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Problem parsing through multiple elements in the XUnit XML file using XElement

I'm having trouble using XElement to parse multiple elements through an XUnit XML file and return the value.
Here is the XML File
<assemblies timestamp="07/31/2018 14:58:48">
<assembly name="C:\Users\bf\Documents\Visual Studio 2015\Projects\xUnitDemo\xUnitDemo\bin\Debug\xUnitDemo.DLL" environment="64-bit .NET 4.0.30319.42000 [collection-per-class, parallel (1 threads)]" test-framework="xUnit.net 2.3.1.3858" run-date="2018-07-31" run-time="14:58:47" config-file="C:\Users\bf\Documents\Visual Studio 2015\Projects\xUnitDemo\packages\xunit.runner.console.2.4.0\tools\net452\xunit.console.exe.Config" total="15" passed="14" failed="1" skipped="0" time="0.257" errors="0">
<errors />
<collection total="2" passed="1" failed="1" skipped="0" name="Test collection for xUnitDemo.SimpleTests" time="0.070">
<test name="xUnitDemo.SimpleTests.PassingTest" type="xUnitDemo.SimpleTests" method="PassingTest" time="0.0636741" result="Pass">
<traits>
<trait name="test" value="test" />
<trait name="requirement" value="test" />
<trait name="labels" value="test" />
</traits>
</test>
<test name="xUnitDemo.SimpleTests.FailingTest" type="xUnitDemo.SimpleTests" method="FailingTest" time="0.0059474" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
<message><![CDATA[Assert.Equal() Failure\r\nExpected: 5\r\nActual: 4]]></message>
<stack-trace><![CDATA[ at xUnitDemo.SimpleTests.FailingTest() in C:\Users\smsf\documents\visual studio 2015\Projects\xUnitDemo\xUnitDemo\SimpleTests.cs:line 30]]></stack-trace>
</failure>
</test>
</collection>
</assembly>
</assemblies>
I'm able to parse through test element using this code.
private static List<TestResults> GetTestAutomationExecutionResult(string filePath)
{
List<TestResults> testResults = new List<TestResults>();
XElement xelement = XElement.Load(filePath);
IEnumerable<XElement> results = xelement.Elements().Where(e => e.Name.LocalName == "test");
foreach (var result in results)
{
if (result.Attribute("result").Value == "Fail")
{
testResults.Add(new TestResults(result.Attribute("result").Value, "this is where the failure message would go"));
}
else
{
testResults.Add(new TestResults(result.Attribute("result").Value, ""));
}
}
But I'm having a hard time trying to find and add message inside of failure element in the foreach.
result.Attribute("message").Value

Your code has a couple problems:
The <result> elements are not direct children of the root element, so xelement.Elements().Where(e => e.Name.LocalName == "test") does not select anything. You need to descend deeper into the hierarchy, e.g. with Descendants().
The message text is contained in an indirect child element of the <test> node, specifically failure/message. You need to select this element to get the message.
result.Attribute("message").Value will not work because the XElement.Attribute(XName) method selects an XML attribute rather than an element.
See: XML attribute vs XML element.
Putting those two points together, your code should look like:
private static List<TestResults> GetTestAutomationExecutionResult(string filePath)
=> GetTestAutomationExecutionResult(XElement.Load(filePath));
private static List<TestResults> GetTestAutomationExecutionResult(XElement xelement)
{
var query = from e in xelement.Descendants()
where e.Name.LocalName == "test"
let r = e.Attribute("result").Value
let m = r == "Fail" ? e.Elements("failure").Elements("message").FirstOrDefault()?.Value : ""
select new TestResults(r, m);
return query.ToList();
}
Demo fiddle here.

How to change an attribute in a subnode in C#?

I want to change the attribute value (in this case "51") of the "NextMemberId" in an xml file that looks like this:
<File>
<MemberList>
<NextMemberId Value="51" />
<Member Id="1" ..... />
<Member Id="2" ..... />
</MemberList>
</File>
The following code works, but I would like to know if it can be done in a more direct way without having to run a foreach loop:
var memberId = 1;
var memberlist = Doc.DocumentElement.SelectSingleNode("MemberList");
foreach (XmlNode node in memberlist.ChildNodes)
{
var nodeElement = node as XmlElement;
if (nodeElement != null && nodeElement.Name == "NextMemberId")
{
nodeElement.SetAttribute("Value", memberId.ToString());
}
}
Thanks for any inspiration!

