MessagingCenter不接收消息

Question

我已经从这个链接下载了MultiImagePicker：https://github.com/danielkon96/MultiImagePickerand，它运行正常，没有任何问题。当我添加所有的接口和类.在我的项目中，MessagingCenter不接收消息。

ButtonClick in UploadPage：

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;
   }
});

OnActivityResult in MainActivity：

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

有什么问题吗？

Answer 1

感谢@pinedax在this question中的回答，我通过这种改变解决了我的问题：

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);