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LopezAi
Asked: 2020-10-06 23:42:44 +0800 CST 2020-10-06 23:42:44 +0800 CST

Name a backup but it doesn't match the old one C#

  • 772

My code makes a backup of a folder, if the backup folder exists it creates another adding "_1" and if it doesn't it creates a new one. I don't know how to make it so that when there is more than one backup folder, it automatically generates another one without the name matching, I leave you here the code that I have obtained so far:

//backup del directorio destino en otra carpeta
private static void directoryCopy(string sourceDirName, string destDirName, bool copySubDirs)
{
    // Get the subdirectories for the specified directory.
    DirectoryInfo dir = new DirectoryInfo(sourceDirName);
    DirectoryInfo[] dirs = dir.GetDirectories();



    if (!dir.Exists)
    {
        throw new DirectoryNotFoundException(
            "Source directory does not exist or could not be found: "
            + sourceDirName);
    }

    if (Directory.Exists(destDirName))
    {
        destDirName = destDirName + "_1";
        Directory.CreateDirectory(destDirName);
    }
    else
    // If the destination directory doesn't exist, create it. 
    {
        Directory.CreateDirectory(destDirName);
    }

    // Get the files in the directory and copy them to the new location.
    FileInfo[] files = dir.GetFiles();
    foreach (FileInfo file in files)
    {
        string temppath = Path.Combine(destDirName, file.Name);
        file.CopyTo(temppath, false);
    }

    // If copying subdirectories, copy them and their contents to new location. 
    if (copySubDirs)
    {
        foreach (DirectoryInfo subdir in dirs)
        {
            string temppath = Path.Combine(destDirName, subdir.Name);
            directoryCopy(subdir.FullName, temppath, copySubDirs);
        }
    }
}
c#

1 Answers

  1. Best Answer

    There are many solutions to your problem. You can, as they tell you in another answer, use the date and time. You can use a guid so that the folder is always unique.

    I give you a solution so that the folders always end in a sequential number (_1,_2,_3...). It is not very optimized, but it can help you see how to do it:

    while (Directory.Exists(destDirName)) //repetimos hasta que no exista el directorio
{
    int indice = 0;
    var splitted = destDirName.Split('_'); //separamos el nombre para obtener el número secuencial

    if (int.TryParse(splitted.Last(), out indice))
    {
        //si la última parte del nombre es un numero, lo incrementamos
        indice++;
    }

    if (splitted.Length > 1)
    {
        //unimos el nombre de la carpera quitando la última parte (_X) 
        //y le añadimos el nuevo indice
        destDirName = String.Join("", splitted.Reverse().Skip(1).Reverse()) + "_" + indice.ToString(); 
    }
    else
    {
        //si no era un número, añadimos _1
        destDirName+= "_" + indice.ToString();
    }
}

//una vez tenemos un nombre único, creamos la carpeta
Directory.CreateDirectory(destDirName);
    • 2