我有一个View只是一个ListBox或ItemsControl（试过两个）我试图从ViewModel向ListBox添加多个usercontrol实例。我正在尝试这个：
我在Main ViewModel中有一个UserControl ViewModel的ObservableCollection。
<Controls:MetroWindow.Resources>
<DataTemplate x:Key="{x:Type local2:TorrentControlViewModel}">
<local:TorrentControl />
</DataTemplate>
<ItemsControl ItemsSource="{Binding TorrentControlViewModels}" VerticalAlignment="Top">
我得到的只是ListBox中的一个字符串： Namespace.ViewModels.TorrentControlViewModel
Binding似乎有效，但UserControl从未初始化。 我需要在列表框中添加未知数量的这些控件。
(WPF MVVM) How to add a user control to a View from a collection in a ViewModel
控制
<UserControl x:Class="Music.Views.TorrentControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
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:Music"
xmlns:converters="clr-namespace:Music.Converters"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:behaviors="clr-namespace:Music.Behaviors"
mc:Ignorable="d" d:DesignWidth="900" Height="300" Width="Auto">
<UserControl.Resources>
<Style x:Key="ButtonHype" TargetType="{x:Type Hyperlink}">
<Setter Property="TextDecorations" Value="None" />
</Style>
<converters:BoolToVisibilityConverter x:Key="BoolToVisConverter" />
<converters:ReverseBooleanConverter x:Key="ReverseBooleanConverter" />
<Style x:Key="ListBoxItemStyle1" TargetType="{x:Type ListBoxItem}">
<Setter Property="Background" Value="Transparent" />
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment,
RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
<Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment,
RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
<Setter Property="Padding" Value="2,0,0,0" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"
Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" Value="Transparent" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Grid VerticalAlignment="Top" Width="Auto" Height="Auto" MinWidth="400" x:Name="MainGrid">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" MaxHeight="40" />
<RowDefinition Height="Auto" />
<RowDefinition Height="100" />
<!--<RowDefinition Height="Auto" />-->
<!--<RowDefinition Height="Auto" />-->
</Grid.RowDefinitions>
<Image HorizontalAlignment="Center" Grid.Row="0" Grid.Column="0"
Source="{Binding RootSource}" RenderOptions.BitmapScalingMode="HighQuality" Height="30"
Margin="10,0,10,0" Stretch="Uniform"
RenderTransformOrigin=".5,.5" Cursor="Hand" VerticalAlignment="Center">
<Image.RenderTransform>
<RotateTransform x:Name="AnimatedRotateTransform" Angle="0" />
</Image.RenderTransform>
<Image.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetName="AnimatedRotateTransform"
Storyboard.TargetProperty="Angle"
By="0"
To="360"
Duration="0:0:0.3"
RepeatBehavior="2x"
FillBehavior="Stop" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Image.Triggers>
</Image>
<!--<Viewbox Stretch="UniformToFill" StretchDirection="Both" Grid.Row="0" Grid.Column="1">-->
<TextBlock x:Name="TorrentNameText" HorizontalAlignment="Left" Grid.Row="0" Grid.Column="1"
Text="{Binding TorrentName}" VerticalAlignment="Center" Grid.ColumnSpan="1"
Margin="4,-5,0,0" TextTrimming="CharacterEllipsis"
FontSize="26" Width="Auto" Foreground="White">
<TextBlock.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="TorrentNameText"
Storyboard.TargetProperty="(UIElement.Opacity)"
From="0.0" To="1" Duration="0:0:4"
AutoReverse="False" RepeatBehavior="1x" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</TextBlock.Triggers>
</TextBlock>
<!--</Viewbox>-->
<!--<Rectangle x:Name="LineRect" Height="2" VerticalAlignment="Bottom" Fill="Gray" Grid.Row="2" Grid.RowSpan="3"
Margin="-1000,0,0,0" Grid.Column="2" Grid.ColumnSpan="2" Visibility="Collapsed">
</Rectangle>-->
<Border x:Name="CDImageBorder" BorderBrush="#F80271" BorderThickness="2" Grid.Row="0" Grid.Column="2"
MaxHeight="175" HorizontalAlignment="Left" VerticalAlignment="Top" Grid.RowSpan="3"
