如何通过索引从可观察项集合中获取对象？

Question

我需要通过索引获取可观察集合中的对象，以访问该索引处项目的属性。

这是代码片段：

public ObservableCollection<TipsModel> TipObjects;
  private void LoadContent()
        {
            TipObjects = new ObservableCollection<TipsModel>();

            for (int i = 0; i < 5; i++)
            {
                TipsModel item = new TipsModel()
                {
                    Image = ImageSource.FromFile("nonindustryIcon.png"),
                    Title = "Kill energy vampires and save up to 0 a year",
                    Text = "Seventy-five percentof the electrical use by home electronics occurs when they're at home. \n People not at home means no electricity. Do not stay at home. Go stay on the streets. ",

                };
                TipObjects.Add(item);
            }
            foreach (TipsModel item in TipObjects)
            {
                img = item.Image;
                tipTitle = item.Title;
                tip = item.Text;
                item.Content = CreateContent();              
            }

            slideView.ItemsSource = TipObjects;
        }

  private void slideView_SlidedToIndex(object sender, Telerik.XamarinForms.Primitives.SlideView.SlideViewSlidedToIndexEventArgs e)
        {

            var slideId = slideView.Id;
            //TipsModel tip = TipObjects.item at index[18];

        }

Answer 1

你可以正常做

var tip = TipObjects[18];

Observable 集合只是一个普通的、功能齐全的支持索引的集合。

或者您也可以使用 Items 属性。两种方法是等效的：

var tip = TipObjects.Items[18];

如何通过索引从可观察项集合中获取对象？

How do I get an object from an observable item Collection by index?

object

telerik

observablecollection

xamarin

xamarin.forms