XDocument 包含命名空间 [英] XDocument containing namespaces
本文介绍了XDocument 包含命名空间的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我尝试使用 XDocument 查询以下 XML:
I have the following XML which I am trying to query with XDocument:
<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
<System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
<EventID>589828</EventID>
<Type>3</Type>
<SubType Name="Information">0</SubType>
<Level>8</Level>
<TimeCreated SystemTime="2010-06-01T09:45:15.8102117Z" />
<Source Name="System.ServiceModel" />
<Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" />
<Execution ProcessName="w3wp" ProcessID="5012" ThreadID="5" />
<Channel />
<Computer>TESTSERVER3A</Computer>
</System>
<ApplicationData>
<TraceData>
<DataItem>
<TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Information">
<TraceIdentifier>http://msdn.microsoft.com/en-GB/library/System.ServiceModel.Activation.WebHostCompilation.aspx</TraceIdentifier>
<Description>Webhost compilation</Description>
<AppDomain>/LM/W3SVC/257188508/Root-1-129198591101343437</AppDomain>
<Source>System.ServiceModel.Activation.ServiceParser/39498779</Source>
<ExtendedData xmlns="http://schemas.microsoft.com/2006/08/ServiceModel/StringTraceRecord">
<VirtualPath>/Service.svc</VirtualPath>
</ExtendedData>
</TraceRecord>
</DataItem>
</TraceData>
</ApplicationData>
</E2ETraceEvent>
执行以下代码为 xEl1 返回 null 除非我手动删除命名空间:
Executing the following code returns null for xEl1 except when I manually remove the namespaces:
XDocument xDoc = XDocument.Parse(CurrentString);
XElement xEl1 = xDoc.Element("E2ETraceEvent");
XElement xEl2 = xEl1.Element("System");
XElement xEl3 = xEl2.Element("Correlation");
XAttribute xAtt1 = xEl3.Attribute("ActivityID");
String sValue = xAtt1.Value;
如何编写代码来提取 XDocument 中的 Guid?
How do you write code to extract the Guid in XDocument?
推荐答案
试试这个,对我有用
XNamespace nsSys = "http://schemas.microsoft.com/2004/06/windows/eventlog/system";
XElement xEl2 = xDoc.Element(nsSys + "System");
XElement xEl3 = xEl2.Element(nsSys + "Correlation");
XAttribute xAtt1 = xEl3.Attribute("ActivityID");
String sValue = xAtt1.Value;
您需要使用命名空间.
完整的试用源
public static void Main()
{
XElement xDoc = XElement.Parse(
@"<E2ETraceEvent xmlns=""http://schemas.microsoft.com/2004/06/E2ETraceEvent"">
<System xmlns=""http://schemas.microsoft.com/2004/06/windows/eventlog/system"">
<EventID>589828</EventID>
<Type>3</Type>
<SubType Name=""Information"">0</SubType>
<Level>8</Level>
<TimeCreated SystemTime=""2010-06-01T09:45:15.8102117Z"" />
<Source Name=""System.ServiceModel"" />
<Correlation ActivityID=""{00000000-0000-0000-0000-000000000000}"" />
<Execution ProcessName=""w3wp"" ProcessID=""5012"" ThreadID=""5"" />
<Channel />
<Computer>TESTSERVER3A</Computer>
</System>
<ApplicationData>
<TraceData>
<DataItem>
<TraceRecord xmlns=""http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord"" Severity=""Information"">
<TraceIdentifier>http://msdn.microsoft.com/en-GB/library/System.ServiceModel.Activation.WebHostCompilation.aspx</TraceIdentifier>
<Description>Webhost compilation</Description>
<AppDomain>/LM/W3SVC/257188508/Root-1-129198591101343437</AppDomain>
<Source>System.ServiceModel.Activation.ServiceParser/39498779</Source>
<ExtendedData xmlns=""http://schemas.microsoft.com/2006/08/ServiceModel/StringTraceRecord"">
<VirtualPath>/Service.svc</VirtualPath>
</ExtendedData>
</TraceRecord>
</DataItem>
</TraceData>
</ApplicationData>
</E2ETraceEvent>");
XNamespace nsSys = "http://schemas.microsoft.com/2004/06/windows/eventlog/system";
XElement xEl2 = xDoc.Element(nsSys + "System");
XElement xEl3 = xEl2.Element(nsSys + "Correlation");
XAttribute xAtt1 = xEl3.Attribute("ActivityID");
String sValue = xAtt1.Value;
Console.WriteLine("sValue = {0}", sValue);
Console.ReadKey();
}
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