Xaml 产生路径错误，但有些仍然有效

Question

我遇到过绑定路径错误的情况。但是，一些绑定仍然有效，而另一些则无效。我有以下类（copy/pasted 只有相关位）：

后面的代码：

class RSSManager : BaseViewModel
{
    #region Resources
    private Platforms _platformsList;

    public Platforms PlatformsList
    {
        get { return _platformsList; }
        set
        {
            _platformsList = value;
            NotifyPropertyChanged("PlatformsList");
        }
    }

    private List<IActivity> _mainActivitiesList = new List<IActivity>();

    public List<IActivity> MainActivitiesList
    {
        get { return _mainActivitiesList; }
        set
        {
            _mainActivitiesList = value;
            NotifyPropertyChanged("MainActivitiesList");
        }
    }

    private ObservableCollection<IActivity> _activitiesList = new ObservableCollection<IActivity>();

    public ObservableCollection<IActivity> ActivitiesList
    {
        get { return _activitiesList; }
        set
        {
            _activitiesList = value;
            NotifyPropertyChanged("ActivitiesList");
        }
    }

    private ObservableCollection<IActivity> _alertsList = new ObservableCollection<IActivity>();

    public ObservableCollection<IActivity> AlertsList
    {
        get { return _alertsList; }
        set
        {
            _alertsList = value;
            NotifyPropertyChanged("AlertsList");
        }
    }

    private ObservableCollection<IActivity> _invasionsList = new ObservableCollection<IActivity>();

    public ObservableCollection<IActivity> InvasionsList
    {
        get { return _invasionsList; }
        set
        {
            _invasionsList = value;
            NotifyPropertyChanged("InvasionsList");
        }
    }

    private ObservableCollection<IActivity> _outbreaksList = new ObservableCollection<IActivity>();

    public ObservableCollection<IActivity> OutbreaksList
    {
        get { return _outbreaksList; }
        set
        {
            _outbreaksList = value;
            NotifyPropertyChanged("OutbreaksList");
        }
    }

    private ObservableCollection<IActivity> _doneList = new ObservableCollection<IActivity>();

    public ObservableCollection<IActivity> DoneList
    {
        get { return _doneList; }
        set
        {
            _doneList = value;
            NotifyPropertyChanged("DoneList");
        }
    }

    #endregion

}

    public partial class Activities : Page, IOptions
{
    Options.OptionsActivities _options = new Options.OptionsActivities();

    RSSManager _manager = new RSSManager();

    public Activities()
    {
        InitVars();
        InitializeComponent();
        DataContext = _manager;
        UpdateCheckBoxes();
        UpdateTabsHeaders();
    }

}

Activities.xaml :

<Page x:Class="Warframe_Activity_Manager.Views.Activities"
  DataContext="{Binding Source={RelativeSource Self}}"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
  mc:Ignorable="d" 
  d:DesignHeight="718" d:DesignWidth="1024"
  GotFocus="Page_GotFocus"
Title="Activities">

<Grid Name="MainGrid" Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="30" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <StackPanel Name="PlatformChoices" Orientation="Horizontal" Background="Transparent">
        <Label Name="ChoicePCLabel" Content="Show PC Activities" Foreground="Aqua" VerticalAlignment="Center"></Label>
        <CheckBox Name="ChoicePC" VerticalAlignment="Center" Click="Platform_Click"/>
        <Label Name="ChoicePS4Label" Content="Show PlayStation 4 Activities" Foreground="Aqua" VerticalAlignment="Center"></Label>
        <CheckBox Name="ChoicePS4" VerticalAlignment="Center" Click="Platform_Click"/>
        <Label Name="ChoiceXB1Label" Content="Show XBox One Activities" Foreground="Aqua" VerticalAlignment="Center"></Label>
        <CheckBox Name="ChoiceXB1" VerticalAlignment="Center" Click="Platform_Click"/>
    </StackPanel>
    <Button Name="Refresh" HorizontalAlignment="Right" Content="Refresh" Click="Refresh_Click"/>
    <TabControl Name="Tabs" Grid.Row="1" Background="Transparent">
        <TabItem Name="TabAll" Header="All Activities" BorderThickness="0">
            <ListView Name="ListAll" Background="Transparent" ItemsSource="{Binding ActivitiesList}" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="1*"/>
                                <ColumnDefinition Width="1*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="1*"/>
                                <RowDefinition Height="1*"/>
                            </Grid.RowDefinitions>
                            <StackPanel Name="ActivityTypeContainer" Orientation="Horizontal" HorizontalAlignment="Left">
                                <Label Name="ActivityTypeLabel" VerticalAlignment="Center" Foreground="Red" Content="Activity Type :"/>
                                <Label Name="ActivityType" VerticalAlignment="Center" Foreground="Red" Content="{Binding Path=Type}"/>
                            </StackPanel>
                            <StackPanel Name="ActivityPlatformContainer" Grid.Column="1" Orientation="Horizontal" HorizontalAlignment="Right" Margin="0, 0, 10, 0">
                                <Label Name="ActivityPlatformLabel"  VerticalAlignment="Center" Foreground="Blue" Content="Platform :"/>
                                <Label  Name="ActivityPlatform" VerticalAlignment="Center" Foreground="Blue" Content="{Binding Path=Platform}"/>
                            </StackPanel>
                            <StackPanel Name="ActivityInfoContainer" Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Left">
                                <Label Name="ActivityInfoLabel" VerticalAlignment="Center" Foreground="Orange" Content="Activity Information : "/>
                                <Label Name="ActivityInfo" VerticalAlignment="Center" Foreground="Orange" Content="{Binding Path=Info}"/>
                            </StackPanel>
                            <StackPanel Name="ActivityDoneContainer" Grid.Column="1" Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right"  Margin="0, 0, 10, 0">
                                <Label Name="ActivityDoneLabel" VerticalAlignment="Center" Foreground="Green" Content="Finished : "/>
                                <CheckBox Name="ActivityDone" VerticalAlignment="Center" IsChecked="{Binding Path=Done, Mode=TwoWay}" Click="ActvityDone_Click"/>
                            </StackPanel>
                        </Grid>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </TabItem>
    </TabControl>
</Grid>

错误：

System.Windows.Data Error: 40 : BindingExpression path error: 'ActivitiesList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=ActivitiesList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListAll'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'AlertsList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=AlertsList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListAlerts'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'InvasionsList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=InvasionsList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListInvasions'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'OutbreaksList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=OutbreaksList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListOutbreaks'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'DoneList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=DoneList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListDone'); target property is 'ItemsSource' (type 'IEnumerable')

我还没有接触到因式分解模板部分，但我认为这不是这里的问题。

如前所述，即使我收到错误，程序也显示了我想要的内容。但是，我接下来添加的绑定根本无法使用给出相同错误类型（错误路径）的输出。我在这里做错了什么？

Answer 1

您正在 XAML 和构造函数中设置 DataContext。

删除 XAML 中的 DataContext 行，因为这会导致输出错误：

DataContext="{Binding Source={RelativeSource Self}}"

如果绑定失败，应用程序不会引发任何错误并停止应用程序，但会在输出中显示它们。

我发现在运行应用程序之前查看任何绑定错误的一个好方法是检查智能感知是否正常工作。如果是，那么您应该可以开始了。

Xaml 产生路径错误，但有些仍然有效

Xaml producing path errors but some still work

c#

wpf

xaml

binding