OpenTween.MediaSelector.BeginSelection C# (CSharp) Method

        public void BeginSelection()
        {
            if (!this.Visible)
            {
                this.BeginSelecting?.Invoke(this, EventArgs.Empty);

                this.Visible = true;
                this.Enabled = true;

                var media = (SelectedMedia)ImagePageCombo.SelectedItem;
                ImageFromSelectedFile(media.Item, true);
                ImagefilePathText.Focus();
            }
        }

        public void BeginSelection_MultiImageTest()
        {
            using (var twitter = new Twitter())
                using (var mediaSelector = new MediaSelector {
                    Visible = false, Enabled = false
                })
                {
                    twitter.Initialize("", "", "", 0L);
                    mediaSelector.Initialize(twitter, TwitterConfiguration.DefaultConfiguration(), "Twitter");

                    var images = new[] { "Resources/re.gif", "Resources/re1.png" };
                    mediaSelector.BeginSelection(images);

                    // 3 ページ目まで選択可能な状態
                    var pages = mediaSelector.ImagePageCombo.Items;
                    Assert.Equal(new[] { "1", "2", "3" }, pages.Cast <object>().Select(x => x.ToString()));

                    // 1 ページ目が表示されている
                    Assert.Equal("1", mediaSelector.ImagePageCombo.Text);
                    Assert.Equal(Path.GetFullPath("Resources/re.gif"), mediaSelector.ImagefilePathText.Text);

                    using (var imageStream = File.OpenRead("Resources/re.gif"))
                        using (var image = MemoryImage.CopyFromStream(imageStream))
                        {
                            Assert.Equal(image, mediaSelector.ImageSelectedPicture.Image);
                        }
                }
        }