Convert a image to a base 64 string xamarin

Question

I followed this guide here https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/dependency-service/photo-picker

async void OnPickPhotoButtonClicked(object sender,EventArgs e) { (sender as Image).IsEnabled = false; Stream stream = await DependencyService.Get<IPhotoPickerService>().GetImageStreamAsync(); if(stream != null) { temp_photo.Source = ImageSource.FromStream(() => stream); } (sender as Image).IsEnabled = true; }

When I select an image using this it will show the image from the gallery in the

What I need to do is convert the image to a base64_string so that it can be sent to our server

I tried following the accepted answer from this link https://forums.xamarin.com/discussion/81344/how-to-convert-image-from-plugin-media-to-base64

var stream = file.GetStream(); var bytes = new byte [stream.Length]; await stream.ReadAsync(bytes, 0, (int)stream.Length); string base64 = System.Convert.ToBase64String(bytes);

Adopting my method to look like this

async void OnPickPhotoButtonClicked(object sender,EventArgs e) { (sender as Image).IsEnabled = false; Stream stream = await DependencyService.Get<IPhotoPickerService>().GetImageStreamAsync(); if(stream != null) { temp_photo.Source = ImageSource.FromStream(() => stream); var bytes = new byte[stream.Length]; await stream.ReadAsync(bytes, 0, (int)stream.Length); string base64 = System.Convert.ToBase64String(bytes); } (sender as Image).IsEnabled = true; }

But upon selecting an image this causes the application to crash

How can I convert the image selected into a base64 string?

For reference I am testing on an android device

Edit: Wrapped my method in a try block to catch the exception and this is what it says

Specified method is not supported.

the first thing you need to do with any crash is identify the exception that causes it. We can't help you until you do that. However, I will note that there is a Media plugin for XF that eliminates the need to use the DependencyService approach — Jason
– Jason, Commented May 6, 2020 at 21:20

Leo Zhu · Accepted Answer · 2020-05-07 03:28:23Z

Please try to copy the steam to a new MemoryStream like this:

async void OnPickPhotoButtonClicked(object sender, EventArgs e) { Stream stream = await DependencyService.Get<IPhotoPickerService>().GetImageStreamAsync(); if (stream != null) { using (MemoryStream memory = new MemoryStream()) { stream.CopyTo(memory); byte[] bytes = memory.ToArray(); image.Source = ImageSource.FromStream(() => new MemoryStream(bytes)); string base64 = System.Convert.ToBase64String(bytes); } } (sender as Button).IsEnabled = true; }

This stops the app from crashing but now base64 = Xamarin.Forms.StreamImageSource
@MysteryMan Couldn't you get the base64 ?I could get the base64 correctly with the method.

M. Hamza Rajput · Accepted Answer · 2020-05-07 02:45:55Z

Try it.

public static class StreamExtensions { public static string ConvertToBase64(this Stream stream) { var bytes = new Byte[(int)stream.Length]; stream.Seek(0, SeekOrigin.Begin); stream.Read(bytes, 0, (int)stream.Length); return Convert.ToBase64String(bytes); } } try { var base64String = stream.ConvertToBase64(); } catch (Exception ex){ Console.WriteLine(ex.message); }

This also stops the app from crashing but creates the same issue as above stated base64string = Xamarin.Forms.StreamImageSource

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