How can I check if a string is a number?

Question

I\'d like to know on C# how to check if a string is a number (and just a number).

Example :

141241   Yes
232a23   No
12412a   No

an

Answer 1

Yes there is

int temp;
int.TryParse("141241", out temp) = true
int.TryParse("232a23", out temp) = false
int.TryParse("12412a", out temp) = false

Hope this helps.

Answer 2

You could use something like the following code:

    string numbers = "numbers you want to check";

    Regex regex = new Regex("^[0-9]+$"));

    if (regex.IsMatch(numbers))
    {
        //string value is a number
    }

Answer 3

This is my personal favorite

private static bool IsItOnlyNumbers(string searchString)
{
return !String.IsNullOrEmpty(searchString) && searchString.All(char.IsDigit);
}

Answer 4

If you just want to check if a string is all digits (without being within a particular number range) you can use:

string test = "123";
bool allDigits = test.All(char.IsDigit);

Answer 5

Use int.TryParse():

string input = "141241";
int ouput;
bool result = int.TryParse(input, out output);

result will be true if it was.

Answer 6

int value;
if (int.TryParse("your string", out value))
{
    Console.WriteLine(value);
}