我可以得到从Asp.Net一个DirectorySearcher从1000多个记录？ [英] Can I get more than 1000 records from a DirectorySearcher in Asp.Net?

问题描述

我只注意到返回列表结果仅限于1000我有超过1000组，我的域名（巨大域）。我怎样才能得到超过1000条记录？我可以开始在以后的记录？我可以剪到多个搜索？

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?

下面是我的查询：

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();

我试图将 srch.SizeLimit = 2000; 但是这似乎并没有工作。任何想法？

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

推荐答案

您需要设置DirectorySearcher.PageSize为非零值来获取所有的结果。

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

顺便说一句，你也应该处理DirectorySearcher从当你用它完成后

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

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

API文档不是很清楚，但基本上是：

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

• 当你做一个分页搜索，了SizeLimit被忽略，所有匹配的结果，你通过的FindAll返回的结果迭代返回。结果将从服务器检索的网页的时间。我选择了1000的价值上面，但你可以使用一个较小的值，如果preferred。代价是：用一个小每页会返回结果更快的每一页，但需要遍历大量结果的时更频繁调用服务器

• 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.

在默认情况下搜索不分页（每页= 0）。在这种情况下最多的sizeLimit结果被返回。

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

由于蔽日指出，重要的是要通过处置返回的FindAll的SearchResultCollection，否则在MSDN文档DirectorySearcher.FindAll的备注部分描述可能有内存泄漏：<一href="http://msdn.microsoft.com/en-us/library/system.directoryservices.directorysearcher.findall.aspx">http://msdn.microsoft.com/en-us/library/system.directoryservices.directorysearcher.findall.aspx

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: http://msdn.microsoft.com/en-us/library/system.directoryservices.directorysearcher.findall.aspx

，以帮助避免这种在.NET 2.0或更高版本的一种方法是写一个包装方法，该方法将自动销毁SearchResultCollection。这可能看起来像下面（或者可能是在.NET 3.5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
}

您可以再使用此如下：

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

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