How to query an XML file using LINQ to XML

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I am trying to extract all conditional compilation constsants from a given project file. The file has several PropertyGroup elements like this:

XML

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
	<DebugSymbols>true</DebugSymbols>
	<DebugType>full</DebugType>
	<Optimize>false</Optimize>
	<OutputPath>bin\Debug\</OutputPath>
	<DefineConstants>DEBUG;TRACE</DefineConstants>
	<ErrorReport>prompt</ErrorReport>
	<WarningLevel>4</WarningLevel>
</PropertyGroup>

My first attempts at Linq to Sql all gave me all nodes, or none. What queries can I run to:

(a) get all DefineConstants elements, but include their parent element in the query, because I need the Condition attribute, or
(b) get all PropertyGroup elements that have DefineConstants children and include this children.

I am trying to build a dictionary of conditional compilation constants, so next time you come across a constant like DEVIL_FROG_POTATO_GREEN, you can just pop open my dictionary window and read, or hopefully, write what it does for others.

Posted 26-Jan-15 16:25pm

Brady Kelly

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Manoj Kumar Choubey · Answer 1 · 2015-01-26T18:42:00

For Linq to xml you need to add following name space
1. System.Xml
2. System.Xml.Linq

we have number of option to query desired node from the xml ( paranet node and child node )
Please check on following links for the same

https://msdn.microsoft.com/en-us/library/bb943906.aspx[^]

http://www.dotnetcurry.com/showarticle.aspx?ID=564[^]

Parse XML Documents by XMLDocument and XDocument[^]

Parse XML Documents by XMLDocument and XDocument[^]

LINQ to XML[^]

http://codesamplez.com/programming/linq-to-xml-tutorial[^]

John C Rayan · Answer 2 · 2015-01-27T09:03:00

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace LinqToXml
{
class Program
{
static void Main(string[] args)
{
string proj = @"<?xml version=""1.0""?>
<Project>
<PropertyGroup Condition="" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition="" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
</Project>";

XElement projElement = XElement.Parse(proj);
IEnumerable<XElement> constants = from x in projElement.Elements("PropertyGroup")
where x.Descendants("DefineConstants").Count() > 0
select x;
Console.WriteLine(string.Join(", ", constants.Select(x => x)));

}
}
}

How to query an XML file using LINQ to XML

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