这abviously不可能的，这里是一个workarround：

 列表< UserPrincipal> searchPrinciples =新的List< UserPrincipal>（）; 
 searchPrinciples.Add（新UserPrincipal（上下文）{显示名称=汤姆*}）; 
 searchPrinciples.Add（新UserPrincipal（上下文）{SAM帐户=汤姆*}）; 
 searchPrinciples.Add（新UserPrincipal（上下文）{中间名=汤姆*}）; 
 searchPrinciples.Add（新UserPrincipal（上下文）{给定名称=汤姆*}）; 

名单，LT;主>结果=新的List<主>（）; 
变种搜索=新PrincipalSearcher（）; 
的foreach（在searchPrinciples VAR项）
 {
 =搜索新PrincipalSearcher（项目）; 
 results.AddRange（searcher.FindAll（））; 
} 
 

Is it possible to use System.DirectoryServices.AccountManagement.PrincipalSearcher to search based on multiple parameters using "or" (not "and").

i.e.

// This uses an and
//(&(objectCategory=person)(!UserAccountControl:1.2.840.113556.1.4.803:=2)(&(SAMAccountName=tom*)(DisplayName=tom*)))
var searchPrinciple = new UserPrincipal(context);
searchPrinciple.DisplayName =  "tom*";
searchPrinciple.SamAccountName = "tom*";

var searcher = new PrincipalSearcher();
searcher.QueryFilter = searchPrinciple;

var results = searcher.FindAll();

and I would like a search similar to this (in LDAP) using PrincipalSearcher (not DirectorySearcher)

// (&(objectCategory=person)(!UserAccountControl:1.2.840.113556.1.4.803:=2)(|(SAMAccountName=tom*)(DisplayName=tom*)))

It's abviously not possible, here is a workarround:

List<UserPrincipal> searchPrinciples = new List<UserPrincipal>();
searchPrinciples.Add(new UserPrincipal(context) { DisplayName="tom*"});
searchPrinciples.Add(new UserPrincipal(context) { SamAccountName = "tom*" });
searchPrinciples.Add(new UserPrincipal(context) { MiddleName = "tom*" });
searchPrinciples.Add(new UserPrincipal(context) { GivenName = "tom*" });

List<Principal> results = new List<Principal>();
var searcher = new PrincipalSearcher();
foreach (var item in searchPrinciples)
{
    searcher = new PrincipalSearcher(item);
    results.AddRange(searcher.FindAll());
}