C # Determines if a string can be converted to a number

C # Determines if a string can be converted to a number

    <summary>///        determine if the string can be converted to digital///</summary>//        <param name= "str" > the string to check </ param>//        <returns>true: Can be converted to a number; false: not a number </returns> public        static bool Isnumberic (string STR)        {            double vsnum;            BOOL Isnum;            Isnum = Double. TryParse (str, System.Globalization.NumberStyles.Float,                System.Globalization.NumberFormatInfo.InvariantInfo , out vsnum);            return isnum;        }

Small bet

Double.tryparse method (String, NumberStyles, IFormatProvider, Double)

converts the string representation of a number in a specified style and culture-specific format to its double-precision floating-point count equivalent. A return value that indicates whether the conversion succeeded.

public static bool TryParse (    string s,    NumberStyles style,    IFormatProvider provider, out    double result )

Parameters:

S: A String containing the number to convert.

style:A bitwise combination of the NumberStyles values that indicates the format that s is allowed to use. A typical value that is used to specify a combination of Float and allowthousands.

provider: A IFormatProvider that provides culture-specific formatting information about S.

result: When this method returns, contains a double-precision floating-point number equivalent to the numeric value or symbol contained in S if the conversion succeeds, or 0 if the conversion fails. If the s parameter is a null reference (Nothing in Visual Basic), its format does not conform to style, the number represented is less than MinValue or greater than MaxValue, or the style is not a valid combination of constants of the NumberStyles enumeration, the conversion fails 。 The parameter is passed without initialization.

return value

True if S is successfully converted; otherwise false.

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