Reading xml document with several nodes

Question

I have used the following code before but my xml is different this time:

protected string ReturnXmlValue(XmlDocument myXDoc, string field)
{
  var retval = string.Empty;


  try
  {
    var node = myXDoc.GetElementsByTagName(field);
    if (node.Count > 0)
    {
      var xmlNode = node.Item(0);
      if (xmlNode != null)
      {
        retval = xmlNode.InnerText;
      }
    }
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.ToString());
    throw;
  }

  return retval;
}

Here is an example of my xml file dummied down a bit:

<RichDBDS>
  <TrxDetailCard>
    <TRX_HD_Key>18683435</TRX_HD_Key>
    <Date_DT>2015-10-22T21:32:00.233+00:00</Date_DT>
    <TRX_Card_Key>15263569</TRX_Card_Key>
    <Total_Amt_MN>22.0000</Total_Amt_MN>
    <Result_CH>0    </Result_CH>
    <Result_Txt_VC>APPROVED</Result_Txt_VC>
    <Approval_Code_CH>0943253</Approval_Code_CH>
  </TrxDetailCard>
  <TrxDetailCard>
    <TRX_HD_Key>18683825</TRX_HD_Key>
    <Date_DT>2015-10-23T21:32:00.233+00:00</Date_DT>
    <TRX_Card_Key>15263569</TRX_Card_Key>
    <Total_Amt_MN>32.0000</Total_Amt_MN>
    <Result_CH>0    </Result_CH>
    <Result_Txt_VC>APPROVED</Result_Txt_VC>
    <Approval_Code_CH>093389</Approval_Code_CH>
  </TrxDetailCard>
</RichDBDS>

I've not worked with xml much so I'm not sure how to search this for a specific amount. I can have several TrxDetailCards. I know how to get amount when I only have one TrxDetailCard but I need to return the TrxDetailCard for the hits on the amount that I need.

So if I am looking for the TrxDetailCard that is 32.00, I need the method to return:

  <TrxDetailCard>
    <TRX_HD_Key>18683825</TRX_HD_Key>
    <Date_DT>2015-10-23T21:32:00.233+00:00</Date_DT>
    <TRX_Card_Key>15263569</TRX_Card_Key>
    <Total_Amt_MN>32.0000</Total_Amt_MN>
    <Result_CH>0    </Result_CH>
    <Result_Txt_VC>APPROVED</Result_Txt_VC>
    <Approval_Code_CH>093389</Approval_Code_CH>
  </TrxDetailCard>

How would I go about doing this?

Answer 1

Try this

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Xml; using System.Xml.Linq; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { string xml = "<RichDBDS>" + "<TrxDetailCard>" + "<TRX_HD_Key>18683435</TRX_HD_Key>" + "<Date_DT>2015-10-22T21:32:00.233+00:00</Date_DT>" + "<TRX_Card_Key>15263569</TRX_Card_Key>" + "<Total_Amt_MN>22.0000</Total_Amt_MN>" + "<Result_CH>0 </Result_CH>" + "<Result_Txt_VC>APPROVED</Result_Txt_VC>" + "<Approval_Code_CH>0943253</Approval_Code_CH>" + "</TrxDetailCard>" + "<TrxDetailCard>" + "<TRX_HD_Key>18683825</TRX_HD_Key>" + "<Date_DT>2015-10-23T21:32:00.233+00:00</Date_DT>" + "<TRX_Card_Key>15263569</TRX_Card_Key>" + "<Total_Amt_MN>32.0000</Total_Amt_MN>" + "<Result_CH>0 </Result_CH>" + "<Result_Txt_VC>APPROVED</Result_Txt_VC>" + "<Approval_Code_CH>093389</Approval_Code_CH>" + "</TrxDetailCard>" + "</RichDBDS>"; XElement richDBDS = XElement.Parse(xml); XElement results = richDBDS.Elements("TrxDetailCard").Where(x => (decimal)x.Element("Total_Amt_MN") == (decimal)32.0000).FirstOrDefault(); } } }​ 

Answer 2

You can use Linq-to-Xml

var str = File.ReadAllText(@"C:\YourDirectory\sample.xml");
XDocument xDoc = XDocument.Parse(str);

var trxNodes = xDoc.Descendants("TrxDetailCard");
var node = trxNodes.First(n => double.Parse(n.Element("Total_Amt_MN").Value) == 32.00);