说明

控制台应用，启动后粘贴要处理的文件夹路径。获取文件夹内所有文件的列表，逐一进行MD5计算，没有记录的保存，发现MD5重复的时候删除此文件。

代码

c#

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace MD5删除
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("粘贴目标路径");

            string pathinput = Console.ReadLine();
            if (!Directory.Exists(pathinput + "\\output"))
            {
                Directory.CreateDirectory(pathinput + "\\output");
            }
            string[] filenames = Directory.GetFiles(pathinput);
            Dictionary<string, string> md5list =new Dictionary<string, string>();

            foreach (string filename in filenames)
            {
                string MD5code = GET_File_MD5(filename);
                if (md5list.ContainsKey(MD5code))
                {
                    File.Delete(filename);
                    Console.WriteLine("删除"+ filename);
                }
                else

                {
                    md5list.Add(MD5code, filename);
                    Console.WriteLine("记录" + filename);
                }
            }

            
        }
        static private string GET_File_MD5(string path)
        {
            try
            {
                byte[] buffer = File.ReadAllBytes(path); ;
                System.Security.Cryptography.MD5 file1_md5 = MD5.Create();
                byte[] retval = file1_md5.ComputeHash(buffer);
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < retval.Length; i++)
                {
                    sb.Append(retval[i].ToString("X2"));
                }
                return sb.ToString();
            }
            catch (Exception ep)
            {
                Console.WriteLine(ep.Message);
                return "";
            }
        }
    }
}