Question

The following line:

string cellData = d.XPathSelectElement(cellSelector).Value;

Throws an exception stating “The XPath expression evaluated to unexpected type System.Double.”

The CellSelector contains: “./Units * ./product/Cost”

The Data in XElement d is:

<LineItem>
  <product>
    <ProductId>22</ProductId>
    <ProductName>Car Cleaning</ProductName>
    <Cost>26.02</Cost>
  </product>
  <Units>2</Units>
</LineItem>

In this example, I need the output of that line to be “52.04” and even more ideally, I’d love it to be “£ 52.04”.

What would the XPathExpression have to look like to accomplish that?

I tried changing the expression to “String(./Units * ./product/Cost)” but that generates the exception “The XPath expression evaluated to unexpected type System.String.” which I would expect to have worked.

Answer 1

XPathEvaluate seems to be what you want:

var cellData = xml.XPathEvaluate("./Units * ./product/Cost");
cellData = string.Format("£ {0}", cellData);
// result: cellData == "£ 52,04"