c# - does not display Items in ItemsControl

Question

I try to view items in ScrollViewer but it display nothing

There is Xaml:

<ScrollViewer>
    <ItemsControl ItemsSource="{Binding myList}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Text}" />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</ScrollViewer>

Ok. I make some changes in c# cod but it still does not work:

public class MyItem
{
    string text;
    public string Text
        {
            set { text = value;  }
            get { return text; }
        }
}
public partial class MainPage : PhoneApplicationPage
{
    public ObservableCollection<MyItem> myList { get; set; }

    public MainPage()
    {
        myList = new ObservableCollection<MyItem>();

        myList.Add(new MyItem() { Text = "Abkhazia" });
        myList.Add(new MyItem() { Text = "Afghanistan" });
        myList.Add(new MyItem() { Text = "Albania" }); 

        InitializeComponent();
    }
}

Answer 1

几个原因：

1. 你的 observablecollection 需要是公开的。

2. 你的 observablecollection 应该是一个属性。

   公共类 MyClass {

   public ObservableCollection<MyItem> myList {get; set;}
   
   
   public MyClass()
   {
   
       DataContext=this;
       myList = new ObservableCollection();
   
       myList.Add(new MyItem() { Text = "Abkhazia" });
       myList.Add(new MyItem() { Text = "Afghanistan" });
       myList.Add(new MyItem() { Text = "Albania" });
   }
   

   }

另外请记住，如果您修改“MyItem”需要支持 INotifyPropertyChanged，否则您的显示将不会更新。

Answer 2

您应该ItemTemplate正确定义：

<ScrollViewer>
    <ItemsControl ItemsSource="{Binding myList}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Text}" />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</ScrollViewer>