我正在编写一个小型的UWP项目,也使用MVVM模式(MVVM轻型框架)进行我的研究,并遇到了许多场景和控件中的绑定问题。ProgressRing IsActive属性未更新
我已经努力将其中的一个隔离到可用的迷你示例项目here。
ProgressRing控制的IsActive属性未反应在甚至通过它从视图模型侧更新具有:
- INotifyPropertyChanged的实施
- 装订模式明确设置为双向绑定
- UpdateSourceTrigger明确设置为的PropertyChanged
MainPage.xaml
个<Page
x:Class="TestProgressRing.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:core="using:Microsoft.Xaml.Interactions.Core"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:i="using:Microsoft.Xaml.Interactivity"
xmlns:local="using:TestProgressRing"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Width="491.282"
Height="492.308"
DataContext="{Binding MainPageViewModel, Source={StaticResource ResourceKey=Locator}}"
mc:Ignorable="d">
<Grid
Width="500"
Height="800"
Margin="0,0,-8.667,-307.667"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="3*" />
</Grid.RowDefinitions>
<Button
Grid.Row="0"
Width="250"
Height="50"
Margin="0"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Content="Boom">
<i:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="Click">
<core:InvokeCommandAction Command="{Binding ClickCommand}" />
</core:EventTriggerBehavior>
</i:Interaction.Behaviors>
</Button>
<ProgressRing
Grid.Row="1"
Width="500"
Height="500"
Margin="0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
IsActive="{Binding IsLoading, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
Visibility="Visible" />
</Grid>
</Page>
MainPageViewModel.cs
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace TestProgressRing
{
public class MainPageViewModel : ViewModelBase
{
private bool _isLoading;
public bool IsLoading
{
get => _isLoading;
set
{
_isLoading = value;
Set(() => IsLoading, ref _isLoading, value);
}
}
public ICommand ClickCommand { get; set; }
public MainPageViewModel()
{
ClickCommand = new RelayCommand(() =>
IsLoading = !IsLoading);
}
}
}
是否UWP控制只是单纯的不正规的结合,而不是X行之有效:绑定?还有更多的问题,例如CalendarPickerView Date属性也不想合作。
这是iss UE。谢谢 :) –