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c#xmlxmldocument

How to use GetElementsByTagName on a Tag That Is Insıde a Spesific Tag XMLDocument C#

I need to read an Xml file and I am trying to count the numbers of a spesific tag inside the file. My problem is the same tag represents different things when it is outside some other tag and inside. I am able to get total count of the tag but I need to find the count of the tag that is inside the specified tag.

(I find total cac:AllowanceCharge tags by using XmlNodeList nodeList = xmlDoc.DocumentElement.GetElementsByTagName("cac:AllowanceCharge");)

To Find the "cac:AllowanceCharge" tags that are inside the "cac:InvoiceLine" tags i have tried using:

XmlNodeList elemList = root.GetElementsByTagName(@"//cac:InvoiceLine/cac:AllowanceCharge");

XmlNodeList elemList = root.GetElementsByTagName(@"//InvoiceLine/AllowanceCharge");

XmlNodeList elemList = root.GetElementsByTagName(@"cac:InvoiceLine/cac:AllowanceCharge");

I would appreciate it if someone could tell me the right syntax for it. Thank you.

Solution

  • The first looks correct, if you registered namespace binding cac

    //cac:InvoiceLine/cac:AllowanceCharge

    There is also another way

    //*[name()='InvoiceLine']/*[name()='AllowanceCharge']

    To select the nodes by XPath, call the SelectNodes method:

    var root = xmlDoc.DocumentElement;
var nodeList = root.SelectNodes(xpath);

    or the overloaded method

    var nodeList2 = root.SelectNodes(xpath, namespaceManager);