字符串中提取整数与浮点数

  static void Main(string[] args)
        {
            String str = "abc345def";
            int i = getIntValue(str);
            Console.WriteLine(i);

            String str2 = "abc345.678.91def";
            double d = getDoubleValue(str2);
            Console.WriteLine(d);

            Console.ReadKey();
        }
       
        /**
          * 解析str，获得其中的整数
          * @param str
          * @return
          */
        private static int getIntValue(String str)
        {
            int r = 0;
            if (str != null && str.Length != 0)
            {

                StringBuilder bf = new StringBuilder();

                char[] chars = str.ToCharArray();
                for (int i = 0; i < chars.Length; i++)
                {
                    char c = chars[i];
                    if (c >= '0' && c <= '9')
                    {
                        bf.Append(c);
                    }
                    else if (c == ',')
                    {
                        continue;
                    }
                    else
                    {
                        if (bf.Length != 0)
                        {
                            break;
                        }
                    }
                }
                try
                {

                    r = int.Parse(bf.ToString());
                }
                catch (Exception e)
                { }
            }
            return r;
        }

        /**
          * 解析字符串获得双精度型数值，
          * @param str
          * @return
          */
        private static double getDoubleValue(String str)
        {
            double d = 0;

            if (str != null && str.Length != 0)
            {
                StringBuilder bf = new StringBuilder();

                char[] chars = str.ToCharArray();
                for (int i = 0; i < chars.Length; i++)
                {
                    char c = chars[i];
                    if (c >= '0' && c <= '9')
                    {
                        bf.Append(c);
                    }
                    else if (c == '.')
                    {
                        if (bf.Length == 0)
                        {
                            continue;
                        }
                        else if (bf.ToString().IndexOf(".") != -1)
                        {
                            break;
                        }
                        else
                        {
                            bf.Append(c);
                        }
                    }
                    else
                    {
                        if (bf.Length != 0)
                        {
                            break;
                        }
                    }
                }
                try
                {
                    d = Double.Parse(bf.ToString());
                }
                catch (Exception e)
                { }
            }
            return d;
        }
    }