1
我有以下XML,我通过XDocument.Load(uri)
或XElement.Load(uri)
加载。我无法通过LINQ获取<asset>
元素的集合。在VB.NET中查询LINQ to XML提要
这里是XML我想要查询的一个片段:
<assetCollection xmlns="tag:aisle7.net,2009:/api/1.0">
<title>All Assets</title>
<description>Collection containing all assets in the system</description>
<resourcePath>/us/assets/~all</resourcePath>
<link rel="self" href="http://web.aisle7.net/api/1.0/us/assets/~all?apikey=1234567890&Format=XML" />
<link rel="first" href="http://web.aisle7.net/api/1.0/us/assets/~all?apikey=1234567890&Format=XML" />
<link rel="next" href="http://web.aisle7.net/api/1.0/us/assets/~all?apikey=1234567890&Format=XML&page=2" />
<link rel="last" href="http://web.aisle7.net/api/1.0/us/assets/~all?apikey=1234567890&Format=XML&page=66" />
<updated>2011-03-01T19:01:49.667Z</updated>
<assets>
<asset>
<title>Homeopathy</title>
<resourcePath>/us/assets/toc/homeopathy</resourcePath>
<link rel="alternate" href="http://web.aisle7.net/api/1.0/us/assets/toc/homeopathy?apikey=1234567890&Format=XML" />
<updated>2011-03-01T19:01:49.667Z</updated>
</asset>
<asset>
<title>What Is Homeopathy?</title>
<resourcePath>/us/assets/generic/what-is-homeopathy_13615_1</resourcePath>
<link rel="alternate" href="http://web.aisle7.net/api/1.0/us/assets/generic/what-is-homeopathy_13615_1?apikey=1234567890&Format=XML" />
<updated>2011-03-01T19:00:17.680Z</updated>
</asset>
...
,这里是我想要使用的代码:
Dim uri As String = HttpUtility.UrlDecode(ConfigurationManager.AppSettings("Aisle7_Index_Url"))
Dim assets = (From a In XElement.Load(uri)
.Element("assets")
.Elements("asset")
Select a)
For Each asset In assets
Console.WriteLine(asset)
Next
没有骰子。调试'资产'显示消息“类型'异常'System.Linq.SystemCore_EnumerableDebugViewEmptyException'被抛出。”在检查员。有任何想法吗? – 2011-03-09 20:38:37
你刚刚发布的第二个代码段抛出一个NullReferenceException :( – 2011-03-09 20:44:07
@Mark显然它不喜欢你的'xmlns =“标签:aisle7.net,2009:/api/1.0”'。如果我删除它,两个代码段都可以正常工作。 ? – 2011-03-09 20:51:36