The correct path to get NextMemberId from File according to your sample XML would be :
var nodeElement = Doc.DocumentElement.SelectSingleNode("MemberList/NextMemberId");
nodeElement.SetAttribute("Value", memberId.ToString());
If there are multiple NextMemberId in your actual XML, and you need to filter by Value attribute, then you can add an XPath predicate similar to what the other answer suggested :
var nodeElement = Doc.DocumentElement.SelectSingleNode("MemberList/NextMemberId[#Value=51");
Notice that you can choose to keep or leave single-quotes around 51 depending on whether you want compare the Value as a string or a number, respectively.

You can select single node with specified attribute like this:
var nextMemberIdNode = Doc.DocumentElement.SelectSingleNode("NextMemberId[#Value='51']")

C# - Issues Selecting XML with Linq

I am trying to pull an event description in XML, but I am having trouble accessing the data.
I am trying to access the eventDetailsValue element.
Here is a sample of my code:
(version 1)
XElement doc = XElement.Parse(e.Result);
evtDesc = doc.Element("eventDetails").Element("eventDetails").Element("eventDetailsValue").Element("eventDetailsValue").Value;
(version2)
XElement doc = XElement.Parse(e.Result);
var xGood = from detaildoc in doc.Descendants("eventDetails")
from d in detaildoc.Elements("eventDetail").Elements("eventDetailsValue")
select d;
I have tried the following for a different element and it worked:
GeoLat = Convert.ToDouble(doc.Element("latitude").Value);
Here is a sample of the xml result (i removed the values for simplicity):
<event>
<longitude></longitude>
<latitude></latitude>
<category></category>
<dma></dma>
<activeAdvantage></activeAdvantage>
<seoUrl></seoUrl>
<assetID></assetID>
<eventID></eventID>
<eventDetailsPageUrl></eventDetailsPageUrl>
- <mediaTypes>
<mediaType></mediaType>
<mediaType></mediaType>
<mediaType></mediaType>
<mediaType></mediaType>
<mediaType></mediaType>
</mediaTypes>
<eventContactEmail />
<eventContactPhone />
<eventName></eventName>
<eventDate></eventDate>
<eventLocation></eventLocation>
<eventAddress></eventAddress>
<eventCity></eventCity>
<eventState></eventState>
<eventZip></eventZip>
<eventCountry></eventCountry>
<usatSanctioned></usatSanctioned>
<regOnline></regOnline>
<eventCloseDate></eventCloseDate>
<currencyCode></currencyCode>
<eventTypeID></eventTypeID>
<eventType></eventType>
<hasEventResults></hasEventResults>
<hasMetaResults></hasMetaResults>
<showMap></showMap>
<eventContactEmail />
<eventContactPhone />
<displayCloseDate></displayCloseDate>
<excludedFromEmailing></excludedFromEmailing>
<regOpensMessage />
<regFunnel></regFunnel>
<isValid></isValid>
<displayRegistration></displayRegistration>
- <channels>
- <channel>
<channelName></channelName>
<primaryChannel></primaryChannel>
</channel>
</channels>
- <eventDetails>
- <eventDetail>
<eventDetailsName></eventDetailsName>
<eventDetailsOrder></eventDetailsOrder>
<eventDetailsValue></eventDetailsValue>
</eventDetail>
- <eventDetail>
<eventDetailsName></eventDetailsName>
<eventDetailsOrder></eventDetailsOrder>
<eventDetailsValue></eventDetailsValue>
</eventDetail>
</eventDetails>
<eventDonationLinks />
<eventSanctions />
- <eventCategories>
- <eventCategory>
<categoryID></categoryID>
<categoryGroupCount></categoryGroupCount>
<categoryName></categoryName>
<categoryType></categoryType>
<categoryOrder></categoryOrder>
<numRegistered></numRegistered>
<maxRegistrations></maxRegistrations>
<percentFull></percentFull>
<displayDate></displayDate>
<closeDate></closeDate>
<actualCloseDate></actualCloseDate>
<isExpired></isExpired>
- <priceChanges>
- <priceChange>
<price></price>
<priceUntilDate></priceUntilDate>
</priceChange>
</priceChanges>
</eventCategory>
</eventCategories>
<eventUrl></eventUrl>
<eventContactUrl></eventContactUrl>
<eventImageUrl></eventImageUrl>
</event>
Any help would be appreciated!

