How to convert empty string in int32?

c# html-agility-pack

Question

I'm developing software that grabs data from an html table. So this line:

team.SelectSingleNode(".//td[@class='number total won total_won']")?.InnerText.Trim();

returns: ""

(I'm using html agility pack for DOM manipulation.)

And the complete line is this:

Convert.ToInt32(
  team.SelectSingleNode(
    ".//td[@class='number total won total_won']")
  ?.InnerText.Trim());

This returns an exception (incorrect format exception).

Any idea to solve this?

Accepted Answer

You can use int.TryParse instead of Convert.ToInt32

int myInt;
if(!int.TryParse(team.SelectSingleNode(".//td[@class='number total won total_won']")?.InnerText.Trim(), out myInt))
{
  myInt = 0;
}

I know, but I've 30+ lines of code, so I should add a lot of if conditions... – Ilnumerouno just now

You can write a helper method instead.

public static class Converter{
    public static int ConvertToInt(string stringAsInt){
      int myInt;
      return int.TryParse(stringAsInt, out myInt) ? myInt : 0;
    }
}

Calling code.

var parsedInt = Converter.ConvertToInt(team.SelectSingleNode(".//td[@class='number total won total_won']")?.InnerText.Trim());



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Licensed under: CC-BY-SA with attribution
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Is this KB legal? Yes, learn why