要求：用C#编写出一个可以算出.cs或者.java文件里的总行数，空白行数，注释行数，代码行数

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication2
{
    class Program
    {
        static int commentLineCount = 0, allLineCount = 0, blankLineCount = 0, codeLineCount = 0;

        static void Main(string[] args)//主函数
        {
            Console.WriteLine("请输入文件路径:");
            String path = Console.ReadLine();
            count(path);
            Console.WriteLine("总行数为{0}\n空白行数为{1}\n注释行数为{2}\n代码行数为{3}", allLineCount = blankLineCount + commentLineCount + codeLineCount, blankLineCount, commentLineCount, codeLineCount);
            Console.WriteLine("请输入任意键继续");
            Console.ReadKey();
        }
        static void count(string file)
        {

            try
            {
                //读取文件
                FileStream aFile = new FileStream(file, FileMode.Open);
                StreamReader sr = new StreamReader(aFile);
                string line = sr.ReadLine();
                //开始判断
                while (line != null)
                {
                    if (line.Trim() != "" && !(line.Trim().StartsWith(@"//")))
                    {
                        codeLineCount++;
                    }
                    else if (line.Trim().StartsWith(@"//") || line.Trim().StartsWith(@"///"))
                    {
                        commentLineCount++;
                    }
                    else
                    {
                        blankLineCount++;
                    }

                    line = sr.ReadLine();
                }
                sr.Close();
            }
            catch (IOException e)
            {
                Console.WriteLine("An IO exception has been thrown!");
                Console.WriteLine(e.ToString());
                return;
            }
        }
    }

}

异常处理：