我有与XAML相关的问题，我试图徒劳地研究答案。我已经向XAML评论了相关问题。在我看来，由于我尝试安排事情的方式，这个问题更加复杂。
基本上我有一个在TabControl标题中使用的主视图模型，然后在内容区域中我将显示主视图模型中的项目列表。我只是不知道如何绑定。这是主要问题。但是，我怀疑我的下一步和最终目标可能会考虑如何考虑这个问题，所以我也添加了它们。其余的代码是为了完整。
<StackPanel>
<TabControl x:Name="mainsTabControl"
IsSynchronizedWithCurrentItem="True"
IsEnabled="True"
Visibility="Visible"
ItemsSource="{Binding Path=Mains}">
<!-- How to select a different background for the selected header? Note that the background color is "selected tab" if MainContentViewModel.IsActive is not TRUE.
If it is, a different color is chosen. Here this fact is just emulated with IsEnabled property due to well, multi-binding to the rescue (and a converter)? -->
<!-- Is there a clean way to use ICommand binding (RelayCommand) to check if it is OK to change the tab and if necessary, present a dialogue asking for the change? -->
<TabControl.ItemContainerStyle>
<Style TargetType="{x:Type TabItem}">
<Setter Property="IsEnabled" Value="{Binding IsActive}"/>
</Style>
</TabControl.ItemContainerStyle>
<!-- This binds to every item in the MainViewModel.Mains collection. Note the question about background color. -->
<TabControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Name}" HorizontalAlignment="Center"/>
</StackPanel>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<!-- This binding gives reference to the selected MainContentViewModel. -->
<StackPanel Orientation="Horizontal" VerticalAlignment="Top" Margin="10" DataContext="{Binding ElementName=mainsTabControl, Path=SelectedItem, Mode=OneWay}">
<ItemsControl ItemsSource="{Binding Path=CustomItems}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
</StackPanel>
using GalaSoft.MvvmLight;
using System.Collections.ObjectModel;
using System.Linq;
namespace WpfDependencyInjection.ViewModel
{
public class MainContentViewModel: ViewModelBase
{
private ObservableCollection<CustomItemViewModel> customItems;
private mainContentDto MainContent { get; set; }
public string Name { get; }
public bool isActive;
public MainContentViewModel(Engine engine, mainContentDto mainContent)
{
MainContent = mainContent;
Name = MainContent.Name;
IsActive = true;
//The custom items belonging to this main content.
var customItems = engine.CustomItemContents.Where(i => i.MainContentId == MainContent.Id).Select(i => new CustomItemViewModel(engine, i));
CustomItems = new ObservableCollection<CustomItemViewModel>(customItems);
}
public ObservableCollection<CustomItemViewModel> CustomItems
{
get
{
return customItems;
}
set
{
customItems = value;
RaisePropertyChanged(nameof(CustomItems));
}
}
public bool IsActive
{
get
{
return isActive;
}
private set
{
isActive = value;
RaisePropertyChanged(nameof(IsActive));
}
}
}
}
public class CustomItemViewModel: ViewModelBase
{
private Engine Engine { get; }
private ItemTypeDto CustomItem { get; set; }
public string Name { get; }
public CustomItemViewModel(Engine engine, ItemTypeDto customItem)
{
Engine = engine;
CustomItem = customItem;
Name = customItem.Name;
}
}
namespace WpfDependencyInjection
{
public class Engine
{
public string Name { get; } = "EngineMan";
public List<mainContentDto> MainContents { get; set; } = new List<mainContentDto>(new[]
{
new mainContentDto { Name = "Main One", Id = Guid.Parse("C51AC758-504B-4914-92DC-5EBE9A1F39E1"), Version = 1 },
new mainContentDto { Name = "Main Two", Id = Guid.Parse("C51AC758-504B-4914-92DC-5EBE9A1F39E2"), Version = 1 }
});
public List<ItemTypeDto> CustomItemContents { get; set; } = new List<ItemTypeDto>(new ItemTypeDto[]
{
new ItemType1Dto { MainContentId = Guid.Parse("C51AC758-504B-4914-92DC-5EBE9A1F39E1"), Name = "ItemType1Dto I", Id = Guid.NewGuid(), Version = 1 },
new ItemType2Dto { MainContentId = Guid.Parse("C51AC758-504B-4914-92DC-5EBE9A1F39E1"), Name = "ItemType2Dto I", Id = Guid.NewGuid(), Version = 1 },
new ItemType2Dto { MainContentId = Guid.Parse("C51AC758-504B-4914-92DC-5EBE9A1F39E2"), Name = "ItemType2Dto 2", Id = Guid.NewGuid(), Version = 1 }
});
public Engine()
{
}
}
}
＆lt;编辑：绑定部分解决，但不是ICommand部分。
答案 0 :(得分：1)
试试这个：
<TabControl x:Name="mainsTabControl"
IsEnabled="True"
IsSynchronizedWithCurrentItem="True"
ItemsSource="{Binding Path=Mains}"
SelectedItem="0"
Visibility="Visible">
<TabControl.ItemContainerStyle>
<Style TargetType="{x:Type TabItem}">
<Setter Property="IsSelected" Value="{Binding IsSelected}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<Border Background="{TemplateBinding Background}">
<ContentPresenter ContentSource="Header" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="HotPink" />
</Trigger>
</Style.Triggers>
</Style>
</TabControl.ItemContainerStyle>
<TabControl.ItemTemplate>
<DataTemplate DataType="{x:Type local:MainContentViewModel}">
<Button Background="{x:Null}"
Command="{Binding SomeCommand}"
Content="{Binding Name}"
FocusVisualStyle="{x:Null}" />
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate DataType="{x:Type local:MainContentViewModel}">
<ItemsControl Margin="10"
VerticalAlignment="Top"
ItemsSource="{Binding Path=CustomItems}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type local:CustomItem}">
<TextBlock Text="{Binding Name}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
<强>命令：
可能有更简洁的方法，但在这里我们将IsSelected TabItem绑定到viewmodel的IsSelected属性。这使得有一个命令可以询问是否可以导航并将IsSelected设置为true（如果是）。
<强>背景
我们还重新设置了tabitem，以便背景按照我们的意愿工作。如果使用Snoop WPF进行检查，则在选择项目时会插入额外的边框。
旁注1：
不要将TabControl置于StackPanel之内。一个StackPanel大小的内容，将杀死滚动并在控件外绘制。它还附带一个成本，一个深的视觉树并不便宜。 ItemTemplate和其他地方相同。实际上StackPanel很少适合任何事情:)
旁注2：
如果在DataType中指定DataTemplate，则会获得智能感知和一些编译时检查。