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I needed to be able to pass a file that was stored in a MemoryStream into my Kentico Media Library. In my case, the file was a dynamically generated PDF.

I couldn’t find anything on the web on how I would achieve this. So I decided to have a go creating my own method based on the Media Library API and some very basic examples, as you can see below:

public static string AddFile(MemoryStream file, string fileName, string description, string mediaLibrayName, string folder, string fileExt)
{
    string cleanFileName = MakeValidFileName(fileName).Replace(" ", "-");

    string folderDirectory = HttpContext.Current.Server.MapPath(String.Format("/MyWebsite/media/{0}/{1}/", mediaLibrayName, folder));

    string mediaFilePath = String.Format("{0}{1}.{2}", folderDirectory, cleanFileName, fileExt);

    if (!File.Exists(mediaFilePath))
    {
        #region Create File in Media Library Directory

        //Check if directory exists
        if (!Directory.Exists(folderDirectory))
            Directory.CreateDirectory(folderDirectory);

        file.Position = 0;

        FileStream outStream = new FileStream(mediaFilePath, FileMode.Create, FileAccess.Write);
        file.WriteTo(outStream);
        outStream.Flush();
        outStream.Close();

        #endregion

        #region Add file info to Kentico Media library

        //Media Library Info - takes Media Library Name and Website Name
        MediaLibraryInfo libraryInfo = MediaLibraryInfoProvider.GetMediaLibraryInfo(mediaLibrayName, CMSContext.CurrentSiteName);

        // Get Relative Path to File
        string path = CMS.MediaLibrary.MediaLibraryHelper.EnsurePath(mediaFilePath);

        //Create media file info item
        MediaFileInfo fileInfo = new MediaFileInfo(path, libraryInfo.LibraryID, folder);

        fileInfo.FileTitle = fileName;
        fileInfo.FileDescription = description;

        // Save media file info
        MediaFileInfoProvider.ImportMediaFileInfo(fileInfo);

        #endregion

        return String.Format("/MyWebsite/media/{0}/{1}/{2}.{3}?&ext=.{3}", mediaLibrayName, folder, cleanFileName, fileExt);
    }
    else
    {
        return String.Empty;
    }
}

The method I created is generic enough for you use in your own Kentico site. It provides all the necessary parameters needed  to add an image to a media library of your choice. For example:

AddFile(fileMemStream, “Marketing Issue", “Monthly Marketing Info”, "Private", "Premium Folder", "pdf");

As much as a like using the Kentico CMS platform, I find their API documentation some what lacking in examples on how to use certain methods, especially for a new Kentico developer like myself. I am hoping this is something that will change in the near future.