C# determines whether a string can be converted to a number

C# Determine whether a string can be converted into a number

    /// <summary>
        /// 判断字符串是否可以转化为数字
        /// </summary>
        /// <param name="str">要检查的字符串</param>
        /// <returns>true:可以转换为数字；false：不是数字</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 note:

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

        Converts the string representation of a number in the specified style and culture-specific format to its double-precision floating point equivalent. A return value indicating whether the conversion was successful.

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

Parameters:

s:String containing the number to be converted.

style: A bitwise combination of NumberStyles values ​​indicating the allowed formats for s . A typical value used to specify is a combination of Float and AllowThousands.

provider: An IFormatProvider that provides culture-specific formatting information about s.

result: When this method returns, if the conversion succeeds, it contains the double-precision floating point number equivalent to the numerical or symbolic value contained in s; if the conversion fails, contains zero. If the s parameter is a null reference (Nothing in Visual Basic), its format does not conform to style, represents a number less than MinValue or greater than MaxValue, or style is not a valid combination of constants from the NumberStyles enumeration, the conversion fails. This parameter is passed uninitialized.

Return value

If s is converted successfully, it is true; otherwise, it is false.

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