这个问题在这里已有答案：
我正在尝试用一些UserControls填充ItemsControl，但我无法找到哪个祖先应该匹配数据模板中的项目。
我已经尝试用x：Name属性绑定，结果是一样的。我也尝试使用和不使用RelativeSource进行绑定，但我也没有任何成功。
用户控制XAML
<UserControl x:Class="FireAntTempConfigurer.UserControls.CommandButton_UC"
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"
xmlns:local="clr-namespace:FireAntTempConfigurer.UserControls"
xmlns:materialDesign="clr-namespace:MaterialDesignThemes.Wpf;assembly=MaterialDesignThemes.Wpf"
mc:Ignorable="d"
TextElement.Foreground="{DynamicResource MaterialDesignPaper}"
d:DesignHeight="50 " d:DesignWidth="50"
>
<Grid>
<Button Height="50" Padding="0,0,0,0" ToolTip="{Binding Path=Placeholder, RelativeSource={RelativeSource AncestorType=UserControl}}">
<Button.Content>
<materialDesign:PackIcon Kind="{Binding Path=Icon, RelativeSource={RelativeSource AncestorType=UserControl}}" Height="50" Width="50" />
</Button.Content>
</Button>
</Grid>
</UserControl>
用户控制代码背后
/// <summary>
/// Interaction logic for CommandButton_UC.xaml
/// </summary>
public partial class CommandButton_UC : UserControl
{
public CommandButton_UC()
{
this.DataContext = this;
InitializeComponent();
}
public string Icon
{
get { return (string)GetValue(IconProperty); }
set { SetValue(IconProperty, value); }
}
// Using a DependencyProperty as the backing store for Icon. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IconProperty =
DependencyProperty.Register("Icon", typeof(string), typeof(CommandButton_UC), new PropertyMetadata("EmoticonDead"));
public string Placeholder
{
get { return (string)GetValue(PlaceholderProperty); }
set { SetValue(PlaceholderProperty, value); }
}
// Using a DependencyProperty as the backing store for Placeholder. This enables animation, styling, binding, etc...
public static readonly DependencyProperty PlaceholderProperty =
DependencyProperty.Register("Placeholder", typeof(string), typeof(CommandButton_UC), new PropertyMetadata("fail to load"));
}
主窗口XAML
<Window x:Class="FireAntTempConfigurer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:FireAntTempConfigurer"
xmlns:materialDesign="clr-namespace:MaterialDesignThemes.Wpf;assembly=MaterialDesignThemes.Wpf"
xmlns:uc="clr-namespace:FireAntTempConfigurer.UserControls"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800"
TextElement.Foreground="{DynamicResource SecondaryAccentBrush}"
Background="{DynamicResource MaterialDesignPaper}"
TextElement.FontWeight="Medium"
TextElement.FontSize="20"
FontFamily="pack://application:,,,/MaterialDesignThemes.Wpf;component/Resources/Roboto/#Roboto"
x:Name="mw">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="95*"/>
<ColumnDefinition Width="169*"/>
<ColumnDefinition Width="95*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="150"/>
<RowDefinition Height="50"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<materialDesign:Card Grid.Column="1" Grid.Row="1">
<StackPanel Margin="0">
<TextBlock>ToolBox:</TextBlock>
<Separator Margin="0"></Separator>
<ItemsControl ItemsSource="{Binding Path=MyPropertyList, RelativeSource={RelativeSource AncestorType=Window}}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Height="50" HorizontalAlignment="Left" Margin="5,0,0,0" IsItemsHost="True"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate >
<DataTemplate>
<uc:CommandButton_UC Padding="0,0,0,0" Margin="0,0,5,0"
Icon="{Binding Path=IconProp, RelativeSource={RelativeSource AncestorType=ItemsControl}}"
Placeholder="{Binding Path=PlaceHolderProp , RelativeSource={RelativeSource AncestorType=ItemsControl}}">
</uc:CommandButton_UC>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
.
.
.
主窗口代码背后
public partial class MainWindow : Window
{
public CommandButtonViewModel MyProperty { get; set; }
public BindingList<CommandButtonViewModel> MyPropertyList { get; set; }
public MainWindow()
{
MyPropertyList = new BindingList<CommandButtonViewModel>();
MyProperty = new CommandButtonViewModel { IconProp = "PlusCircleOutline", PlaceHolderProp = "Add" };
BindingList<CommandButtonViewModel> tempList = new BindingList<CommandButtonViewModel>();
tempList.Add(MyProperty);
tempList.Add(MyProperty);
MyPropertyList = tempList;
DataContext = this;
InitializeComponent();
}
现在我在输出端收到消息：
System.Windows.Data Error: 40 : BindingExpression path error: 'IconProp' property not found on 'object' ''CommandButton_UC' (Name='')'. BindingExpression:Path=IconProp; DataItem='CommandButton_UC' (Name=''); target element is 'CommandButton_UC' (Name=''); target property is 'Icon' (type 'String')
System.Windows.Data Error: 40 : BindingExpression path error: 'IconProp' property not found on 'object' ''CommandButton_UC' (Name='')'. BindingExpression:Path=IconProp; DataItem='CommandButton_UC' (Name=''); target element is 'CommandButton_UC' (Name=''); target property is 'Icon' (type 'String')
System.Windows.Data Error: 40 : BindingExpression path error: 'PlaceHolderProp' property not found on 'object' ''ItemsControl' (Name='')'. BindingExpression:Path=PlaceHolderProp; DataItem='ItemsControl' (Name=''); target element is 'CommandButton_UC' (Name=''); target property is 'Placeholder' (type 'String')
System.Windows.Data Error: 40 : BindingExpression path error: 'PlaceHolderProp' property not found on 'object' ''ItemsControl' (Name='')'. BindingExpression:Path=PlaceHolderProp; DataItem='ItemsControl' (Name=''); target element is 'CommandButton_UC' (Name=''); target property is 'Placeholder' (type 'String')
会感激一些帮助
我无法完全复制你的代码，因为我没有materialdesignlibrary，但我认为我可以重现你的情况，用普通的wpf控件替换那些引用。在我看来，你必须执行以下步骤：
public class CommandButtonViewModel : INotifyPropertyChanged
{
private string _iconprop;
public string IconProp
{
get
{
return _iconprop;
}
set
{
_iconprop = value;
NotifyPropertyChanged("IconProp");
}
}
private string _placeholderprop;
public string PlaceHolderProp
{
get
{
return _placeholderprop;
}
set
{
_placeholderprop = value;
NotifyPropertyChanged("PlaceHolderProp");
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
您的DataContext只是主窗口，因此从CommandButton_UC的创建者中删除DataContext集
public partial class CommandButton_UC : UserControl
{
public CommandButton_UC()
{
InitializeComponent();
}
}
在绑定中，您可以直接绑定到CommandButtonViewModel属性
所以你必须以这种方式修改CommandButton_UC：
<ItemsControl
ItemsSource="{Binding Path=MyPropertyList,
RelativeSource {RelativeSource AncestorType=Window}}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel
Orientation="Horizontal"
Height="50"
HorizontalAlignment="Left"
Margin="5,0,0,0" IsItemsHost="True"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate >
<DataTemplate>
<uc:CommandButton_UC
Padding="0,0,0,0" Margin="0,0,5,0"
Icon="{Binding Path=IconProp}"
Placeholder="{Binding Path=PlaceHolderProp}">
</uc:CommandButton_UC>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>