中文计数

了业务的需要无聊之极的写了一个输出中文数字的方法，效率上勉强过得去，如果你有什么更好的方法，跟贴吧。

 1
 2        /**//// <summary>
 3        /// 中文计数
 4        /// </summary>
 5        /// <param name="num">[1 - 99999]</param>
 6        /// <returns></returns>
 7        public static string NumToChineseNumStr(int num)
 8        {
 9            if(num <= 0 num > 99999)
10                throw new ArgumentException("num");
11            string[] GradeChar = new string[]{"","十","百","千","万"};
12            string[] DigitChar = new string[]{"一","二","三","四","五","六","七","八","九"};
13            char zero = '零';
14
15            int length = (int) Math.Log10(num) + 1;
16            StringBuilder output = new StringBuilder(length);
17            int[] input = new int[length];
18            int index = -1;
19            while(++index != length)
20            {
21                input[index] = (num  / (length - index == 1? 1 : (int)Math.Pow(10, length -index -1))) % 10;
22            }
23
24            bool needFix = false;
25            if(input.Length == 2 && input[0] == 1)
26                needFix = true;
27
28            for(int pos = 0; pos < input.Length; pos ++)
29            {
30                if(input[pos] == 0)
31                {
32                    if(output[output.Length -1] != zero)
33                        output.Append(zero);
34                    continue;
35                }
36                else if(!(pos == 0 && needFix))
37                {
38                    output.Append(DigitChar[input[pos] -1]);
39                }
40                output.Append(GradeChar[input.Length - pos -1]);
41            }
42            if(output[output.Length - 1] == zero)
43                output.Remove(output.Length - 1, 1);
44            return output.ToString();
45        }
46