Question

我一直在Scott Allen的Puralsight course on Linq Fundamentals工作，这个链接部分描述了使用命名空间前缀读取xml，但我无法使其工作。

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<OutboundEvent
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="urn:abb.com:assetsuite:IF:Event http://apifw/devifa/xml/GeneralLedger/GeneralLedger.Publish.Event.V940.xsd"
    xmlns="urn:abb.com:assetsuite:IF:Event"
    xmlns:hdr="urn:abb.com:assetsuite:IF:Header"
    xmlns:bo="urn:abb.com:assetsuite:IF:BO"
    xmlns:boe="urn:abb.com:assetsuite:IF:IFExtension"
>
...
    <bo:BusinessObject>
    ...
    </bo:BusinessObject>
</OutboundEvent>

我应该从以下代码返回一个XElement，但我不是：

var document = XDocument.Load(path);
var bo = (XNamespace)"urn:abb.com:assetsuite:IF:BO";

var businessobjects =
    from elements in document.Element("OutboundEvent")?.Elements(bo + "BusinessObject") 
        ?? Enumerable.Empty<XElement>()
    select elements;

Answer 1

OutboundEvent节点位于命名空间中，但您的代码引用它，就好像它不是。它位于urn:abb.com:assetsuite:IF:Event名称空间中。

XNamespace ns = "urn:abb.com:assetsuite:IF:Event";
XNamespace bo = "urn:abb.com:assetsuite:IF:BO";
var businessObjects =
    document.Elements(ns + "OutboundEvent").Elements(bo + "BusinessObject");

Answer 2

您不应该为OutboundEvent元素定义和使用默认命名空间吗？

var document = XDocument.Load(path);
var ns = (XNamespace)"urn:abb.com:assetsuite:IF:Event";
var bo = (XNamespace)"urn:abb.com:assetsuite:IF:BO";

var businessobjects =
    from elements in document.Element(ns + "OutboundEvent")?.Elements(bo + "BusinessObject") 
        ?? Enumerable.Empty<XElement>()
    select elements;

Linq到XML，命名空间前缀不起作用

2 个答案: