我检查了您的代码,并对其进行了修改,以通过URI显示图像:
{
InitializeComponent();
CollectionOfItems = new ObservableCollection<SfCarouselItem>();
collectionOfItems.Add(new SfCarouselItem() { ItemContent = new Image { Source = ImageSource.FromUri(new Uri("https://cdn.syncfusion.com/content/images/Images/Ubuntu_Server_Succinctly_img.png?v=04082017080611"))}});
collectionOfItems.Add(new SfCarouselItem() { ItemContent = new Image { Source = ImageSource.FromUri(new Uri("https://cdn.syncfusion.com/content/images/Images/Go_Web_Development.png?v=04082017080611")) } });
collectionOfItems.Add(new SfCarouselItem() { ItemContent = new Image { Source = ImageSource.FromUri(new Uri("https://cdn.syncfusion.com/content/images/downloads/ebooks/AutoCAD_Succinctly_coverimage.png?v=04082017080611")) } });
collectionOfItems.Add(new SfCarouselItem() { ItemContent = new Image { Source = ImageSource.FromUri(new Uri("https://cdn.syncfusion.com/content/images/Images/MongoDB_3_Succinctly_final.png?v=04082017080611")) } });
carousel.ItemsSource = CollectionOfItems;
carousel.BindingContext = CollectionOfItems;
}