Xamarin Forms 消息中心沒有收到消息

Question

我已經從這個鏈接下載了 MultiImagePicker： https://github.com/danielkon96/MultiImagePicker ，它工作正常，沒有任何問題。 當我在我的項目中添加所有接口和類時，MessagingCenter 沒有收到消息。

UploadPage中的ButtonClick：

MessagingCenter.Unsubscribe<App, List<string>>((App)Xamarin.Forms.Application.Current, "ImagesSelectedAndroid");
MessagingCenter.Subscribe<App, List<string>>((App)Xamarin.Forms.Application.Current, "ImagesSelectedAndroid", (s, images) =>
{
   if (images.Count > 0)
   {
      ImgCarouselView.ItemsSource = images;
      InfoText.IsVisible = true;
   }
});

MainActivity 中的 OnActivityResult：

MessagingCenter.Send<App, List<string>>((App)Xamarin.Forms.Application.Current, "ImagesSelectedAndroid", images);

有什么問題？

Answer 1

感謝@pinedax 對這個問題的回答，我通過這個改變解決了我的問題：

MessagingCenter.Unsubscribe<Xamarin.Forms.Application, List<string>>(Xamarin.Forms.Application.Current, "ImagesSelectedAndroid");

MessagingCenter.Subscribe<Xamarin.Forms.Application, List<string>>(Xamarin.Forms.Application.Current, "ImagesSelectedAndroid", (s, images) =>

和

MessagingCenter.Send<Xamarin.Forms.Application, List<string>>(Xamarin.Forms.Application.Current, "ImagesSelectedAndroid", images);