DirectorySearcher not searching entire directory [duplicate]

This question already has an answer here: Can I get more than 1000 records from a DirectorySearcher? (1 answer) Closed 3 years ago.

I'm using System.DirectoryServices.DirectorySearcher for traversing Active Directory for users. In most cases, this works fine. The code is pretty much as follows:

Ldapconnection conn = CreateConnection(.开发者_高级运维..);
System.DirectoryServices.DirectorySearcher searcher = new System.DirectoryServices.DirectorySearcher();
searcher.SearchScope = System.DirectoryServices.SearchScope.Subtree;

foreach (System.DirectoryServices.SearchResult result in searcher.FindAll()) {
}

For some reason, this doesn't always traverse the tree completely. If I specify the searchroot to point at a missing subtree, it does import that subtree.

Am I missing something?

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Is it stopping at 1000 users? I believe AD is setup by default to only return 1000 objects.

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If the SearchResultCollection's count is 1000 in the cases that you experience the problematic behavior, try setting the PageSize property on the DirectorySearcher to 1000.

Ldapconnection conn = CreateConnection(...); 
DirectorySearcher searcher = new System.DirectoryServices.DirectorySearcher();
searcher.SearchScope = System.DirectoryServices.SearchScope.Subtree;
searcher.PageSize = 1000;

foreach (System.DirectoryServices.SearchResult result in searcher.FindAll()) { }