如何在xamarin表单中实现多文件上传？

Question

I am working on xamarin forms, where I am trying to achieve multiple file upload. What I have tried is using file picker plugin which will give me upload one file but my requirement is multiple file upload.

//My xaml
<Button Text="Pick File" Clicked="Button_Clicked" HorizontalOptions="Center"  
               VerticalOptions="Center"/>
//my C#
var file = await CrossFilePicker.Current.PickFile();

//MY API (WEB API DOT NET CORE)

public async Task<IActionResult> RaiseTicket()
{
    //I am sending few object in header those things I am reading here
    var mslAddProviderUser = JsonConvert.DeserializeObject<MRaiseTicket>(Request.Headers["mdl"]);

    var boundary = MultipartRequestHelper.GetBoundary(MediaTypeHeaderValue.Parse(Request.ContentType), _defaultFormOptions.MultipartBoundaryLengthLimit);
    var reader = new MultipartReader(boundary, HttpContext.Request.Body);
    //This section variable holds my all files and It is working I have tested using our web application
    **var section = await reader.ReadNextSectionAsync();** 
}

How to do for multiple files and is there another way to achieve the same?

Answer 1

Xamarin doesn't implement any cross platform way to pick files, so you either need to implement it yourself using the platform APIs or to find the plugin that does that. As the plugin to pick multiple files doesn't seem to exist, then you need to implement it yourself using native APIs and dependency injection. For example, this is API for iOS: https://developer.apple.com/documentation/uikit/uidocumentpickerviewcontroller?language=objc , you need to implement file picker for iOS using this API and then use it from Xamarin using dependency injection (or shared project but it is rarely used today though it is simpler).