判断字符串是否为数字（Judge whether the string is a number），用正则表达式

  /// <summary>
    /// Judge whether the string is a number
    /// </summary>
    /// <param name="message"></param>
    /// <param name="result"></param>
    /// <returns></returns>

protected bool isNumber(string message, out int result)
{
System.Text.RegularExpressions.Regex rex =
new System.Text.RegularExpressions.Regex(@“^\d+$”);
result = -1;
if (rex.IsMatch(message))
{
result = int.Parse(message);
return true;
}
else
return false;
}