CODEWITHSUNDEEP
c#asp.netxmlxml-parsing
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trx

Reputation: 2157

How to check if the element is present while parsing

I have an XDocument new_doc which has the following XML like 

<lab:lab uri="https://bh03.org/api/lb/3" xmlns:udf="http://ge.com/ri/userdefined" xmlns:ri="http://ge.com/ri" xmlns:lab="http://ge.com/ri/lab">
<name>GTech</name>
<udf:field type="String" name="Account ID">gt</udf:field>
</lab:lab>

With the below code I am trying to get the Value for Account ID

   XNamespace ns = "http://ge.com/ri/userdefined";
   accountID = new_doc.Descendants(ns + "field").FirstOrDefault(field => field.Attribute("name").Value.Equals("Account ID")).Value;

But how do I check if the <udf:field type="String" name="Account ID">gt</udf:field> is present before getting the value for the Account ID. Because sometimes the XML might be something like below

  <lab:lab uri="https://bh03.org/api/lb/3" xmlns:udf="http://ge.com/ri/userdefined" xmlns:ri="http://ge.com/ri" xmlns:lab="http://ge.com/ri/lab">
  <name>GTech</name>
  </lab:lab>

Upvotes: 1

Views: 48

Answers (1)

L.B
L.B

Reputation: 116168

You can use XPath and check if field is null or not..

var nsmgr = new XmlNamespaceManager(new NameTable());
nsmgr.AddNamespace("udf", "http://ge.com/ri/userdefined");
var xDoc = XDocument.Load(filename);  

var field = xDoc.XPathSelectElement("//udf:field[@name]", nsmgr);
if(field != null)
{
    var name = field.Attribute("name");
}

PS: In fact //udf:field is enough. //udf:field[@name] checks also the existence of name attribute. A more restricted version of it can be //udf:field[@name='Account ID']

Upvotes: 1

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