How to determine if a string can be converted to a number in C #

<summary>  
///Determines whether strings can be converted to digital  
///</summary>  
///<param name= "str" > the string to check </ Param>  
///<returns>true: can be converted to numbers; false: not digital </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;  
}

Note

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 numbers 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.

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

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

Result: If the conversion succeeds when this method returns, contains a double-precision floating-point number equivalent to the value or symbol contained in s; If the conversion fails, it contains 0. 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 the MaxValue, or the style is not a valid combination of constants of the NumberStyles enumeration, the conversion fails 。 This parameter is passed without initialization.

return value

True if S is successfully converted, or false.