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C# - DirectorySearcher search result more than 1000

by 올엠 2020. 11. 1.
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When searching Active directory, DirectorySearcher will be used to retrieve information from Active Directory.

Below is the code that gets the username information.

string DomainPath = "LDAP://DC=domain,DC=com";
DirectoryEntry searchRoot = new DirectoryEntry(DomainPath);
DirectorySearcher search = new DirectorySearcher(searchRoot);
search.Filter = "(&(objectClass=user)(objectCategory=person))";
search.PropertiesToLoad.Add("samaccountname");
SearchResult result;
SearchResultCollection resultCol = search.FindAll();
foreach(SearchResult item in resultCol )
{
    string username = item.Properties.Contains("samaccountname");
    Console.WriteLine(username);
}

However, by default, only 1000 can be viewed.

To do this, you can use the property PageSize in DirectorySearcher.

It can be used as follows.

DirectoryEntry searchRoot = new DirectoryEntry(DomainPath);
DirectorySearcher search = new DirectorySearcher(searchRoot);
search.PageSize = 4000;

It is possible to input up to 32 bits INT size, but please input the appropriate number.

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