_textBox.Text; adEntry.Password = pw_textBox.Text; } private void SearchForMailInAD() { DirectorySearcher adSearcher = new DirectorySearcher(adEntry); adSearcher.Filter = ("mail=" + mail_textBox.Text); SearchResultCollection coll = adSearcher.FindAll(); foreach (SearchResult item in coll) { foundUsers_listBox.Items.Add(item.GetDirectoryEntry()); } } 

€：这将搜索托管所有邮件地址的proxyAddresses中的邮件地址

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  public static SearchResultCollection FindAccountByEmail(string pEmailAddress) { string filter = string.Format("(proxyaddresses=SMTP:{0})", email); using (DirectoryEntry gc = new DirectoryEntry("LDAP:")) { foreach (DirectoryEntry z in gc.Children) { using (DirectoryEntry root = z) { using (DirectorySearcher searcher = new DirectorySearcher(root, filter, new string[] { "proxyAddresses", "objectGuid", "displayName", "distinguishedName" })) { searcher.ReferralChasing = ReferralChasingOption.All; SearchResultCollection result = searcher.FindAll(); return result; } } } } return null; }