仅当文件名是指定文本文件c中的文件名时，才将文件从一个文件夹复制到另一个文件夹

Question

I need to copy files from one folder to another but only if their file name is also in a text file. The text file is set up like so

file1.jpg
file2.jpg
file3.jpg
etc 

There are around one-million files to copy. I'm using C#.

What would the best way to go about this be? I'm not sure if I should first read all the file names from the text file and put them in to a list then possibly convert the list in to an array then maybe use the array somehow? Or maybe there's a better way to go about it?

I know how to read and write to files and how to copy from one source destination to another. I don't know how to filter out specific files when copying from one source destination to another though.

Any help is greatly appreciated.

Thank you.

Answer 1

The following code will help you the process you want

        string source = @"C:\SourcePath\";
        string destination = @"C:\DestinationPath\";

        string[] strFiles = File.ReadAllText(@"C:\Filename.txt").Split(' ');
        for (int i = 0; i < strFiles.Length; i++)
        {
            File.Copy(source + strFiles[i], destination + strFiles[i]);
        }

Answer 2

If the text file is one line with million files name. Use this

        string from = @"c:\from" , to =@"d:\to"; // source and destination
        StreamReader file = new StreamReader(@"c:\list.txt"); // your files list
        string total=file.ReadLine();

        string[] tobecopied = total.Split(' ');
        foreach(string fil in tobecopied)
        {
            if(File.Exists(from+@"\"+fil))
               {
                File.Copy(from+@"\"+fil,to+@"\"+fil);
               }
            else
               {
                MessageBox.Show(fil+"Not found ");
               }
        }

But if the text file have 1 line per 1 file , for example

FIle1.exe

File2.exe

use this

        string from = @"c:\from" , to =@"d:\to"; // source and destination
        StreamReader file = new StreamReader(@"c:\list.txt"); // your files list
        string total="";
        string temp="";
        while((temp=file.ReadLine())!=null)
        {
            total+=temp+" ";

        }
        string[] tobecopied = total.Split(' ');
        foreach(string fil in tobecopied)
        {
            if(File.Exists(from+@"\"+fil))
               {
                File.Copy(from+@"\"+fil,to+@"\"+fil);
               }
            else
               {
                MessageBox.Show(fil+"Not found ");
               }
        }

These ways also check for file existance.

Hope it works. If someone see error please edit it.