C# 从字符串 xml 中获取节点值
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get node value from string xml
提问by foluis
I have this string XML
我有这个字符串 XML
string innerXml = @"<detail><WCFFaultExcepcion xmlns=""http://schemas.datacontract.org/2004/07/CIEL.DigiturnoMega.Entidades"" xmlns:i=""http://www.w3.org/2001/XMLSchema-instance""><ErrorId>b7e9d385-9118-4297-baca-db9ab00f3856</ErrorId><Message>índice fuera de los límites de la matriz.</Message></WCFFaultExcepcion></detail>";
This is the stringXML
这是 stringXML
<detail>
<WCFFaultExcepcion xmlns="http://schemas.datacontract.org/2004/07/CIEL.DigiturnoMega.Entidades" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<ErrorId>b7e9d385-9118-4297-baca-db9ab00f3856</ErrorId>
<Message>índice fuera de los límites de la matriz.</Message>
</WCFFaultExcepcion>
</detail>
What I want is to get the value of the detail Tag, I'm trying with this example but all return null o cero count, could you help me?
我想要的是获取详细信息标签的值，我正在尝试使用此示例，但都返回 null o cero 计数，您能帮我吗？
private static void Example()
{
string innerXml = @"<detail><WCFFaultExcepcion xmlns=""http://schemas.datacontract.org/2004/07/CIEL.DigiturnoMega.Entidades"" xmlns:i=""http://www.w3.org/2001/XMLSchema-instance""><ErrorId>b7e9d385-9118-4297-baca-db9ab00f3856</ErrorId><Message>índice fuera de los límites de la matriz.</Message></WCFFaultExcepcion></detail>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(innerXml);
XmlNode node = (XmlNode)doc.DocumentElement;
XmlNode optionalNode = node.SelectSingleNode("/detail/WCFFaultExcepcion");
XmlNode optionalNode1 = node.SelectSingleNode("detail/WCFFaultExcepcion");
XmlNode optionalNode2 = node.SelectSingleNode("/detail/WCFFaultExcepcion/ErrorId");
XmlNode optionalNode3 = node.SelectSingleNode("detail/WCFFaultExcepcion/ErrorId");
XmlElement optional = doc.SelectSingleNode(@"/detail/WCFFaultExcepcion/ErrorId") as XmlElement;
XmlElement optiona2 = doc.SelectSingleNode(@"detail/WCFFaultExcepcion/ErrorId") as XmlElement;
XmlNode xNode = doc.DocumentElement.SelectNodes("ErrorId")[0];
XmlNodeList xnList = doc.SelectNodes("/detail/WCFFaultExcepcion");
XmlNodeList xnList1 = doc.SelectNodes("detail/WCFFaultExcepcion");
XmlNodeList xnList2 = doc.SelectNodes("/detail/WCFFaultExcepcion/ErrorId");
XmlNodeList xnList3 = doc.SelectNodes("detail/WCFFaultExcepcion/ErrorId");
}
采纳答案by Swen Kooij
I think this might be the solution for you:
我认为这可能是您的解决方案：
XmlDocument doc = new XmlDocument();
doc.LoadXml(innerXml);
XmlNodeList ErrorIdTags = doc.GetElementsByTagName("ErrorId");
if(ErrorIdTags.Count <= 1)
{
// The tag could not be fond
}
else
{
// The tag could be found!
string ErrorId = ErrorIdTags[0].InnerText;
}
回答by nl-x
The first try XmlNode node = (XmlNode)doc.DocumentElement;should work and should contain children. Try XmlNode firstChildNode = node.FirstChild;... this will get you the first child, and won't be empty/null.
第一次尝试XmlNode node = (XmlNode)doc.DocumentElement;应该有效并且应该包含孩子。试试XmlNode firstChildNode = node.FirstChild;......这会让你得到第一个孩子，并且不会为空/空。
But when using xpath, you will get into problems because of the defined namespace. You will have to create a new namespace in doc, and assign http://schemas.datacontract.org/2004/07/CIEL.DigiturnoMega.Entidadesa shorthand (eg. sh) ... then later in your xpath you can like go doc.SelectSingleNode(@"/detail/sh:WCFFaultExcepcion/sh:ErrorId")
但是当使用 xpath 时，你会因为定义的命名空间而遇到问题。您必须在 doc 中创建一个新的命名空间，并分配http://schemas.datacontract.org/2004/07/CIEL.DigiturnoMega.Entidades一个速记（例如 sh）...然后在您的 xpath 中您可以喜欢 godoc.SelectSingleNode(@"/detail/sh:WCFFaultExcepcion/sh:ErrorId")
回答by aquaraga
Try using Linq to Xml (http://msdn.microsoft.com/en-us/library/bb387098%28v=VS.100%29.aspx) - the code will be really elegant.
尝试使用 Linq to Xml ( http://msdn.microsoft.com/en-us/library/bb387098%28v=VS.100%29.aspx) - 代码会非常优雅。
