1. ItemsSource="{Binding GroupList}" SelectedItem="{Binding SelectedGroupItem,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"

ItemsSource:绑定的数据列表

SelectedItem：当前选中项

2.<TabControl.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock></TextBlock>
                        <TextBlock Text="{Binding GroupName}" Tag="{Binding GroupName}" MaxWidth="80" TextTrimming="WordEllipsis"></TextBlock>
                    </StackPanel>
                </DataTemplate>
    </TabControl.ItemTemplate>

这里的意思是在TabControl的标签上，做了一个TextBlock，数据绑定的是GroupName，班级名，级“一班”，“二班”，“三班”

3.TabControl中使用了ListBox，注意事项

using GalaSoft.MvvmLight;

using GalaSoft.MvvmLight.CommandWpf;

using System.Text.RegularExpressions;

using System.Windows.Input;

using System.Net;

using System.IO;

using System.Text;

using System.Security.Cryptography.X509Certificates;

using System.Net.Security;

using System.Collections.Generic;

using Newtonsoft.Json;

using System;

using System.Runtime.InteropServices;

using System.Xml;

using MVVM.Model;

using System.Xml.Linq;

using System.Windows;

using MVVM.communication;

using System.Threading;

using Microsoft.Win32;

using MVVM.Service;

using MVVM.ftp;

using System.Linq;

using System.Collections.ObjectModel;

namespace MVVM.ViewModel

{

    /// <summary>

    /// This class contains properties that the main View can data bind to.

    /// <para>

    /// Use the <strong>mvvminpc</strong> snippet to add bindable properties to this ViewModel.

    /// </para>

    /// <para>

    /// You can also use Blend to data bind with the tool's support.

    /// </para>

    /// <para>

    /// See http://www.galasoft.ch/mvvm

    /// </para>

    /// </summary>

    public class MainViewModel : ViewModelBase

    {

        /// <summary>

        /// TabControl 绑定的数据列表

        /// </summary>

        public ObservableCollection<StudentGroup> GroupList//ObservableCollection

        {

            get { return _groupList; }

            set { Set(() => GroupList, ref _groupList, value); }

        }

        private ObservableCollection<StudentGroup> _groupList = new ObservableCollection<StudentGroup>();

        /// <summary>

        /// 当前选中的TabControl

        /// </summary>

        public StudentGroup SelectedGroupItem

        {

            get { return _selectedGroupItem; }

            set { Set(() => SelectedGroupItem, ref _selectedGroupItem, value); }

        }

        private StudentGroup _selectedGroupItem;

        public MainViewModel()

        {

            //TabControl 绑定的数据列表 初始化

            ObservableCollection<Student> g1StuList = new ObservableCollection<Student>();

            Student s1 = new Student(,"zhangsan","","bj");

            g1StuList.Add(s1);

            StudentGroup g1 = new StudentGroup(,"一班","学习好",g1StuList);

            ObservableCollection<Student> g2StuList = new ObservableCollection<Student>();

            Student s2 = new Student(, "lisi", "", "bj");

            Student s3 = new Student(, "wanger", "", "bj");

            Student s4 = new Student(, "maqi", "", "bj");

            Student s5 = new Student(, "gouba", "", "bj");

            g2StuList.Add(s2);

            g2StuList.Add(s3);

            g2StuList.Add(s4);

            g2StuList.Add(s5);

            StudentGroup g2 = new StudentGroup(, "二班", "爱玩", g2StuList);

            ObservableCollection<Student> g3StuList = new ObservableCollection<Student>();

            Student s6 = new Student(, "zhangsan", "", "shanghai");

            Student s7 = new Student(, "zhangsan", "", "nanjing");

            g3StuList.Add(s6);

            g3StuList.Add(s7);

            StudentGroup g3 = new StudentGroup(, "三班", "体育好", g3StuList);

            GroupList.Add(g1);

            GroupList.Add(g2);

            GroupList.Add(g3);

            //当前选中的TabControl 赋初值

            SelectedGroupItem = GroupList[];

        }

    }

}
<Window x:Class="MVVM.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

        xmlns:command="http://www.galasoft.ch/mvvmlight"

        Title="MainWindow" Height="600" Width="700">

    <Window.DataContext>

        <Binding Path="Main" Source="{StaticResource Locator}"></Binding>

    </Window.DataContext>

    <Grid>

        <Grid.Resources>

            <Style x:Key="BackColor" TargetType="Rectangle">

                <Setter Property="Fill" Value="Black"></Setter>

            </Style>

        </Grid.Resources>

        <Grid.RowDefinitions>

            <RowDefinition Height="3*"/>

            <RowDefinition Height="*"/>

        </Grid.RowDefinitions>

        <TabControl ItemsSource="{Binding GroupList}" SelectedItem="{Binding SelectedGroupItem,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Margin="0,10,0,54" Grid.RowSpan="4">

            <!--<TabControl.Resources>

                <Style></Style>

            </TabControl.Resources>-->

            <TabControl.ItemTemplate>

                <DataTemplate>

                    <StackPanel>

                        <TextBlock></TextBlock>

                        <TextBlock Text="{Binding GroupName}" Tag="{Binding GroupName}" MaxWidth="80" TextTrimming="WordEllipsis"></TextBlock>

