How to write this nested Linq To Xml query
Question
Hi I am writing an app for a medical study they will type in the gender, the age, and some other values which will be calculated to a ResultValue
now I have an XML file which holds some information about the result in combination of Age, Gender and the ResultValues and I would like to print out the description of the TestResult (in case in which group the proband belong) One thing to note is that I have to deal with value ranges this means the actual value lies between the low part and the high part... I have three groups... OK hier is my XML file
<?xml version="1.0" encoding="iso-8859-1"?>
<Result>
<ID>1</ID>
<Description>You belong to Group 1</Description>
<Genders>
<Gender type="female">
<Ages>
<Age low="18" high="24">
<ResultValue low="0" high="19"/>
</Age>
<Age low="25" high="34">
<ResultValue low="0" high="20"/>
</Age>
<Age low="35" high="44">
<ResultValue low="0" high="21"/>
</Age>
<Age low="45" high="54">
<ResultValue low="0" high="22"/>
</Age>
<Age low="55" high="64">
<ResultValue low="0" high="23"/>
</Age>
<Age low="65" high="110">
<ResultValue low="0" high="24"/>
</Age>
</Ages>
</Gender>
<Gender type="male">
<Ages>
<Age low="18" high="24">
<ResultValue low="0" high="19"/>
</Age>
<Age low="25" high="34">
<ResultValue low="0" high="20"/>
</Age>
<Age low="35" high="44">
<ResultValue low="0" high="21"/>
</Age>
<Age low="45" high="54">
<ResultValue low="0" high="22"/>
</Age>
<Age low="55" high="64">
<ResultValue low="0" high="23"/>
</Age>
<Age low="65" high="110">
<ResultValue low="0" high="24"/>
</Age>
</Ages>
</Gender>
</Genders>
</Result>
<Result>
<ID>2</ID>
<Description>You belong to Group 2</Description>
<Genders>
<Gender type="female">
<Ages>
<Age low="18" high="24">
<ResultValue low="19" high="24"/>
</Age>
<Age low="25" high="34">
<ResultValue low="20" high="25"/>
</Age>
<Age low="35" high="44">
<ResultValue low="21" high="26"/>
</Age>
<Age low="45" high="54">
<ResultValue low="22" high="27"/>
</Age>
<Age low="55" high="64">
<ResultValue low="23" high="28"/>
</Age>
<Age low="65" high="110">
<ResultValue low="24" high="29"/>
</Age>
</Ages>
</Gender>
<Gender type="male">
<Ages>
<Age low="18" high="24">
<ResultValue low="19" high="24"/>
</Age>
<Age low="25" high="34">
<ResultValue low="20" high="25"/>
</Age>
<Age low="35" high="44">
<ResultValue low="21" high="26"/>
</Age>
<Age low="45" high="54">
<ResultValue low="22" high="27"/>
</Age>
<Age low="55" high="64">
<ResultValue low="23" high="28"/>
</Age>
<Age low="65" high="110">
<ResultValue low="24" high="29"/>
</Age>
</Ages>
</Gender>
</Genders>
</Result>
<Result>
<ID>3</ID>
<Description>You belong to group 3</Description>
<Genders>
<Gender type="female">
<Ages>
<Age low="18" high="24">
<ResultValue low="24" high="29"/>
</Age>
<Age low="25" high="34">
<ResultValue low="25" high="30"/>
</Age>
<Age low="35" high="44">
<ResultValue low="26" high="31"/>
</Age>
<Age low="45" high="54">
<ResultValue low="27" high="32"/>
</Age>
<Age low="55" high="64">
<ResultValue low="28" high="33"/>
</Age>
<Age low="65" high="110">
<ResultValue low="29" high="34"/>
</Age>
</Ages>
</Gender>
<Gender type="male">
<Ages>
<Age low="18" high="24">
<ResultValue low="24" high="29"/>
</Age>
<Age low="25" high="34">
<ResultValue low="25" high="30"/>
</Age>
<Age low="35" high="44">
<ResultValue low="26" high="31"/>
</Age>
<Age low="45" high="54">
<ResultValue low="27" high="32"/>
</Age>
<Age low="55" high="64">
<ResultValue low="28" high="33"/>
</Age>
<Age low="65" high="110">
<ResultValue low="29" high="34"/>
</Age>
</Ages>
</Gender>
</Genders>
</Result>
What would look my linq to xml query like if I have
gender="female"
age=29
ResultValue=17
this proband would certainly belong to Group 1 and I would like to print out the matching Description...
But I am banging my head to get this working...
I am looking for a solution in c#... Any help would be great!!!
1 answers
solution1
6 ACCPTED 2009-01-08 17:52:51
Something like this?
XElement myElement = XElement.Parse(xmlstring);
int resultValue = 17;
int age = 26;
string genderValue = "female";
IEnumerable<string> query =
myElement.Descendants("ResultValue")
.Where(rv => ((int)rv.Attribute("low")) <= resultValue)
.Where(rv => ((int)rv.Attribute("high")) >= resultValue)
.Where(rv => rv.Ancestors("Age")
.Any(a => ((int) a.Attribute("low")) <= age && ((int) a.Attribute("high")) >= age)
)
.Where(rv => ((string)rv.Ancestors("Gender").Single().Attribute("type")) == genderValue)
.Select(rv => rv.Ancestors("Result").Single().Element("Description").Value);
foreach (string x in query)
Console.WriteLine(x);
The idea is that you can imagine a row-column shape where each row is a ResultValue. Each result value has a single parent of Age, a single parent of Gender, an a single parent of Result.
ResultValue.Low ResultValue.High Age.Low Age.High Gender.Type Result.Description
In fact, one can project the above xml into that shape:
var query2 = myElement.Descendants("ResultValue")
.Select(rv => new
{
ResultValue = rv,
Age = rv.Ancestors("Age"),
Gender = rv.Ancestors("Gender"),
Result = rv.Ancestors("Result")
})
.Select(x => new XElement("Data",
new XAttribute("ResultValue.Low", (int)x.ResultValue.Attribute("low")),
new XAttribute("ResultValue.High", (int)x.ResultValue.Attribute("high")),
new XAttribute("Age.Low", (int)x.Age.Attributes("low").Single()),
new XAttribute("Age.High", (int)x.Age.Attributes("high").Single()),
new XAttribute("Gender.Type", (string) x.Gender.Attributes("type").Single()),
new XAttribute("Result.Description", (string) x.Result.Elements("Description").Single())
));
foreach (XElement x in query2)
Console.WriteLine(x);
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