In this pos I will show some intersting XLing examples used to query the data in the Visual Studio project file. Samples in this document are based on XML file shown in this post
and are all preceeded with following code, which loads the root element from XML file and set the namespace member to default namespace of document.
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XElement solutionXml = XElement.Load(projectFile);
XNamespace m_Namespace = solutionXml.GetDefaultNamespace(); |
Sample I: Element with specific subelement
Retrieve all ItemGroup elements which contain at least one element Compile.
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var compilingItemGroup =
from element in solutionXml.Elements(m_Namespace + "ItemGroup")
where element.Elements(m_Namespace + "Compile").Count() > 0
select element; |
Sample II-a: Subelements with specific attribut value
Retrieve all Compile elements which contains Include Attribute with value "Hello.cs"
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var compilingFiles =
from element in solutionXml.Elements(m_Namespace + "ItemGroup").
Elements(m_Namespace + "Compile")
where element.Attribute("Include") != null &&
element.Attribute("Include").Value.IndexOf("Hello.cs") > -1
select element; |
Sample II-b: Subelements with specific attribute value and
using of filter function
Retrieve all Compile elements which contains Include Attribute with value "Hello.cs", but with using of filter function.
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private bool filter(XElement x, string val)
{
//Func<XElement, bool> f1 = x => filter;
return x.Attribute("Include") != null &&
x.Attribute("Include").Value.IndexOf(val) > 1;
}
var compilingFiles =
from element in
solutionXml.Elements(m_Namespace + "ItemGroup").
Elements(m_Namespace + "Compile")
where filter(element, process)
select element; |
Sample III-a: Nested query
Retrieve all ItemGroup elements which contains Content elements with Include attribute set on value "Dummy.aspx".
This example demonstrates usage of nested queries.
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var contentItemGroup = from element in
solutionXml.Elements(m_Namespace + "ItemGroup
where
(from contentEl in element.Elements(m_Namespace + "Content")
where contentEl.Attribute("Include") != null &&
contentEl.Attribute("Include").Value.Contains("Dummy.aspx")
select contentEl).Count() > 0
select element; |
Sample III-a: Embedding of nested query in filter function
Retrieve all ItemGroup elements which contains Content elements with Include attribute set on value "Dummy.aspx".
This example demonstrates usage of filter function instead of nested queries. It is more usable for debugging.
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var contentItemGroup = from element in
solutionXml.Elements(m_Namespace + "ItemGroup
where filter(element, "Dummy.aspx")
select element;
private bool filter(XElement x, string specificAttributeValue)
{
var contentEls =
from contentEl in x.Elements(m_Namespace + "Content")
where contentEl.Attribute("Include") != null &&
contentEl.Attribute("Include").Value.Contains(specificAttributeValue)
select contentEl;
return contentEls.Count() > 0;
} |
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Posted
Dec 13 2007, 09:36 PM
by
Damir Dobric