Question

在我对数据库和代码进行一些更改之前，我的项目运行良好。

更改前：

输出：

Tile1    Tile7    ..........    Tile(N-x)
Tile2    Tile8                  Tile(N-x+1)
Tile3    Tile9                  ....
Tile4    Tile10                 ....
Tile5    Tile11                 ....
Tile6    Tile12                 Tile(N)

数据库中的表： 1 ------- [主键] 标题| 背景| 图片| ParentID * ------- [外键]

XAML：

<ListBox Grid.Row="1" x:Name="lst"
         ItemsSource="{Binding ChildrenMenus}" >

    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapPanel IsItemsHost="True" Orientation="Vertical" MaxHeight="{Binding ElementName=lst, Path=ActualHeight}"/>
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>

    <ListBox.Resources>
        <Style TargetType="{x:Type ListBoxItem}">
            <Setter Property="Width" Value="250" />
            <Setter Property="Height" Value="125" />
            <Setter Property="Margin" Value="2.5" />
            <Setter Property="Padding" Value="2.5" />
            <Setter Property="Background" Value="{Binding Background, Converter={StaticResource stringToBrushConverter}}" />
            <Setter Property="Foreground" Value="White" />
            <Setter Property="VerticalContentAlignment" Value="Bottom" />
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Foreground" Value="{Binding Background, Converter ={StaticResource stringToBrushConverter}}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </ListBox.Resources>

    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal" Height="125" Width="250">
                <Path Data="{Binding Image}"  VerticalAlignment="Center" 
                      Stretch="Uniform" Fill="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}}"
                      Width="68" Height="68" Margin="10" RenderTransformOrigin="0.5,0.5">
                    <Path.RenderTransform>
                        <TransformGroup>
                            <TransformGroup.Children>
                                <RotateTransform Angle="0" />
                                <ScaleTransform ScaleX="1" ScaleY="1" />
                            </TransformGroup.Children>
                        </TransformGroup>
                    </Path.RenderTransform>
                </Path>
                <TextBlock Text="{Binding Title, Converter={StaticResource spaceToNewLineConverter}}" VerticalAlignment="Top" 
                           Margin="40,10,10,10" FontSize="24" Foreground="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}}"/>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>

</ListBox>

目前：

必需输出：

Text1     Text2            Text3             ..........     Text(N)

Tile1     Tile3  Tile7     Tile9    Tile13                  Tile(N-x)        .....
Tile2     Tile4  Tile8     Tile10                           Tile(N-x + 1)    .....
          Tile5            Tile11                           ....             .....
          Tile6            Tile12                           ....             Tile(N)

数据库中的更改：

enter image description here

我在ViewModel和XAML文件中尝试了很多更改，现在它搞砸了。所以，如果我发布这些代码，那么对任何人都没有用。

我希望我已经正确地提到了一切。

更新

首先，我很抱歉。我的互联网连接一整天都没了。我刚才看到了你的消息。

现在，我有了一些东西。我可以从Design_Master_MenuItems中的数据库中获取数据。见下图：

enter image description here

但是Binding仍然无法正常工作。我的意思是ItemsControl中的ListBoxes没有被填充。

这是我目前的XAML：

<ItemsControl ItemsSource="{Binding MenuCategories}" >

    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <StackPanel IsItemsHost="True" Orientation="Horizontal" />
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>

    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Grid >
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>

                <TextBlock Text="{Binding Title}" FontSize="30" />

                <ListBox Grid.Row="1" x:Name="lst"
                         ItemsSource="{Binding Design_Master_TileItems}" DisplayMemberPath="Title">

                </ListBox>
            </Grid>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

这是myViewModel：

public class MainWindowViewModel : ViewModelBase
{

    public MainWindowViewModel()
    {
        using (Entities db = new Entities())
        {
            ParentMenus = new ObservableCollection<Design_Master_ParentMenus>(from d in db.Design_Master_ParentMenus select d);

            if (SelectedParent != null)
                MenuCategories = new ObservableCollection<Design_Master_Categories>(from d in db.Design_Master_Categories
                                                                                  where d.ParentMenuID == SelectedParent.ParentMenuID 
                                                                                  select d);
        }
    }

    private ObservableCollection<Design_Master_ParentMenus> _parentMenus;
    public ObservableCollection<Design_Master_ParentMenus> ParentMenus
    {
        get
        {
            return _parentMenus;
        }
        set
        {
            _parentMenus = value;
            OnPropertyChanged("ParentMenus");
        }
    }

    private Design_Master_ParentMenus _selectedParent;
    public Design_Master_ParentMenus SelectedParent
    {
        get
        {
            return _selectedParent;
        }
        set
        {
            _selectedParent = value;
            OnPropertyChanged("SelectedParent");

            using (Entities db = new Entities())
            {
                MenuCategories = new ObservableCollection<Design_Master_Categories>(from d in db.Design_Master_Categories
                                                                                  where d.ParentMenuID == SelectedParent.ParentMenuID
                                                                                  select d);
            }
        }
    }

    private ObservableCollection<Design_Master_Categories> _menuCategories;
    public ObservableCollection<Design_Master_Categories> MenuCategories
    {
        get
        {
            return _menuCategories;
        }
        set
        {
            _menuCategories = value;
            OnPropertyChanged("MenuCategories");
        }
    }

