我的代码不返回节点
- XmlDocument xml = new XmlDocument();
- xml.InnerXml = text;
- XmlNode node_ = xml.SelectSingleNode(node);
- return node_.InnerText; // node_ = null !
我很确定我的XML和Xpath是正确的.
我的Xpath:/ ItemLookupResponse / OperationRequest / RequestId
我的XML:
- <?xml version="1.0"?>
- <ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2005-10-05">
- <OperationRequest>
- <RequestId>xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx</RequestId>
- <!-- the rest of the xml is irrelevant -->
- </OperationRequest>
- </ItemLookupResponse>
由于某些原因,我的XPath返回的节点总是为空.有人可以帮忙吗?
解决方法
您的XPath几乎是正确的 – 它根本不考虑根节点上的默认XML命名空间!
- <ItemLookupResponse
- xmlns="http://webservices.amazon.com/AWSECommerceService/2005-10-05">
- *** you need to respect this namespace ***
您需要考虑到这一点,并更改您的代码:
- XmlDocument xml = new XmlDocument();
- xml.InnerXml = text;
- XmlNamespaceManager nsmgr = new XmlNamespaceManager(xml.NaMetable);
- nsmgr.AddNamespace("x","http://webservices.amazon.com/AWSECommerceService/2005-10-05");
- XmlNode node_ = xml.SelectSingleNode(node,nsmgr);
然后你的XPath应该是:
- /x:ItemLookupResponse/x:OperationRequest/x:RequestId
现在,你的node_.InnerText绝对不会是NULL了!