没有显示设计时数据？

Question

Visual Studio 2013 XAML编辑器不显示我的虚拟数据。 如果将makeDummy = true设置并运行， makeDummy = true看到相应的数据（两个字段，带有正确的标签）。 但是它没有在设计器中显示。 如何在设计模式下查看虚拟数据？

public partial class InputDialog : Window {
    public ObservableCollection<KeyValueViewModel> Items { get; set; }

    public InputDialog(){
        bool makeDummy = DesignerProperties.GetIsInDesignMode(this);
        if (makeDummy) {
            Items = new ObservableCollection<KeyValueViewModel>()               {
                new KeyValueViewModel() {Key = "Top:"},
                new KeyValueViewModel() {Key = "Middleton:"}
            };
        }
        InitializeComponent();
    }

    private void CancelButton_Click(object sender, RoutedEventArgs e) { DialogResult = false; }
    private void OkButton_Click(object sender, RoutedEventArgs e) { DialogResult = true; }
}

请忽略属性，接口继承，事件和方法-它们只是实现INotifyPropertyChanged所需的行为：

[NotifyPropertyChangedAspect]
public class KeyValueViewModel : IRetrievableNotifyPropertyChanged{
    public string Value { get; set; }
    public string Key { get; set; }
    public event PropertyChangedEventHandler PropertyChanged;
    public PropertyChangedEventHandler GetPropertyChangedEventHandler() { return PropertyChanged; }
}

这是XAML：

<Window x:Class="Dre.InputDialog"
        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" 
        mc:Ignorable="d"
        DataContext="{Binding RelativeSource={RelativeSource Self}}"
        d:DataContext="{Binding RelativeSource={RelativeSource Self}}"
        FocusManager.FocusedElement="{Binding ElementName=FieldsContainerGrid}"
        Height="165" Width="341">       
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="127*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid Name="FieldsContainerGrid" Margin="20,20,20,0" Grid.Row="0" MinWidth="100" MinHeight="50">
            <ListView ItemsSource="{Binding Items}">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <WrapPanel>
                            <Label Content="{Binding Key}" Background="Red"></Label>
                            <TextBox Text="{Binding Value}"></TextBox>
                        </WrapPanel>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </Grid>

        <StackPanel Margin="5" Grid.Row="1" HorizontalAlignment="Center" Orientation="Horizontal">
            <Button Margin="5" Width="100" Height="20" Click="OkButton_Click" IsDefault="True">
                Save
            </Button>
            <Button Margin="5" Width="100" Height="20" Click="CancelButton_Click" IsCancel="True">
                Cancel
            </Button>
        </StackPanel>
    </Grid>
</Window>

Answer 1

设计器实例化您的基类（ Window ），而不是您的代码隐藏类。

最简单的解决方案是制作一个静态虚拟模型属性，然后编写

d:DataContext="{x:Static local:DummyModel.Instance}"