How to move files according to a given condition?

Question

.NET

Good afternoon, the essence of the question is as follows, there are several folders and files (for example, Documents and Service)

There is a C # code that should "scatter" files into folders (if the file is called "Document", then it must be placed in the "Documents" folder etc.)

using System;
using System.IO;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string common_path = @"C:\Users\User\Documents\Test";
            string pathA = @"C:\Users\User\Documents\Test\Документы";
            string pathB = @"C:\Users\User\Documents\Test\Служебные";
            string[] files = Directory.GetFiles(common_path,"Д*");        // Получаем список всех файлов (Документов)
            foreach(string s in files)
            {
                File.Move(s, pathA);
            }
        }
    }
}

But when executed, the error "System.IO.IOException: Cannot create file because it already exists" occurs, but there is nothing in the package.

Why does this error occur?

Answer 1

The second argument is not a folder, but the full path to a new file with a name.

var filename = Path.GetFileName(s);
File.Move(s, pathA + "\\" + filename);

Answer 2

Before File.Move, first check if there is a file with the same name in the directory, if there is, then unique (at least add a number, at least a timestamp) name before moving the file.