如何将TabControl绑定到ViewModels的集合?

问题描述

基本上，我的MainViewModel.cs中有:

Basically I have in my MainViewModel.cs:

ObservableCollection<TabItem> MyTabs { get; private set; }

但是，我需要以某种方式不仅能够创建选项卡，还能够在维护MVVM的同时将选项卡的内容加载并链接到其相应的视图模型.

However, I need to somehow be able to not only create the tabs, but have the tabs content be loaded and linked to their appropriate viewmodels while maintaining MVVM.

基本上，我如何才能将用户控件作为Tabitem的内容加载，并使该用户控件连接到适当的视图模型.造成这一困难的部分是ViewModel不应构造实际的视图项，对吗?还是可以?

Basically, how can I get a usercontrol to be loaded as the content of a tabitem AND have that usercontrol wired up to an appropriate viewmodel. The part that makes this difficult is the ViewModel is not supposed to construct the actual view items, right? Or can it?

基本上，这是否适合MVVM:

Basically, would this be MVVM appropriate:

UserControl address = new AddressControl();
NotificationObject vm = new AddressViewModel();
address.DataContext = vm;
MyTabs[0] = new TabItem()
{
    Content = address;
}

我只问是因为，好吧，我是在ViewModel中构造一个View(AddressControl)，对我来说这听起来像是MVVM否.

I only ask because well, i'm constructing a View (AddressControl) from within a ViewModel, which to me sounds like a MVVM no-no.

推荐答案

这不是MVVM.您不应在视图模型中创建UI元素.

This isn't MVVM. You should not be creating UI elements in your view model.

您应该将Tab的ItemsSource绑定到ObservableCollection，并且应该包含带有应创建的Tab信息的模型.

You should be binding the ItemsSource of the Tab to your ObservableCollection, and that should hold models with information about the tabs that should be created.

以下是代表选项卡页面的VM和模型:

Here are the VM and the model which represents a tab page:

public sealed class ViewModel
{
    public ObservableCollection<TabItem> Tabs {get;set;}
    public ViewModel()
    {
        Tabs = new ObservableCollection<TabItem>();
        Tabs.Add(new TabItem { Header = "One", Content = "One's content" });
        Tabs.Add(new TabItem { Header = "Two", Content = "Two's content" });
    }
}
public sealed class TabItem
{
    public string Header { get; set; }
    public string Content { get; set; }
}

这是绑定在窗口中的外观:

And here is how the bindings look in the window:

<Window x:Class="WpfApplication12.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.DataContext>
        <ViewModel
            xmlns="clr-namespace:WpfApplication12" />
    </Window.DataContext>
    <TabControl
        ItemsSource="{Binding Tabs}">
        <TabControl.ItemTemplate>
            <!-- this is the header template-->
            <DataTemplate>
                <TextBlock
                    Text="{Binding Header}" />
            </DataTemplate>
        </TabControl.ItemTemplate>
        <TabControl.ContentTemplate>
            <!-- this is the body of the TabItem template-->
            <DataTemplate>
                <TextBlock
                    Text="{Binding Content}" />
            </DataTemplate>
        </TabControl.ContentTemplate>
    </TabControl>
</Window>

数据模板内的UserControl:

A UserControl inside the data template:

<TabControl
    ItemsSource="{Binding Tabs}">
    <TabControl.ItemTemplate>
        <!-- this is the header template-->
        <DataTemplate>
            <TextBlock
                Text="{Binding Header}" />
        </DataTemplate>
    </TabControl.ItemTemplate>
    <TabControl.ContentTemplate>
        <!-- this is the body of the TabItem template-->
        <DataTemplate>
            <MyUserControl xmlns="clr-namespace:WpfApplication12" />
        </DataTemplate>
    </TabControl.ContentTemplate>
</TabControl>

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