Simplified Integer-only Textbox in C#

I looked all over for something to accomplish what should be a very basic task in C#: Allowing only Numeric entry in a text box. Oddly for such an otherwise fantastic development setup, Microsoft provides only the MaskedEdit control, which insists on using a placeholder character (among other limitations). Any other validation has to be manually implemented.

Most of the solutions I found online looked confusing and did way more than I wanted. I found bits and pieces and cobbled together the following function:

public bool IsIntegerEntry(int intKey)
{
//Allow only numeric characters (48-58)
// and control characters (1-31) for copy/backspace/etc.
    return (((intKey >= 48) && (intKey <= 58)) || (intKey < 32))
}

Call it as follows from the KeyPress function of the appropriate TextBox: e.Handled = !IsIntegerEntry(e.KeyChar);

I'm sure there are plenty of gotchas (I'm utterly n00b-tastic when it comes to C#), but it doesn't need to be bulletproof for simple data entry purposes. If they manage to squeeze in a non-integer character in there somewhere, either later validation or database will throw it back regardless.

If you need to validate negative or decimal numbers, be sure to tack an additional "|| (intKey == x)" for the additional ASCII codes at the end of the if statement (45 and 46, respectively). Happy coding!

Comments

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