WPF组合框在表项上的选择改变

您的问题已经重现。但是我找不到任何问题。请看看下面的代码，你可能会得到解决方案。这是我的解决方案。

MyTab视图模型

public class MyTab : ViewModelBase
{
    #region Declarations
    private ObservableCollection<string> statusList;
    private string selectedStatus;
    #endregion
    #region Properties
    /// <summary>
    /// Gets or sets the header.
    /// </summary>
    /// <value>The header.</value>
    public string Header { get; set; }
    /// <summary>
    /// Gets or sets the content.
    /// </summary>
    /// <value>The content.</value>
    public string Content { get; set; }
    /// <summary>
    /// Gets or sets the status list.
    /// </summary>
    /// <value>The status list.</value>
    public ObservableCollection<string> StatusList
    {
        get
        {
            return statusList;
        }
        set
        {
            statusList = value;
            NotifyPropertyChanged("StatusList");
        }
    }
    /// <summary>
    /// Gets or sets the selected status.
    /// </summary>
    /// <value>The selected status.</value>
    public string SelectedStatus
    {
        get
        {
            return selectedStatus;
        }
        set
        {
            selectedStatus = value;
            NotifyPropertyChanged("SelectedStatus");
        }
    }
    #endregion
}

MainViewModel视图模型

public class MainViewModel : ViewModelBase
{
    #region Declarations
    private ObservableCollection<MyTab> tabs;
    private MyTab selectedTab;
    #endregion
    #region Properties
    /// <summary>
    /// Gets or sets the tabs.
    /// </summary>
    /// <value>The tabs.</value>
    public ObservableCollection<MyTab> Tabs
    {
        get
        {
            return tabs;
        }
        set
        {
            tabs = value;
            NotifyPropertyChanged("Tabs");
        }
    }
    /// <summary>
    /// Gets or sets the selected tab.
    /// </summary>
    /// <value>The selected tab.</value>
    public MyTab SelectedTab
    {
        get
        {
            return selectedTab;
        }
        set
        {
            selectedTab = value;
            NotifyPropertyChanged("SelectedTab");
        }
    }
    #endregion
    #region Constructors
    /// <summary>
    /// Initializes a new instance of the <see cref="MainViewModel"/> class.
    /// </summary>
    public MainViewModel()
    {
        this.Tabs = new ObservableCollection<MyTab>();
        MyTab tab1 = new MyTab();
        tab1.Header = "tab1";
        tab1.Content = "Tab 1 content";
        ObservableCollection<string> tab1StatusList = new ObservableCollection<string>();
        tab1StatusList.Add("tab1 item1");
        tab1StatusList.Add("tab1 item2");
        tab1StatusList.Add("tab1 item3");
        tab1.StatusList = tab1StatusList;
        tab1.SelectedStatus = tab1StatusList.First();
        this.Tabs.Add(tab1);
        MyTab tab2 = new MyTab();
        tab2.Header = "tab2";
        tab2.Content = "Tab 2 content";
        ObservableCollection<string> tab2StatusList = new ObservableCollection<string>();
        tab2StatusList.Add("tab2 item1");
        tab2StatusList.Add("tab2 item2");
        tab2StatusList.Add("tab2 item3");
        tab2.StatusList = tab2StatusList;
        tab2.SelectedStatus = tab2StatusList.First();
        this.Tabs.Add(tab2);
        this.SelectedTab = tab1;
    }
    #endregion
}

最后是XAML

 <Window x:Class="ComboboxSelectedItem.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:viewModel="clr-namespace:ComboboxSelectedItem.ViewModels"
    Title="MainWindow" Height="350" Width="525">
<Grid Name="mainGrid">
    <Grid.DataContext>
        <viewModel:MainViewModel />
    </Grid.DataContext>
    <TabControl
        ItemsSource="{Binding Tabs, Mode=TwoWay}"
        SelectedItem="{Binding SelectedTab}">
        <TabControl.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Header}" Margin="0 0 20 0"/>
                </StackPanel>
            </DataTemplate>
        </TabControl.ItemTemplate>
        <!--Content section-->
        <TabControl.ContentTemplate>
            <DataTemplate>
                <Grid>
                    <StackPanel Orientation="Vertical">
                        <TextBlock
                            Text="{Binding Content}" />
                        <ComboBox
                            ItemsSource="{Binding StatusList}"
                            SelectedItem="{Binding SelectedStatus}" />
                    </StackPanel>
                </Grid>
            </DataTemplate>
        </TabControl.ContentTemplate>
    </TabControl>
</Grid>
</Window>

您绝对确定正在创建视图模型的新实例吗?如果不是，那么组合框将共享相同的collectionviewsource，这意味着一个组合框中的更改将反映在所有组合框中。我自己也有同样的问题。

尝试在代码中声明集合视图源代码:

CollectionViewSource StatusListViewSource = new CollectionViewSource();
StatusListViewSource.Source = SPL2StatusCollection;

然后在xaml中更改绑定到collectionviewsource:

ItemsSource="{Binding StatusListViewSource.View}"

我是从vb转换过来的，所以它可能需要一些编辑。这有帮助吗?