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我想获取 windows 更新补丁的下载 url，我的代码是

        var session = new UpdateSession();
        var searcher = session.CreateUpdateSearcher();
        var searchType = "Type='Software' and IsInstalled =0";

        searcher.Online = false;
        var searchResult = searcher.Search(searchType);
        var collection = searchResult.Updates;

        foreach (IUpdate item in collection)
        {
            outpu("Title: \t{0}", item.Title);
            outpu("UpdateId: \t{0}", item.Identity.UpdateID);
            outpu("Description: \t{0}", item.Description);
            if (item.KBArticleIDs[0] == "2592687")
            {
                Trace.WriteLine("what");
            }
            if ((item.BundledUpdates.Count > 0) && (item.BundledUpdates[0].DownloadContents.Count >0))
                outpu("DownloadUrl: \t{0}", item.BundledUpdates[0].DownloadContents[0].DownloadUrl);
        }

通常我可以得到下载网址，但有时我不能。例如，当

KBArticleIDs = "2592687"

调试显示“DownloadContents”没有孩子，我该怎么办？

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