Check sum total on an element-CodePudding

I am trying to get the checksum total of an XML file as seen below:

<?xml version="1.0"?>

<student_update date="2022-04-19" program="CA" checksum="20021682">
    <transaction>
        <program>CA</program>
        <student_no>10010823</student_no>
        <course_no>*</course_no>
        <registration_no>216</registration_no>
        <type>2</type>
        <grade>90.4</grade>
        <notes>Update Grade Test</notes>
    </transaction>
    <transaction>
        <program>CA</program>
        <student_no>10010859</student_no>
        <course_no>M-50032</course_no>
        <registration_no>*</registration_no>
        <type>1</type>
        <grade>*</grade>
        <notes>Register Course Test</notes>
    </transaction>
</student_update>

I am wondering if I am going about this the right way.. please let me know:

XDocument xDocument = XDocument.Load(inputFileName);
XElement root = xDocument.Element("student_update");
IEnumerable<XElement> studentnoElement = xDocument.Descendants().Where(x => x.Name == "student_no");
int checksum = studentnoElement.Sum(x => Int32.Parse(x.Value));
if (!root.Attribute("checksum").Value.Equals(checksum))
{
  throw new Exception(String.Format("Incorrect checksum total "   "for file {0}\n", inputFileName));
}

I am running into some errors with the exception not popping up as expected, I am looking for some advice on how to correct this. Thank you!

CodePudding user response：

From the root element of the checksum attribute, you are getting the value with the string type.

You can check with:

Console.WriteLine(root.Attribute("checksum").Value.GetType());

You have to convert to Integer first before comparing both values.

int rootCheckSum = Convert.ToInt32(root.Attribute("checksum").Value);
if (!rootCheckSum.Equals(checksum))
{
    throw new Exception(String.Format("Incorrect checksum total "   "for file {0}\n", inputFileName));
}

Or prefer safely convert to Integer with Int32.TryParse()

int rootCheckSum = Convert.ToInt32(root.Attribute("checksum").Value);
bool isInteger = Int32.TryParse(root.Attribute("checksum").Value, out int rootCheckSum);
if (!isInteger)
{
    // Handle non-integer case
}

if (!rootCheckSum.Equals(checksum))
{
    throw new Exception(String.Format("Incorrect checksum total "   "for file {0}\n", inputFileName));
}

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