C＃WP8.1：將圖像從圖庫轉換為base64

Question

我在開發應用程序時遇到了一些麻煩。 我現在想做的是讓用戶從畫廊（相冊）中挑選圖片並顯示出來。 此外，我想將拍攝的照片轉換為Base64字符串。 現在，我已經成功地從圖庫中提取並顯示圖片了，無論如何我都可以將圖片轉換為base64字符串。

這是我抓取並顯示的代碼

private void picprofile_Tapped(object sender, TappedRoutedEventArgs e)
    {
        CoreApplicationView view;
        String ImagePath;
        view = CoreApplication.GetCurrentView();

        ImagePath = string.Empty;
        FileOpenPicker filePicker = new FileOpenPicker();
        filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        filePicker.ViewMode = PickerViewMode.Thumbnail;

        // Filter to include a sample subset of file types
        filePicker.FileTypeFilter.Clear();
        filePicker.FileTypeFilter.Add(".bmp");
        filePicker.FileTypeFilter.Add(".png");
        filePicker.FileTypeFilter.Add(".jpeg");
        filePicker.FileTypeFilter.Add(".jpg");

        filePicker.PickSingleFileAndContinue();
        view.Activated += viewActivated; 
    }

    private async void viewActivated(CoreApplicationView sender, IActivatedEventArgs args1)
    {
        CoreApplicationView view;           
        view = CoreApplication.GetCurrentView();

        FileOpenPickerContinuationEventArgs args = args1 as FileOpenPickerContinuationEventArgs;

        if (args != null)
        {
            if (args.Files.Count == 0) return;

            view.Activated -= viewActivated;
            StorageFile storageFile = args.Files[0];
            var stream = await storageFile.OpenAsync(Windows.Storage.FileAccessMode.Read);
            var bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
            await bitmapImage.SetSourceAsync(stream);

            var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);
            picprofile.ImageSource = bitmapImage;
        }
    }

Answer 1

請參閱幫助下面的代碼。 我希望有多種方法可以做到這一點。 該鏈接可能對您有幫助

public async Task<string> ImageToBase64(StorageFile MyImageFile)
    {
        Stream ms = await MyImageFile.OpenStreamForReadAsync();
        byte[] imageBytes = new byte[(int)ms.Length];
        ms.Read(imageBytes, 0, (int)ms.Length);
        return Convert.ToBase64String(imageBytes);
    }