C# get folder's Md5 generated by file's and filename's md5. get dictionary md5

C# get dictionary md5

 static string GetDicMD5(string dirFullName)
        {
             
            logBuilder = new StringBuilder();
            Dictionary<string, string> folderMd5Dic = GetFolderFilesAndNameMD5Dic(dirFullName);
            if (folderMd5Dic == null && folderMd5Dic.Any())
            {
                return null;
            }

            using (MemoryStream ms = new MemoryStream())
            { 
                using (MD5 folderDicMd5 = MD5.Create())
                {
                    StringBuilder folderDicBuilder = new StringBuilder();
                    BinaryFormatter binFormatter = new BinaryFormatter();
                    binFormatter.Serialize(ms, folderMd5Dic);
                    byte[] folderDicMd5Bytes = folderDicMd5.ComputeHash(ms);
                    if(folderDicMd5Bytes!=null && folderDicMd5Bytes.Any())
                    {
                        for(int i=0;i<folderDicMd5Bytes.Length;i++)
                        {
                            folderDicBuilder.Append(folderDicMd5Bytes[i].ToString("x2"));
                        }                       
                    }
                    return folderDicBuilder.ToString();
                }                    
            }           
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace FolderMd5NS
{
    class Program
    {
        static StringBuilder logBuilder=null;
        static int fileMd5Num = 0;
        static int totalFilesNum = 0;
        static void Main(string[] args)
        {
            string dirFullName = @"D:\C";
            try
            {
                string currentoFolderMd5 = GetFolderMD5(dirFullName);
                Console.WriteLine(currentoFolderMd5);                
            }
            catch
            {

            }

            finally
            {
                using (StreamWriter logWriter = new StreamWriter($"{DateTime.Now.ToString("yyyyMMddHHmmssffff")}log.txt", true))
                {
                    logBuilder.AppendLine($"\n\n There are {totalFilesNum} files in {dirFullName},get md5 file number:{fileMd5Num}");
                    logWriter.WriteLine(logBuilder.ToString());
                }
            }
            
            Console.ReadLine();
        }

         
        static string GetFolderMD5(string dirFullName)
        {
            fileMd5Num = 0;
            totalFilesNum = 0;
            logBuilder = new StringBuilder();
            Dictionary<string, string> folderMd5Dic = GetFolderFilesAndNameMD5Dic(dirFullName);
            if (folderMd5Dic == null && folderMd5Dic.Any())
            {
                return null;
            }

            using (MemoryStream ms = new MemoryStream())
            { 
                using (MD5 folderDicMd5 = MD5.Create())
                {
                    StringBuilder folderDicBuilder = new StringBuilder();
                    BinaryFormatter binFormatter = new BinaryFormatter();
                    binFormatter.Serialize(ms, folderMd5Dic);
                    byte[] folderDicMd5Bytes = folderDicMd5.ComputeHash(ms);
                    if(folderDicMd5Bytes!=null && folderDicMd5Bytes.Any())
                    {
                        for(int i=0;i<folderDicMd5Bytes.Length;i++)
                        {
                            folderDicBuilder.Append(folderDicMd5Bytes[i].ToString("x2"));
                        }                       
                    }
                    return folderDicBuilder.ToString();
                }                    
            }           
        }

        static Dictionary<string,string> GetFolderFilesAndNameMD5Dic(string dirFullName)
        {
            if (!Directory.Exists(dirFullName))
            {
                return null;
            }

            string[] allFilesInFolder = Directory.GetFiles(dirFullName, "*", SearchOption.AllDirectories);
            totalFilesNum = allFilesInFolder.Count();
            if (allFilesInFolder == null && !allFilesInFolder.Any())
            {
                return null;
            }

            Dictionary<string, string> folderMd5CheckDic = new Dictionary<string, string>();
            GetDirAllFilesMd5ToDic(allFilesInFolder, folderMd5CheckDic);
            return folderMd5CheckDic;
        }

        private static void GetDirAllFilesMd5ToDic(string[] allFilesInFolder, Dictionary<string, string> folderMd5CheckDic)
        {
            try
            {
                foreach (var file in allFilesInFolder)
                {
                    string fileMd5 = GetSingleFileMD5(file);
                    string fileNameMd5 = GetFileNameMD5(file);
                    string dicKey = fileMd5 + fileNameMd5;
                    folderMd5CheckDic.Add(dicKey, file);
                    string msg = $"FileName:{file}, file md5:{fileMd5},num:{fileMd5Num++}";
                    Console.WriteLine(msg);
                    logBuilder.AppendLine(msg);
                }
            }
            catch
            {
            }            
        }

        static string GetSingleFileMD5(string fileFullName)
        {
            if (!File.Exists(fileFullName))
            {
                return string.Empty;
            }
            StringBuilder md5Builder = new StringBuilder();
            try
            {    
                using (FileStream fs = File.Open(fileFullName, FileMode.Open))
                {
                    using (MD5 md5 = MD5.Create())
                    {
                        byte[] md5Bytes = md5.ComputeHash(fs);
                        for (int i = 0; i < md5Bytes.Length; i++)
                        {
                            md5Builder.Append(md5Bytes[i].ToString("x2"));
                        }
                    }
                }
                return md5Builder?.ToString();
            }
            catch
            {
                return string.Empty;
            }                  
        }

        static string GetFileNameMD5(string fileFullName)
        {
            if (!File.Exists(fileFullName) || string.IsNullOrEmpty(fileFullName))
            {
                return string.Empty;
            }
            StringBuilder fileNameMd5Builder = new StringBuilder();
            try
            {
                byte[] fileNameBytes = Encoding.UTF8.GetBytes(fileFullName);
                using (MD5 fileNameMd5 = MD5.Create())
                {
                    byte[] fileNameMd5Bytes = fileNameMd5.ComputeHash(fileNameBytes);
                    for (int i = 0; i < fileNameMd5Bytes.Length; i++)
                    {
                        fileNameMd5Builder.Append(fileNameMd5Bytes[i].ToString("x2"));
                    }
                }
                return fileNameMd5Builder?.ToString();
            }
            catch
            {
                return string.Empty;
            }            
        }
    }
}