What’s the main difference between int.Parse() and Convert.ToInt32
- If you’ve got a string, and you expect it to always be an integer (say, if some web service is handing you an integer in string format), you’d use
Int32.Parse()
. - If you’re collecting input from a user, you’d generally use
Int32.TryParse()
, since it allows you more fine-grained control over the situation when the user enters invalid input. Convert.ToInt32()
takes an object as its argument. (See Chris S’s answer for how it works)Convert.ToInt32()
also does not throwArgumentNullException
when its argument is null the wayInt32.Parse()
does. That also means thatConvert.ToInt32()
is probably a wee bit slower thanInt32.Parse()
, though in practice, unless you’re doing a very large number of iterations in a loop, you’ll never notice it.