Generate a filename with a number inside parentheses

Question

I'm working with ASP.NET project where the user can upload files to the server. I want to save the file with its original name, but if the file with the same name already exists, how can I generate a filename with a number in the parenthesis like Windows does?

Files are uploaded to a particular folder and saved with its client-side name itself. So, if a file named myimage.jpg is uploaded and a file with the same name already exists in the server, I need to rename it to myimage(1).jpg or if 'myimage.jpg' to 'myimage(n).jpg' exists, I need to rename it to myimage(n+1).jpg.

What will be the best way to search for and generate such file names? My first guess was to use LINQ with a regex over DirectoryInfo.EnumerateFiles(), but is that a good approach?

Answer 1

public static object lockObject = new object();
void UploadFile(...)
{
    //-- other code
    lock (lockObject)
    {
        int i = 1;
        string saveFileAs = "MyFile.txt";
        while (File.Exists(saveFileAs))
        {
           string fileNameWithoutExt = Path.GetFileNameWithoutExtension(saveFileAs);
           string ext = Path.GetExtension(saveFileAs)
           saveFileAs = String.Concat(fileNameWithoutExt, "(", i.ToString(), ")", ext);
           i++;
        }

        //-- Now you can save the file.
    }
}