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Question by kimsama · May 18, 2011 at 07:18 AM · converting

Converting string to int or float got FormatException error

The code belows does not work:

int id = System.Convert.ToInt32(result.Attribute("ID").Value);

but the following code works fine:

int id;
int.TryParse(result.Attribute("ID").Value, out id);

Any ideas?

Thank you.

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Answer by CHPedersen · May 18, 2011 at 07:23 AM

That is because there probably isn't a proper value in result.Attribute("ID").Value to make an integer out of, and TryParse swallows the FormatException for you invisibly since you're not handling the boolean it returns, which would've told you whether the conversion succeeded. :)

TryParse must set id, because the method marks that argument with the "out" keyword, but it sets it to 0 if the conversion failed. Is that what you get?

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