c#文件比较Code

　　我想我们很多时候想比较一个文件里面是否有改动，比如一个dll库是新加了一个方法或修改了其中的方法实现，不能通过可视化的工具来比较的时候，可以用这个小工具来比较， 以下是比较文件的代码。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;



namespace FilesCompare

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Please type the first file.");

            string firstFilePath = Console.ReadLine();



            Console.WriteLine("Please type the second file.");

            string secondFilePath = Console.ReadLine();



            bool isEqual = CompareFiles(firstFilePath, secondFilePath);

            Console.WriteLine(isEqual ? "equal" : " Not equal");



            Console.Read();

        }



        public static bool CompareFiles(string targetFile, string updatedFile)

        {

            FileInfo targetFileInfo = new FileInfo(targetFile);

            FileInfo updatedFileInfo = new FileInfo(updatedFile);



            if (targetFileInfo.Length != updatedFileInfo.Length)

            {

                return false;

            }



            using (FileStream targetStream = File.OpenRead(targetFile))

            {

                using (FileStream updatedStream = File.OpenRead(updatedFile))

                {

                    if (targetStream.Length != updatedStream.Length)

                    {

                        return false;

                    }



                    // Using a larger buffer than the default buffer of 4 * 1024 used by FileStream.ReadByte improves performance.

                    // The buffer size is based on user feedback. Based on performance results, a better buffer size may be determined.

                    byte[] targetBuffer = new byte[16 * 1024];

                    byte[] updatedBuffer = new byte[16 * 1024];

                    int targetReadLength;

                    int updatedReadLength;

                    do

                    {

                        targetReadLength = targetStream.Read(targetBuffer, 0, targetBuffer.Length);

                        updatedReadLength = updatedStream.Read(updatedBuffer, 0, updatedBuffer.Length);



                        if (targetReadLength != updatedReadLength)

                        {

                            return false;

                        }



                        for (int i = 0; i < targetReadLength; ++i)

                        {

                            if (targetBuffer[i] != updatedBuffer[i])

                            {

                                return false;

                            }

                        }



                    } while (0 < targetReadLength);

                }

            }



            return true;

        }



    }

}