MediaService.cs

using Orchard;
using Orchard.Autoroute.Services;
using Orchard.Environment.Extensions;
using Orchard.FileSystems.Media;
using Orchard.MediaLibrary.Factories;
using Orchard.MediaLibrary.Services;
using System.Collections.Generic;
using System.IO;

namespace Patient.Framework.Media {
    [OrchardSuppressDependency("Orchard.MediaLibrary.Services.MediaLibraryService")]
    public class MediaService : MediaLibraryService, IMediaLibraryService {
        private readonly ISlugService _slugService;

        public MediaService(IOrchardServices orchardServices,
            IMimeTypeProvider mimeTypeProvider,
            IStorageProvider storageProvider,
            IEnumerable<IMediaFactorySelector> mediaFactorySelectors,
            ISlugService slugService) :
            base(orchardServices, mimeTypeProvider, storageProvider, mediaFactorySelectors) {
            _slugService = slugService;
        }
        
        public new string GetUniqueFilename(string folderPath, string filename) {
            filename = filename.ToLower();

            // slugify filename to remove spaces
            filename = string.Concat(_slugService.Slugify(Path.GetFileNameWithoutExtension(filename)), Path.GetExtension(filename));

            return base.GetUniqueFilename(folderPath, filename);
        }
    }
}