TabbedPage 内的 Xamarin Forms ListView 未使用 ObservableCollection 更新

Question

我的XAML 文件的ListView 被一个ViewModel 填充，该ViewModel 具有来自服务的ObservableCollection，但ListView 没有更新信息。我已经检查了该服务是否返回了正确的信息。

XML：

<ListView x:Name="DashboardDetailsList" 
            SelectionMode="None" 
            HasUnevenRows="True" 
            ItemsSource="{Binding DetailsList}"
            BackgroundColor="Transparent" 
            VerticalOptions="FillAndExpand" 
            SeparatorVisibility="None">
   <ListView.ItemTemplate>
       <DataTemplate>
           <ViewCell>
              ...
              ...
           </ViewCell>
       </DataTemplate>
   </ListView.ItemTemplate>
</ListView>

代码：

public ObservableCollection<Dashboard> DetailsList { get; set; } = new ObservableCollection<Dashboard>();
//API Call
details = await _clientAPI.getDashboardDetails(id);
if (details != null)
{
    DetailsList.Clear();
    foreach (var item in details)
    {
        DetailsList.Add(item);
    }
}

Answer 1

试试这个人

public ObservableCollection<Dashboard> DetailsList { get; set; } = new ObservableCollection<Dashboard>();
//API Call
details = await _clientAPI.getDashboardDetails(id);
if (details != null)
{
    DetailsList = details;
}

Answer 2

对不起，伙计..您在使用 MVVM 吗？

您需要通知变量已更改。

这样

private ObservableCollection <Dashboard> _detailsList;
public ObservableCollection <Dashboard> DetailsList
{
    get => _detailsList;
    private set => SetProperty (ref _detailsList, value);
}

//API Call
details = await _clientAPI.getDashboardDetails(id);
if (details != null)
{
    DetailsList = details;
}