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C# IsNumeric Method equivalent to VB

0 votes
asked Jun 11, 2013 in C#.NET by anonymous
edited Jun 11, 2013

What is the equivalent method in C# for IsNumeric Validation method which we have in VB. If there is no such a method, what would be the best way to implment that?


1 Answer

+1 vote
answered Jun 11, 2013 by Aadhira (1,215 points)
selected Jun 11, 2013 by administrator
Best answer

I don't think we have any exact matching method for IsNumeric in C#. Also, I am not sure whether the below method is the perfect solution, but it works for me so good so far in my applications.
I have included some condition to check NaN, Infinity, because TryParse of Double will return true if the string is "Nan" or "Infinity". But In my case, it is not a valid numeric. So, I am validating that as well.

public class IsNumericValidation
        public static bool IsNumeric(string anyString)
            bool isNumeric = false;
            Double outValue;
            isNumeric = Double.TryParse(anyString, out outValue);
            if (isNumeric)
                isNumeric = !(Double.IsNaN(outValue) ||
                                Double.IsInfinity(outValue) ||
                                Double.IsPositiveInfinity(outValue) ||
            return isNumeric;

I test with the below values and the result was same as I expect for my scenario.

static void Main(string[] args)
            Console.WriteLine(IsNumericValidation.IsNumeric("any string"));

Result for first 3 values are False and rest all true.

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