CODEWITHSUNDEEP
c#xml-parsing
Developer
Developer

Reputation: 8636

Simpler way to parse XML

I have the following xml which is returning from an api:

<?xml version="1.0" encoding="utf-8"?>
  <response>
   <error>
    <errorcode>1002</errorcode>
    <errortext>there is already an open session</errortext>
   </error>
</response>

I would like to read the error code. I write up the following code:

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(result1);
XmlNode node = xmlDoc.DocumentElement.SelectSingleNode("/response").ChildNodes[0].ChildNodes[0].InnerText

Is there any other way of doing this by using linq or some other technique?

I am using an api to call as follows

HttpClientHandler handler = new HttpClientHandler();
HttpClient client = new HttpClient(handler);
var result = client.GetAsync(new Uri("https://api/access.mth?username=xyz&password=xyz@2021)).GetAwaiter().GetResult();
StreamReader reader = new StreamReader(result.Content.ReadAsStringAsync().Result);

Upvotes: 0

Views: 2809

Answers (1)

SomeBody
SomeBody

Reputation: 8743

You can use the XML serializer which is located in the namespace System.Xml.Serialization. Create a class with a paramterless constructor that has public properties with getters and setters according to your XML elements:

public class response
{
   public error error {get;set;}
}

public class error
{
   public int errorcode {get;set;}
   public string errortext {get;set;}
}

Note: the parameterless constructor is created here implicitly by the compiler, because no constructor is defined at all.

You can load the file via

using StreamReader reader = new StreamReader("file.xml");
XmlSerializer serializer = new XmlSerializer(typeof(response));
var result = (response)serializer.Deserialize(reader);
int errorCode = result.error.errorcode;

You have some flexibility regarding the format of the XML file. For example if you have also this file to parse:

<response>
<returncode>
   <code>100</code>
   <description>successful</description>
</returncode> <authkey>xxxx<authkey>
</response>

You can modify your class structure:

public class response
{
   public error error {get;set;}
   public returncode returncode {get;set;}
   public string authkey {get;set;}
}

public class error
{
   public int errorcode {get;set;}
   public string errortext {get;set;}
}

public class returncode
{
   public int code {get;set;}
   public string description {get;set;}
}

If you parse a file of first format, returncode and authkey will be null. If you parse a file of second format, error will be null.

Upvotes: 3

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