Tuesday, August 12, 2008

IsNumeric Function in C#

VB.NET has lots of functions that C# developers have to create manually.

Out of which I am providing here the different alternatives of IsNumeric function of VB.NET in C#

Using Parse

static bool IsNumeric(string s)

{

    try

    {

        Int32.Parse(s);

    }

    catch

    {

        return false;

    }

    return true;

}

Using Double.TryParse

(C# 2.0 and above)

static bool IsNumeric(object expression)

{

    if (expression == null)

        return false;

    double number;

    return Double.TryParse(Convert.ToString(expression,   CultureInfo.InvariantCulture),

        System.Globalization.NumberStyles.Any, NumberFormatInfo.InvariantInfo, out number);

}

Using Regular Expression

bool IsNumeric(string value)

{

    Regex regxNumericPatters = new Regex("[^0-9]");

    return !regxNumericPatters.IsMatch(value);

}

OR

static bool IsNumeric(string inputString)

{

    return Regex.IsMatch(inputString, "^[0-9]+$");

}

Using Char

static bool IsNumeric(string numberString)

{

    foreach (char c in numberString)

    {

        if (!char.IsNumber(c))

        return false;

    }

    return true;

}

I hope this will help you, if you have more ideas then do write comments.

1 comments:

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