我可以从DirectorySearcher获得1000条以上的记录吗？ [英] Can I get more than 1000 records from a DirectorySearcher?

问题描述

我刚刚注意到结果的返回列表限制为1000。我的域（HUGE域）中有1000多个组。如何获得超过1000条记录？我可以从以后的唱片开始吗？我可以将其划分为多个搜索吗？

I just noticed that the return list for results is limited to 1000. I have more than 1000 groups in my domain (HUGE domain). How can I get more than 1000 records? Can I start at a later record? Can I cut it up into multiple searches?

这是我的查询：

DirectoryEntry dirEnt = new DirectoryEntry("LDAP://dhuba1kwtn004");
string[] loadProps = new string[] { "cn", "samaccountname", "name", "distinguishedname" };
DirectorySearcher srch = new DirectorySearcher(dirEnt, "(objectClass=Group)", loadProps);
var results = srch.FindAll();

我尝试设置 srch.SizeLimit = 2000; ，但是似乎不起作用。有任何想法吗？

I have tried to set srch.SizeLimit = 2000;, but that doesn't seem to work. Any ideas?

推荐答案

您需要将DirectorySearcher.PageSize设置为非零值才能获得所有结果。

You need to set DirectorySearcher.PageSize to a non-zero value to get all results.

顺便说一句，您还应该在完成后使用DirectorySearcher

BTW you should also dispose DirectorySearcher when you're finished with it

using(var srch = new DirectorySearcher(dirEnt, "(objectClass=Group)", loadProps))
{
    srch.PageSize = 1000;
    var results = srch.FindAll();
}

API文档不是很清楚，但本质上是：

The API documentation isn't very clear, but essentially:

• 当您进行分页搜索时，将忽略SizeLimit，并且当您遍历FindAll返回的结果时，将返回所有匹配的结果。结果将一次从服务器检索到一页。我选择了1000以上的值，但是如果愿意，可以使用较小的值。折衷方案是：使用较小的PageSize将更快地返回结果的每一页，但是在迭代大量结果时将需要更频繁地调用服务器。

• when you do a paged search, the SizeLimit is ignored, and all matching results are returned as you iterate through the results returned by FindAll. Results will be retrieved from the server a page at a time. I chose the value of 1000 above, but you can use a smaller value if preferred. The tradeoff is: using a small PageSize will return each page of results faster, but will require more frequent calls to the server when iterating over a large number of results.

默认情况下，不分页搜索（PageSize = 0）。在这种情况下，最多返回SizeLimit结果。

by default the search isn't paged (PageSize = 0). In this case up to SizeLimit results is returned.

正如Biri所指出的那样，重要的是要处置由返回的SearchResultCollection。 FindAll，否则您可能会出现所述的内存泄漏在DirectorySearcher.FindAll 的MSDN文档的备注部分中。

As Biri pointed out, it's important to dispose the SearchResultCollection returned by FindAll, otherwise you may have a memory leak as described in the Remarks section of the MSDN documentation for DirectorySearcher.FindAll.

在.NET 2.0或更高版本中避免这种情况的一种方法是编写包装方法会自动处理SearchResultCollection。这可能看起来像以下内容（或可能是.NET 3.5中的扩展方法）：

One way to help avoid this in .NET 2.0 or later is to write a wrapper method that automatically disposes the SearchResultCollection. This might look something like the following (or could be an extension method in .NET 3.5):

public IEnumerable<SearchResult> SafeFindAll(DirectorySearcher searcher)
{
    using(SearchResultCollection results = searcher.FindAll())
    {
        foreach (SearchResult result in results)
        {
            yield return result;        
        } 
    } // SearchResultCollection will be disposed here
}

然后可以按以下方式使用它：

You could then use this as follows:

using(var srch = new DirectorySearcher(dirEnt, "(objectClass=Group)", loadProps))
{
    srch.PageSize = 1000;
    var results = SafeFindAll(srch);
}

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