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

I'm not a programmer of particularly high skills, but when I needed to solve this, I chose what is probably a very non-elegant solution, but it suits my needs.

    private bool IsValidNumber(string _checkString, string _checkType)
    {
        float _checkF;
        int _checkI;
        bool _result = false;

        switch (_checkType)
        {
            case "int":
                _result = int.TryParse(_checkString, out _checkI);
                break;
            case "float":
                _result = Single.TryParse(_checkString, out _checkF);
                break;
        }
        return _result;

    }

I simply call this with something like:

if (IsValidNumber("1.2", "float")) etc...

It means that I can get a simple true/false answer back during If... Then comparisons, and that was the important factor for me. If I need to check for other types, then I add a variable, and a case statement as required.