LINQ to XML HELP PLEASE: Reading Parameter Attributes from XML string

Question

Hello everyone,
This is my first time to learn LINQ and I need to be able to query data quickly and store the information in an object. Not sure which thread to post this to, but I think C-Sharp Programming should be the correct thread.

Anyway, I have the following string :

 

theString = @" 

<MgmtSystemInfo> 
<LocalFixeDisk> 
<Disks Drive="C:"> 

<Param Description="Local Fixed Disk" TimeStamp="4/26/2010 2:20:11 AM" 
/> 
<Param Compressed="No" TimeStamp="4/26/2010 2:20:11 AM" /> 

<Param FileSystem="NTFS" TimeStamp="4/26/2010 2:20:11 AM" /> 

<Param TotalSpace="149.05GB (160039239680bytes)" TimeStamp="4/26/2010 
2:20:11 AM" /> 
<Param AvailableSpace="140.47GB (150827999232bytes)" 
TimeStamp="4/26/2010 2:20:11 AM" /> 
<Param 
PercentageAvaliable="94.24%" TimeStamp="4/26/2010 2:20:11 AM" /> 

<Param VolumeName="OS" TimeStamp="4/26/2010 2:20:11 AM" /> 

<Param VolumeSerialNumber="9C3F9B31" TimeStamp="4/26/2010 2:20:11 AM" 
/> 
</Disks> 
</LocalFixeDisk> 
<SystemInfo> 

<Param OSName="Microsoft Windows XP Professional" TimeStamp="4/26/2010 
2:20:11 AM" /> 
<Param Version="5.1.2600 Service Pck 2 Build 2600" 
TimeStamps="4/26/2010 2:20:11 AM" /> 
<Param OSManufacturer="Microsoft 
Corporation" TimeStamps="4/26/2010 2:20:11 AM" /> 
<Param SN=" 1234567" 
TimeStamps="4/26/2010 2:20:11 AM" / 
<Param WindowsDirectory="C:\WINDOWS" 
TimeStamps="4/26/2010 2:20:11 AM" /> 
</SystemInfo> 

<MgmtSystemInfo>" 

 
I need to be able to read each Param attribute from say, the <Disks> </Disks> section of this XML string.

For instance, i want to be able to read the Description attribute in this section of the above XML :


 

 <Param Description="Local Fixed Disk" TimeStamp="4/26/2010 2:20:11 AM" /> 

 
and then programatically read the rest of the attributes in each PARAM section, say, the Compressed and FileSystem attributes, etc.

 

 <Param Compressed="No" TimeStamp="4/26/2010 2:20:11 AM" /> 
<Param 
FileSystem="NTFS" TimeStamp="4/26/2010 2:20:11 AM" /> 

 
and so on...

How do I do this ?
I tried this snippet as an example but it does not work ( I get an exception when I added the commented out lines below )

 

 

class Param 
{ 
 public string Description { get; set; } 
 public string Compressed { get; set; } 
 public string FileSystem { get; set; } 
 public string TotalSpace { get; set; } 
 public string AvailableSpace { get; set; } 
 public string PercentageAvailable { get; set; } 
 public string Volumename { get; set; } 
 public string VolumeSerialNum { get; set; } 

}; 

public class DiskDrives 
{ 
   public string Drive { get; set; } 
} 


XDocument xdoc = Xdocument.Parse(theString); 

List<DiskDrives> LocalDisks = 
(from drives in 

xdoc.Descendants("Disks")
select new DiskDrives
{
Drive = drives.Attribute("Drive").Value,
}).ToList<DiskDrives>();
 
foreach (var drives in LocalDisks)
{
Console.WriteLine("Drive: " + drives.Drive.ToString());
var Parameters = from theparam in xdoc.Descendants("Disks")
where (theparam.Attribute("Drive").Value == drives.Drive)
select new Param
{
Description = theparam.Element("Param").Attribute("Description").Value,
// Note, I had to comment the next two lines out as they were causing // exceptions.
// My intent is to capture the rest of the attributes in the // above XML string
// Compressed = theparam.Element("Param").Attribute("Compressed").Value,
//FileSystem = theparam.Element("Param").Attribute("FileSystem").Value,
};

foreach (var item in Parameters)
{
  Console.WriteLine("Item: " + item.Description); // I get the correct value here "Local Fixed Disk"
    Console.WriteLine("Item: " + item.Compressed); // The value should be "No"
    Console.WriteLine("Item: " + item.FileSystem); // The value should be "NTFS"
}
}

 
In the above code, the commented out lines cause exceptions.

I am able to get the Description attribute of the first <PARAM />
section, but do not know how I can get the other attributes programatically ( e.g., the Compressed and FileSystem attributes ).

Your help/advise regarding this matter will be highly appreciated.