The eventDetailsValue is in an array of eventDetail elements. So you need to diferentiate which element in the array you want. With this (and these LinqToXml extensions: http://searisen.com/xmllib/extensions.wiki) you can write it like this:
XElement doc = XElement.Parse(e.Result);
var details = doc.GetEnumerable("eventDetails/eventDetail", x => new
{
Name = x.Get("eventDetailsName", string.Empty),
Order = x.Get("eventDetailsOrder", string.Empty),
Value = x.Get("eventDetailsValue", string.Empty)
});
details is an IEnumerable<object> of Name's, Order's and the Value(s) you want. You can now loop through details and get the value(s) you want. I made Name, Order and Value all be strings, but by calling Get<type>("name", defaultValueByType) you can have them be other types instead.
You can loop through them like this:
foreach(var detail in details)
{
string value = detail.Value;
}
GetEnumerable is shorthand (in this case) for:
doc.Element("eventDetails").Elements("eventDetail").Select(x => new ...)
But it does null checking for you, which if your xml always produces the above xml, there would be no problems to do it long hand. And Get returns the proper value.
Note: Because this is a WindowsPhone7 project, you'll have to set a compiler flag of WindowsPhone7 so that the extensions compile without complaint (hopefully/I haven't tested it).

Try this query:
var xGood = from detaildoc in doc.Descendants("eventDetails")
select new
{
Value = detaildoc.Elements("eventDetail").Elements("eventDetailsValue").Value
};

Linq - getting root descendants

The xml file is this one:
<settings y="1" x="0">
<prospect aksdj="sdf">
<image path="images/1.jpg"/>
</prospect>
<prospect aksdfasdj="safafdf">
<image path="images/2.jpg"/>
</prospect>
</settings>
I want to get both rows with the image tags.
My code is this:
XElement doc = XElement.Load(#"C:\Users\John\Desktop\File.xml");
var result = (from c in doc.Descendants("settings")
select new
{
name = c.Element("prospect").Value
}).ToList();
But, doc.Descendants("settings") is null. Why is it null?

You've loaded an element which is already the <settings> element - that element doesn't have any <settings> descendants. (Descendants isn't returning you null, by the way - it's returning you an empty sequence. There's a big difference.)
If you change it to
XDocument doc = XDocument.Load("...");
then it should be okay - or just load it as an XElement and find the <prospect> descendants, given that you've only got one <settings> element anyway...

Load repetitively-named XML nodes using Linq [C#]

I'm working on a program that needs to be able to load object-properties from an XML file. These properties are configurable by the user and XML makes sense to me to use.
Take the following XML document.
<?xml version="1.0" encoding="utf-8" ?>
<udpcommands>
<command name="requser">
<cvar name="reqchallege" value="false" />
</command>
<command name="reqprocs">
<cvar name="reqchallenge" value="false" />
</command>
</udpcommands>
I need to be able to load values from the cvars above to properties. I'm think Linq-To-XML would be good for it (I'm looking for applications of Linq so I can learn it). I've got a Linq-to-XML query done to select the right "command" based on the name.I was reading MSDN for help on this.
The following code snippet goes in a constructor that takes the parameter "string name" which identifies the correct XML <command> to pull.
I would like to have one linq statement to pull each <cvar> out of that XML given the section name, dumping everything to an IEnumerable. Or, I'm looking for a better option perhaps. I'm open for anything really. I would just like to use Linq so I can learn it better.
XElement doc = XElement.Load("udpcommands.xml");
IEnumerable<XElement> a = from el in doc.Elements()
where el.FirstAttribute.Value == name
select el;
foreach (var c in a)
{
Console.WriteLine(c);
}
The above code snippet outputs the following to the console:
<command name="requser">
<cvar name="reqchallege" value="false" />
</command>

Something like this should do:
var result =
doc.Elements("command")
.Single( x => x.Attribute("name").Value == name)
.Elements("cvar");
This will give you an IEnumerable<XElement> where each XElement represents a cvar in the specified command.
Note that if the specified command does not exist, the call to Single will cause an error. Likewise if the specified attribute is not found on the command.
EDIT As per your comments, you could do something along the lines of:
// Result will be an XElement,
// or null if the command with the specified attribute is not found
var result =
doc.Elements("command")
// Note the extra condition below
.SingleOrDefault( x => x.Attribute("name")!=null && x.Attribute("name").Value == name)
if(result!=null)
{
// results.Elements() gives IEnumerable<XElement>
foreach(var cvar in results.Elements("cvar"))
{
var cvarName = cvar.Attribute("name").Value;
var cvarValue = Convert.ToBoolean( cvar.Attribute("value").Value );
}
}