Width="Auto"
Margin="44,0,0,0" Visibility="Visible">
<Border.Effect>
<DropShadowEffect Opacity="50" Color="#FF9933" BlurRadius="10" />
</Border.Effect>
<Image x:Name="CDImage" Grid.Row="0" Grid.Column="3"
RenderOptions.BitmapScalingMode="HighQuality" Height="175"
Stretch="Uniform" HorizontalAlignment="Left" Margin="0,0,0,0"
RenderTransformOrigin=".5,.5" VerticalAlignment="Top" Grid.RowSpan="3"
Source="{Binding CDImageSource}" Visibility="Visible" />
</Border>
<Controls:ProgressRing x:Name="ProgressRing" Grid.Row="0" Grid.Column="2" Height="38" Width="40"
IsActive="{Binding IsWorking}" Foreground="#F80271" Margin="30,4,0,0" HorizontalAlignment="Left" />
<ListBox Grid.Row="2" Grid.Column="1" Width="Auto"
Margin="0 0 0 0" ScrollViewer.VerticalScrollBarVisibility="Auto" Height="Auto"
ItemContainerStyle="{DynamicResource ListBoxItemStyle1}" ItemsSource="{Binding SubDirectories}">
<i:Interaction.Behaviors>
<behaviors:ScrollIntoViewBehavior />
</i:Interaction.Behaviors>
<ListBox.Style>
<Style TargetType="{x:Type ItemsControl}">
<Style.Resources>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="FocusVisualStyle" Value="{x:Null}" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderBrush" Value="Transparent" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Grid Margin="0,0,0,0">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1"
SnapsToDevicePixels="True" />
<ContentPresenter Margin="8,5" />
</Grid>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True" />
</MultiTrigger.Conditions>
<Setter Property="Background" Value="#F80271" />
<Setter Property="BorderBrush" Value="Black" />
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Style.Resources>
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<StackPanel>
<i:Interaction.Behaviors>
<ei:FluidMoveBehavior AppliesTo="Children" Duration="00:00:00.3">
<ei:FluidMoveBehavior.EaseX>
<CircleEase EasingMode="EaseOut" />
</ei:FluidMoveBehavior.EaseX>
</ei:FluidMoveBehavior>
</i:Interaction.Behaviors>
</StackPanel>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.Style>
<!--<ListBoxItem>
</ListBoxItem>-->
</ListBox>
<StackPanel Grid.Column="1" Grid.Row="1" Background="Transparent" Height="Auto" Width="Auto"
Grid.ColumnSpan="1" Orientation="Horizontal" Margin="10,0,0,0"/>
<Grid Width="Auto" Grid.Column="1" Grid.Row="1" Margin="5,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Image Grid.Row="0" Grid.Column="0"
RenderOptions.BitmapScalingMode="HighQuality" Height="25" ToolTip="Torrent Complete"
Stretch="Uniform" HorizontalAlignment="Left" Margin="0,0,0,0"
RenderTransformOrigin=".5,.5" VerticalAlignment="Center"
Visibility="Visible" Source="{Binding CheckSource}"/>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="1"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="2"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="3"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="4"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="5"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="6"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
<TextBlock DockPanel.Dock="Top" Grid.Row="0" Grid.Column="7"><Hyperlink Command="{Binding UTorrentClientControlCommands}" Style="{StaticResource ButtonHype}"
CommandParameter="StartTorrent" ><InlineUIContainer>
<Image Source="{Binding StartSource}" VerticalAlignment="Center" Stretch="Uniform"
RenderOptions.BitmapScalingMode="HighQuality" RenderTransformOrigin=".5,.5"
ToolTip="Start Torrent" HorizontalAlignment="Center"
Margin="0,10,0,0" Height="32" />
</InlineUIContainer></Hyperlink></TextBlock>
</Grid>
<StackPanel />
</Grid>
答案 0 :(得分：3)
您只需告诉Framework，您的DataTemplate适用于您指定的数据类型：
<DataTemplate DataType="{x:Type local2:TorrentControlViewModel}">
<local:TorrentControl />
</DataTemplate>
现在，当它看到您的数据类型的对象时，它会找到DataTemplate（只要它在范围内声明）并呈现UserControl。