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我有一个CarouselView只显示一个图像，CarouselView它绑定到一个只存储一个字符串的模型列表。

现在，当我从 ViewModel 中的构造函数向该列表添加图像时，它按预期工作，但我有一个运行的方法，OnAppearing我希望从那里设置它。

现在，当我从该方法将图像添加到该列表时，它会将图像添加到列表中，但不会在CarouselView.

有人知道为什么会这样吗？

我的代码：查看：

    <CarouselView ItemsSource="{Binding ImageList}"
                                  HeightRequest="260"
                                  Loop="False"
                                  HorizontalScrollBarVisibility="Never">
                            <CarouselView.ItemTemplate>
                                <DataTemplate x:DataType="models:CarouselImage">
                                    <Image Source="{Binding Image}"
                                           HeightRequest="260"
                                           Aspect="AspectFill"/>
                                </DataTemplate>
                            </CarouselView.ItemTemplate>
                        </CarouselView>

视图模型：

namespace YourPartys.ViewModels
{
   [QueryProperty(nameof(Locationid), nameof(Locationid))]
   public class DetailViewModel : ViewModelBase
   {
       #region Variables

       #endregion

       #region Propertys
       public List<CarouselImage> ImageList { get; set; } = new List<CarouselImage>();
       string locationid;
       public string Locationid
       {
           get => locationid;
           set => SetProperty(ref locationid, value);
       }
       LocationModel location;
       public LocationModel Location
       {
           get => location;
           set => SetProperty(ref location, value);
       }
       #endregion


       //Constructor
       public DetailViewModel()
       {
           Location = new LocationModel();

           //ImageList.Add(new CarouselImage { Image = "https://club-l1.de/wp-content/uploads/2019/11/dsc08645-1200x800.jpg" });
       }

       public override async void VModelActive(Page sender, EventArgs eventArgs)
       {
           base.VModelActive(sender, eventArgs);

           Location = await FirestoreService.GetOneLocation(Collection: "Locations", Locationid: Locationid);

           //List for images
           if (Location != null)
           {
               if (Location.Images.MainImage != null)
               { ImageList.Add(new CarouselImage() { Image = Location.Images.MainImage }); };
               foreach (string _image in Location.Images.ExtraImages)
               {
                   ImageList.Add(new CarouselImage() { Image = _image });
               }
           }
       }
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1 回答 1

0

ObservableCollection而不是List作品

于 2022-01-16T19:36:00.003 回答