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Use tryparse if that is possible or have a validation

Nov 22, 2008 Example Codes, Programming

I faced a number of error for parsing a string into int. In most of cases, there is a validation missing.

Code

If (IsNumeric(str))
{
  int i =0;
  Int32.TryParse(str,out i);
}

You can use regex inside IsNumber or use foreach loop to check whether each character is numberic.
BUT NEVER NEVER DO LIKE THIS:

Code

try
{
   int i=  Int32.Parse(i);
}
catch(FormatException)
{
// Error Hanlding
}

Try-catch is an expensive operation!!!!!!!!

Secondly, I like to use TryParse even in the case, the progam can tolrate invalid value. TryParse can allow the logic to continue execution. I hate some things like stack track on the screen.

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