}

是的，我将在接下来的10个小时内无法使用。如果您在上述代码中发现任何错误，您可以发表评论。谢谢你的帮助。

UPDATE2

是的，我现在在输出窗口中找到了绑定错误：

System.Windows.Data Error: 17 : Cannot get 'Design_Master_TileItem' value (type 'ICollection`1') from '' 
(type 'Design_Master_Catego_79D2EFE4D31EC6575261E40C340C9D078D37C022F94C70A5F8A88A9017957C24').     
BindingExpression:Path=Design_Master_TileItem; 
DataItem='Design_Master_Catego_79D2EFE4D31EC6575261E40C340C9D078D37C022F94C70A5F8A88A9017957C24' 
(HashCode=28842409); target element is 'ListBox' (Name=''); target property is 'ItemsSource' (type 
'IEnumerable') TargetInvocationException:'System.Reflection.TargetInvocationException: Property accessor 
'Design_Master_TileItem' on object
'System.Data.Entity.DynamicProxies.Design_Master_Catego_79D2EFE4D31EC6575261E40C340C9D078D37C022F94C70A5F8A8
8A9017957C24' threw the following exception:'The ObjectContext instance has been disposed and can no     
longer be used for operations that require a connection.' ---> System.ObjectDisposedException: The 
ObjectContext instance has been disposed and can no longer be used for operations that require a 
connection.

System.Windows.Data Error: 17 : Cannot get 'Design_Master_TileItem' value (type 'ICollection`1') from '' 
(type 'Design_Master_Catego_79D2EFE4D31EC6575261E40C340C9D078D37C022F94C70A5F8A88A9017957C24'). 
BindingExpression:Path=Design_Master_TileItem; 
DataItem='Design_Master_Catego_79D2EFE4D31EC6575261E40C340C9D078D37C022F94C70A5F8A88A9017957C24' 
(HashCode=13006057); target element is 'ListBox' (Name=''); target property is 'ItemsSource' (type 
'IEnumerable') TargetInvocationException:'System.Reflection.TargetInvocationException: Property accessor 
'Design_Master_TileItem' on object 
'System.Data.Entity.DynamicProxies.Design_Master_Catego_79D2EFE4D31EC6575261E40C340C9D078D37C022F94C70A5F8A8    
8A9017957C24' threw the following exception:'The ObjectContext instance has been disposed and can no 
longer be used for operations that require a connection.' ---> System.ObjectDisposedException: The     
ObjectContext instance has been disposed and can no longer be used for operations that require a       
connection.

Answer 1

首先，您需要一个带有水平StackPanel的ListView作为面板模板来获取“大”块。

然后，对于每个块，您将需要一个“标题”，然后是另一个ListView，这次使用垂直WrapPanel作为面板模板。下面是一个“shell”示例，需要一些样式和绑定才能使其看起来完全符合您的需要，但希望它能让您走上正确的轨道。

<ListView>
   <ListView.ItemsPanel>
       <ItemsPanelTemplate>
           <StackPanel Orientation="Horizontal"></StackPanel>
       </ItemsPanelTemplate>
   </ListView.ItemsPanel>
   <ListView.ItemTemplate>
       <DataTemplate>
           <StackPanel>
               <TextBlock/>
               <ListView>
                   <ListView.ItemPanelTemplate>
                       <WrapPanel Orientation="Vertical"></WrapPanel>
                   </ListView.ItemPanelTemplate>
                   <ListView.ItemTemplate>
                       <DataTemplate>
                           <TextBlock/>
                       </DataTemplate>
                   </ListView.ItemTemplate>
               <ListView>
           </StackPanel>
       </DataTemplate>
   </ListView.ItemTemplate>
<ListView>

<强>更新

要只有“一个选择”，请确保选择任一列表框都会调用您的媒体资源上的设置者。我通常不会使用RelativeSource来做这个，所以这里有一个例子，如果你想尝试它（你的窗口/用户控件被命名为“Root”：

"{Binding ElemantName=Root, Path=DataContext.SelectedTileItem}"

转换器要做到这一点真的很复杂。这个answer有一种可接受的方式来设置你想要做的事情，这可能是你想要的方式（我会使用组名路由，因为这基本上是你想要做的）

哪种控制更适合下面显示的输出？

1 个答案: