AppUpdater.Manifest.VersionManifest.UpdateTo C# (CSharp) Method

        public UpdateRecipe UpdateTo(VersionManifest newVersionManifest)
        {
            List<UpdateRecipeFile> recipeFiles = new List<UpdateRecipeFile>();
            foreach (var file in newVersionManifest.Files)
            {
                VersionManifestFile originalFile = this.Files.FirstOrDefault(x => x.Name.Equals(file.Name, StringComparison.CurrentCultureIgnoreCase));
                FileUpdateAction action = FileUpdateAction.Download;
                string fileToDownload = file.DeployedName;
                long size = file.Size;
                if (originalFile != null)
                {
                    if (originalFile.Checksum == file.Checksum)
                    {
                        action = FileUpdateAction.Copy;
                    }
                    else if (DeltaAPI.IsSupported())
                    {
                        VersionManifestDeltaFile delta = file.GetDeltaFrom(originalFile.Checksum);
                        if (delta != null)
                        {
                            action = FileUpdateAction.DownloadDelta;
                            fileToDownload = delta.Filename;
                            size = delta.Size;
                        }
                    }
                }

                recipeFiles.Add(new UpdateRecipeFile(file.Name, file.Checksum, size, action, fileToDownload));
            }

            return new UpdateRecipe(newVersionManifest.Version, this.Version, recipeFiles);
        }

        public void UpdateTo_WithAnIncorrectDelta_SetTheActionAsDownload()
        {
            VersionManifestFile fileOriginal = new VersionManifestFile("arquivo1.txt", "333", 1000);
            VersionManifestFile fileUpdate = new VersionManifestFile("arquivo1.txt", "123", 1000);
            fileUpdate.Deltas.Add(new VersionManifestDeltaFile("deltas\\arquivo1.txt", "444", 10));
            VersionManifest currentManifest = new VersionManifest("1.0.0", new VersionManifestFile[] { fileOriginal });
            VersionManifest updateManifest = new VersionManifest("2.0.0", new VersionManifestFile[] { fileUpdate });

            UpdateRecipe recipe = currentManifest.UpdateTo(updateManifest);

            Assert.That(recipe.Files, Has.Count.EqualTo(1));
            Assert.That(recipe.Files.First().Action, Is.EqualTo(FileUpdateAction.Download));
        }