(.NET Core C#) Find XML Element where Attribute = Value

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Finds an XML element at a particular location where an attribute has a specified value.

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// We have the following XML and wish to find the value of the time attribute where msg = "alert-from".

// <cdr id="4e5d3e7f41bf6201ad81000c29703270" e164="6207">
//     <user>
//         <grp name="wfln" mode="active"/>
//     </user>
//     <event msg="setup-to" time="287069" e164="5034"/>
//     <event msg="alert-from" time="287069" e164="5034"/>
//     <event msg="rel-to" time="287079" e164="5034"/>
// </cdr>

bool success;

// First, build the above XML:

Chilkat.Xml xml = new Chilkat.Xml();
xml.Tag = "cdr";
xml.AddAttribute("id","4e5d3e7f41bf6201ad81000c29703270");
xml.AddAttribute("e164","6207");
xml.UpdateAttrAt("user|grp",true,"name","wfln");
xml.UpdateAttrAt("user|grp",true,"mode","active");
xml.UpdateAttrAt("event",true,"msg","setup-to");
xml.UpdateAttrAt("event",true,"time","287069");
xml.UpdateAttrAt("event",true,"e164","5034");
xml.UpdateAttrAt("event[1]",true,"msg","alert-from");
xml.UpdateAttrAt("event[1]",true,"time","287069");
xml.UpdateAttrAt("event[1]",true,"e164","5034");
xml.UpdateAttrAt("event[2]",true,"msg","rel-to");
xml.UpdateAttrAt("event[2]",true,"time","287079");
xml.UpdateAttrAt("event[2]",true,"e164","5034");

// Show that we have the above XML
Debug.WriteLine(xml.GetXml());

// Find the element where msg = "alert-from"
// This updates the xml object's reference to the found element (if successful).
string notUsed = xml.ChilkatPath("/A/event,msg,alert-from|$");
if (xml.LastMethodSuccess == false) {
    Debug.WriteLine("Not found.");
    return;
}

// Get the value of the "time" attribute.
Debug.WriteLine("time = " + xml.GetAttrValue("time"));

// Restore the xml object's internal reference to the root of the XML document
xml.GetRoot2();