In WinForm I need to check if the value in the TextBox is a number or not.
In PHP there is is_numeric function. Is something similar available in .NET?
4 Answers
I'd use TryParse to check
string str = "123";
int i;
if (int.TryParse(str, out i))
{
// it's an int
}
you should be able to do similar with other types, such as double
answered Apr 29, 2013 at 21:04
Sam I am says Reinstate Monica
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1 Comment
JDB
If you check the documentation for PHP's
is_numeric, you'll find that "0x4a", "7.9" and "+1.2e3" should also return true.int val;
bool parsed = Int32.TryParse(input_str, out val);
Gives you both if it's a valid int and the result of parsing it as int as well (in val)
Comments
int number;
string str="!23";
if(int.TryParse(str, out number))
{
//do something
}
if you are 100% sure its an int you can use:
int.Parse(str);
or
Convert.ToInt32(str);
it will cast an execption if its not an int
Comments
double.tryparse will allow you to check the string.
is_numeric. The linked answer does not provide some of the more advanced capabilities requested.is_numeric. See stackoverflow.com/a/16303109/211627 (Even if the OP is satisfied with the linked question/answer, replicatingis_numericis still an interesting challenge)