我将WinUI与microsoft MVVM工具包结合使用。但是，我遇到一些绑定问题，不知道问题出在哪里。
ViewModel和ViewModel中使用的模型属于observableObject类型。Command被触发，数据被获取。但是，绑定不会在UI中显示结果，除非我更改xaml并热重新加载更改。
我的页面:
<Page
x:Class="ThrustmasterGuide.Pages.WheelBasePage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:ThrustmasterGuide.Pages"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:model="using:ThrustmasterGuide.DataAccess.Context.Model"
xmlns:wheelbase="using:ThrustmasterGuide.ViewModel.Wheelbase"
xmlns:xaml="using:ABI.Microsoft.UI.Xaml"
xmlns:b="http://schemas.microsoft.com/xaml/behaviors"
xmlns:core="using:Microsoft.Xaml.Interactions.Core"
xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
xmlns:converters="using:ThrustmasterGuide.Converters"
xmlns:wheelBase="using:ThrustmasterGuide.Model.WheelBase"
mc:Ignorable="d"
d:DataContext="{d:DesignInstance wheelbase:WheelBaseViewModel, IsDesignTimeCreatable=True}">
<Page.Resources>
<converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
<converters:InvertBoolToVisibilityConverter x:Key="InvertBoolToVisibilityConverter" />
</Page.Resources>
<interactivity:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="Loaded">
<core:EventTriggerBehavior.Actions>
<core:InvokeCommandAction Command="{x:Bind ViewModel.LoadWheelBaseCommand}" />
</core:EventTriggerBehavior.Actions>
</core:EventTriggerBehavior>
</interactivity:Interaction.Behaviors>
<StackPanel Padding="16 16 16 16" Orientation="Vertical">
<StackPanel>
<TextBlock FontSize="18" Text="{x:Bind ViewModel.WheelBase.Name}" />
<TextBlock FontSize="18" Text="Symptomen:" />
<TextBlock Text="Kies hieronder een symptoom uit om te starten." />
<ProgressRing IsActive="true"
Visibility="{x:Bind ViewModel.LoadWheelBaseCommand.IsRunning, Converter={StaticResource BoolToVisibilityConverter}}" />
<TreeView ItemsSource="{x:Bind ViewModel.WheelBase.Symptoms, Mode=OneWay}">
<TreeView.ItemTemplate>
<DataTemplate x:DataType="wheelBase:SymptomModel">
<TreeViewItem ItemsSource="{x:Bind Children}" Content="{x:Bind Description}" />
</DataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</StackPanel>
<Button VerticalAlignment="Bottom" Command="{x:Bind ViewModel.LoadWheelBaseCommand}"
Content="Refresh">
</Button>
</StackPanel>
我的视图模型:
public class WheelBaseViewModel : ObservableRecipient
{
public WheelBaseModel WheelBase { get; set; }
public string WheelBaseName { get; set; }
private readonly WheelBaseService _wheelBaseService;
public IAsyncRelayCommand LoadWheelBaseCommand { get; }
public WheelBaseViewModel(WheelBaseService wheelBaseService)
{
_wheelBaseService = wheelBaseService;
LoadWheelBaseCommand = new AsyncRelayCommand(FetchWheelBase);
}
public async Task FetchWheelBase()
{
WheelBase = await _wheelBaseService.GetWheelBase(WheelBaseName);
}
}
我的模型:
namespace ThrustmasterGuide.Model.WheelBase
{
public class WheelBaseModel : ObservableObject
{
public string Name { get; set; }
public ObservableCollection<SymptomModel> Symptoms { get; set; }
}
}
My Code behind:
public sealed partial class WheelBasePage : Page
{
public WheelBasePage()
{
this.InitializeComponent();
this.DataContext = App.Current.Services.GetService<WheelBaseViewModel>();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
this.ViewModel.WheelBaseName = e.Parameter as string;
}
public WheelBaseViewModel ViewModel => (WheelBaseViewModel)DataContext;
}
它是什么，我错过了使UI绑定到WheelBaseModel值?
我添加了mode=OneWay，但仍然没有更新。
应该注意到我在内容框架中显示的页面在导航之后吗?
{x:Bind}的默认模式是OneTime，而{Binding}的默认模式是OneWay。
我相信你需要使用SetProperty所以它知道什么时候引发这样的事件?
https://learn.microsoft.com/en-us/windows/communitytoolkit/mvvm/observableobject
namespace ThrustmasterGuide.Model.WheelBase
{
public class WheelBaseModel : ObservableObject
{
public string Name
{
get => name;
set => SetProperty(ref name, value);
}
public ObservableCollection<SymptomModel> Symptoms { get; set; }
}
和bind mode = OneWay
<TextBlock FontSize="18" Text="{x:Bind ViewModel.WheelBase.Name, Mode=OneWay}" />
没有指示您的属性通知它们的更改
https://learn.microsoft.com/dotnet/api/system.componentmodel.inotifypropertychanged