C#: What is the fastest way to generate a unique filename?

Question

I\'ve seen several suggestions on naming files randomly, including using

System.IO.Path.GetRandomFileName()

or using a

Sy         


        

Answer 1

I hope this self iterative function will help someone to generate a unique filename.

public string getUniqueFileName(int i, string fullpath, string filename)
{
    string lstDir = fullpath.Substring(0, fullpath.LastIndexOf('\\'));
    string name = Path.GetFileName(fullpath);
    string path = fullpath;

    if (name != filename)
        path = Path.Combine(lstDir, filename);

    if (System.IO.File.Exists(path))
    {
        string ext = Path.GetExtension(name);
        name = Path.GetFileNameWithoutExtension(name);                
        i++;
        filename = getUniqueFileName(i, fullpath, name + "_" + i + ext);
    }

    return filename;
}