无法找到带引用的绑定源...数据绑定ListView问题

I know that there have been questions regarding this error, I've found some and read them but to be honest, I didn't understand a thing.

我知道有关于这个错误的问题,我找到了一些并阅读了它们,但说实话,我不明白一件事。

I have a WPF window with two databound ListViews. One is bound to business objects (my custom classes), another to a Dictionary<string, string>. Everything seems to look OK in runtime, but I'm getting errors in the Output window:

我有一个带有两个数据绑定ListViews的WPF窗口。一个绑定到业务对象(我的自定义类),另一个绑定到Dictionary 。一切似乎在运行时看起来都不错,但我在输出窗口中出现错误: ,string>

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=HorizontalContentAlignment; DataItem=null; target element is 'ListViewItem' (Name=''); target property is 'HorizontalContentAlignment' (type 'HorizontalAlignment')

System.Windows.Data错误:4:无法找到与引用'RelativeSource FindAncestor绑定的源,AncestorType ='System.Windows.Controls.ItemsControl',AncestorLevel ='1''。 BindingExpression:路径= HorizontalContentAlignment;的DataItem = NULL; target元素是'ListViewItem'(Name =''); target属性是'HorizontalContentAlignment'(类型'HorizontalAlignment')

and the same for VerticalContentAlignment.

和VerticalContentAlignment相同。

Even though bost ListViews get populated with items as expected, it actually causes a noticeable delay when loading the window.

尽管bost ListViews按预期填充了项目,但实际上在加载窗口时会导致明显的延迟。

Looking for an answer, I found this thread http://social.msdn.microsoft.com/Forums/en/wpf/thread/f3549b2b-5342-41a1-af04-d55e43c48768 - and I implemented the suggested solution, supplying default values of both HorizontalContentAlignment and VerticalContentAlignment in both ListViews. It didn't help.

寻找答案,我找到了这个主题http://social.msdn.microsoft.com/Forums/en/wpf/thread/f3549b2b-5342-41a1-af04-d55e43c48768 - 我实现了建议的解决方案,提供默认值两个ListView中的HorizontalContentAlignment和VerticalContentAlignment。它没有帮助。

Here's the XAML:

这是XAML:

ListView 1:

                <ListView Margin="15,50,15,15" Name="lvLanguageCodes" FontSize="13" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
                    <ListView.Resources>
                        <Style TargetType="ListViewItem">
                            <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                            <Setter Property="VerticalContentAlignment" Value="Stretch" />
                        </Style>
                    </ListView.Resources>
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <UniformGrid Columns="3" />
                        </ItemsPanelTemplate>
                    </ListView>

ListView 1: ItemsPanelTemplate> 的ListView>

ListView 2

                        <ListView.Resources>
                            <Style TargetType="ListViewItem">
                                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                                <Setter Property="VerticalContentAlignment" Value="Stretch" />
                                <EventSetter Event="Selected" Handler="lvItemSelected" />
                            </Style>
                            <Style x:Key="GrayOutMappedColumn" TargetType="{x:Type TextBlock}">
                                <Style.Triggers>
                                    <DataTrigger Binding="{Binding Mapped}" Value="False">
                                        <Setter Property="TextElement.Foreground" Value="Black" />
                                    </DataTrigger>
                                </Style.Triggers>
                                <Setter Property="TextElement.Foreground" Value="DarkGray" />
                            </Style>
                        </ListView.Resources>
                        <ListView.GroupStyle>
                            <GroupStyle>
                                <GroupStyle.HeaderTemplate>
                                    <DataTemplate>
                                        <Border BorderBrush="LightGray" BorderThickness="0,0,0,1">
                                            <TextBlock FontSize="12" FontWeight="Bold" Margin="0,10" Text="{Binding Name}" />
                                        </Border>
                                    </DataTemplate>
                                </GroupStyle.HeaderTemplate>
                            </GroupStyle>
                        </ListView.GroupStyle>
                        <ListView.ItemsPanel>
                            <ItemsPanelTemplate>
                                <UniformGrid Columns="4" />
                            </ItemsPanelTemplate>
                        </ListView.ItemsPanel>
                        <ListView.ItemTemplate>
                            <DataTemplate>
                                <StackPanel ClipToBounds="False" HorizontalAlignment="Stretch" Width="Auto">
                                    <TextBlock HorizontalAlignment="Stretch" Style="{StaticResource GrayOutMappedColumn}" Text="{Binding Path=FriendlyName}" Width="Auto" />
                                </StackPanel>
                            </DataTemplate>
                        </ListView.ItemTemplate>

ListView 2 边框> DataTemplate中> GroupStyle> ItemsPanelTemplate> StackPanel中> DataTemplate中>

Data-binding code:

lvLanguageCodes.ItemsSource = languages;
lvLanguageCodes.SelectedValuePath = "Key";
lvLanguageCodes.DisplayMemberPath = "Value";

lvDataTypes.ItemsSource = AssignDataType.datatypes;

where datatypes is ObservableCollection<Gate>, where Gate is my business class (implementing INotifyPropertyChanged, IComparable and nothing special about it otherwise).

其中数据类型是ObservableCollection ,其中Gate是我的业务类(实现INotifyPropertyChanged,IComparable,否则没什么特别之处)。

Why am I getting an error? Why is it trying to bind these alignment properties to anything at all, if I set their values explicitly?

为什么我收到错误?如果我明确设置它们的值,为什么要尝试将这些对齐属性绑定到任何东西?

2 个解决方案

#1

You need to override the default ItemContainerStyle. So Blam's answer is half-correct. Here is mine:

您需要覆盖默认的ItemContainerStyle。所以Blam的回答是半正确的。这是我的:

<Style x:Key="ListBoxItemStyle" TargetType="ListBoxItem">
    <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
    <Setter Property="OverridesDefaultStyle" Value="True"/>
    <Setter Property="SnapsToDevicePixels" Value="True"/>
    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
    <Setter Property="Template">
        <Setter.Value>
    ...
</Style>

<ListBox ItemContainerStyle="{StaticResource ListBoxItemStyle}"

#2

Try below. Not sure it will work in your environment but this is the syntax that is working for me.

试试以下。不确定它是否适用于您的环境,但这是适用于我的语法。

    <ListView.Resources>
            <Style TargetType="{x:Type ListViewItem}">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                <Setter Property="VerticalContentAlignment" Value="Stretch" />
            </Style>

It may be a a data binding issue. Could you try?

它可能是一个数据绑定问题。你能试试吗?

    <ListView Margin="15,50,15,15" Name="lvLanguageCodes" FontSize="1" 
              PresentationTraceSources.TraceLevel="High" 
              DisplayMemberPath="Value" SelectedValuePath="Key" ItemsSource="Langages">
        <ListView.Resources>
            <Style TargetType="ListViewItem">
                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                <Setter Property="VerticalContentAlignment" Value="Stretch" />
            </Style>
        </ListView.Resources>
    </ListView>

You do know ListView.ItemsPanel is not closed out. I am surprised this compiles.

你知道ListView.ItemsPanel没有关闭。我很惊讶这个编译。

#1