Xamarin & Multiple Filepicker

Question

i'm building a project on Xamarin. Right now i have a big issue. I need to browse user's computer for upload any file. He can of course upload multiple files. As i know Xamarin does not provide browsing of all the system but just its. So i tried to find a way with some drag n drop, i didn't find. I tried a filepicker but he let me pick just one file (my client would upload 100 files at once) so it doesn't fit to what i need. Finally i decided to do my own browsing system but it takes forever to browse because of the UI. Do you have any solution for me ? I would appreciate a package with a filepicker that allow multiple files.

Thanks

ColeX · Answer 1 · 2020-04-30T09:04:07.943

2

Have you tried the class FileOpenPicker in UWP ?

It supports to pick multiple files , check the method FileOpenPicker.PickMultipleFilesAsync.

Sample

Define interface in Forms project

public interface MyFilePicker
{
    Task OpenFilePickerAsync();
}

Implement in UWP project

[assembly: Dependency(typeof(UWPFilePicker))]
namespace App24.UWP
{
    class UWPFilePicker : MyFilePicker
    {
        public async Task OpenFilePickerAsync()
        {
            var openPicker = new FileOpenPicker();
            openPicker.ViewMode = PickerViewMode.Thumbnail;
            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            openPicker.FileTypeFilter.Add(".jpg");
            openPicker.FileTypeFilter.Add(".jpeg");
            openPicker.FileTypeFilter.Add(".png");
            IReadOnlyList<StorageFile> files = await openPicker.PickMultipleFilesAsync();
            if (files.Count > 0)
            {
                StringBuilder output = new StringBuilder("Picked files:\n");
                // Application now has read/write access to the picked file(s)

            }
            else
            {
                return;
            }
        }
    }
}

Call it in Forms project

private async void Button_Clicked(object sender, EventArgs e)
{
    MyFilePicker service = DependencyService.Get<MyFilePicker>();
    await service.OpenFilePickerAsync();
}

edited Apr 30 '20 at 09:04

answered Apr 29 '20 at 11:20

ColeX

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but is it crossplatform ? Or should i do code for IOS & UWP ? – Philigane Apr 29 '20 at 13:02
It is only used in UWP , you can create dependency service to call it . – ColeX Apr 29 '20 at 13:10
can you explain please it is really interesting ? – Philigane Apr 29 '20 at 13:11
imma trying to make it work but i can't i have an error iAsyncOperation . I think your solutin with a dependency service is more useful but i don't know how to implement it – Philigane Apr 29 '20 at 14:55
Check the tutorial : https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/dependency-service/introduction , it's just a way to call native api from specific platform . – ColeX Apr 29 '20 at 15:02
I find the Xamarin.Plugin.FilePicker but it can not pick multiple file – lindexi Apr 30 '20 at 00:32
yes i saw it, it doesn't fit what i need @lindexi but thanks. Gonna check your tutorial Cole thanks – Philigane Apr 30 '20 at 08:45
Check the simple sample . – ColeX Apr 30 '20 at 09:04

Xamarin & Multiple Filepicker

1 Answers1

Sample