                    </StackPanel>

                </DataTemplate>

            </TabControl.ItemTemplate>

            <TabControl.ContentTemplate>

                <DataTemplate>

                    <!--<DataTemplate.Resources>

                        <Style></Style>

                    </DataTemplate.Resources>-->

                    <Grid>

                        <Grid.RowDefinitions>

                            <RowDefinition/>

                            <RowDefinition/>

                            <RowDefinition Height="200"/>

                        </Grid.RowDefinitions>

                        <StackPanel>

                            <StackPanel>

                                <TextBlock Text="班级ID" Grid.Column="0" Grid.Row="0"></TextBlock>

                                <TextBlock Text="{Binding GroupID}" Grid.Column="1" Grid.Row="0"></TextBlock>

                            </StackPanel>

                            <StackPanel>

                                <TextBlock Text="班级名称" Grid.Column="0" Grid.Row="1"></TextBlock>

                                <TextBlock Text="{Binding GroupName}" Grid.Column="1" Grid.Row="1"></TextBlock>

                            </StackPanel>

                            <StackPanel>

                                <TextBlock Text="班级描述" Grid.Column="0" Grid.Row="2"></TextBlock>

                                <TextBlock Text="{Binding GroupDesc}" Grid.Column="1" Grid.Row="2"></TextBlock>

                            </StackPanel>

                        </StackPanel>

                        <!-- 横线-->

                        <Rectangle Grid.Row="1" Margin="5,0,30,5" Height="2" VerticalAlignment="Center" HorizontalAlignment="Stretch"></Rectangle>

                        <ScrollViewer Grid.Row="2" CanContentScroll="False" Focusable="False" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">

                            <ListBox ItemsSource="{Binding StuList}">

                                <!--<ListBox.Resources>

                                    <Style></Style>

                                </ListBox.Resources>-->

                                <ListBox.ItemTemplate>

                                    <DataTemplate>

                                        <Expander IsExpanded="True">

                                            <Expander.HeaderTemplate>

                                                <DataTemplate>

                                                    <StackPanel>

                                                        <TextBlock Text="{Binding Name}"></TextBlock>

                                                    </StackPanel>

                                                </DataTemplate>

                                            </Expander.HeaderTemplate>

                                            <Grid>

                                                <Grid.RowDefinitions>

                                                    <RowDefinition />

                                                    <RowDefinition />

                                                    <RowDefinition />

                                                </Grid.RowDefinitions>

                                                <Grid.ColumnDefinitions>

                                                    <ColumnDefinition />

                                                    <ColumnDefinition />

                                                </Grid.ColumnDefinitions>

                                                <StackPanel Grid.Row="0" Grid.Column="0">

                                                    <TextBlock Text="ID:"></TextBlock>

                                                </StackPanel>

                                                <StackPanel Grid.Row="0" Grid.Column="1">

                                                    <TextBlock Text="{Binding ID}"></TextBlock>

                                                </StackPanel>

                                                <StackPanel Grid.Row="1" Grid.Column="0">

                                                    <TextBlock Text="电话:"></TextBlock>

                                                </StackPanel>

                                                <StackPanel Grid.Row="1" Grid.Column="1">

                                                    <TextBlock Text="{Binding Telephone}"></TextBlock>

                                                </StackPanel>

                                                <StackPanel Grid.Row="2" Grid.Column="0">

                                                    <TextBlock Text="地址:"></TextBlock>

                                                </StackPanel>

                                                <StackPanel Grid.Row="2" Grid.Column="1">

                                                    <TextBlock Text="{Binding Address}"></TextBlock>

                                                </StackPanel>

                                            </Grid>

                                        </Expander>

                                    </DataTemplate>

                                </ListBox.ItemTemplate>

                            </ListBox>

                        </ScrollViewer>

                    </Grid>

                </DataTemplate>

            </TabControl.ContentTemplate>

        </TabControl>

        <StackPanel Grid.Row="1">

            <!--<Button Content="点击我" Command="{Binding ClickCommand}"></Button>-->

        </StackPanel>

    </Grid>

</Window>
using GalaSoft.MvvmLight;

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace MVVM.Model

{

    public class StudentGroup : ObservableObject

    {

        public int GroupID

        {

            get { return _groupID; }

            set { Set(() => GroupID, ref _groupID, value); }

        }

        private int _groupID;

        public String GroupName

        {

            get { return _groupName; }

            set { Set(() => GroupName, ref _groupName, value); }

        }

        private String _groupName;

        public String GroupDesc

        {

            get { return _groupDesc; }

            set { Set(() => GroupDesc, ref _groupDesc, value); }

        }

        private String _groupDesc;

        public ObservableCollection<Student> StuList

        {

            get { return _stuList; }

            set { Set(() => StuList, ref _stuList, value); }

        }

        private ObservableCollection<Student> _stuList = new ObservableCollection<Student>();

        public StudentGroup(int id, String groupName, String groupDesc,  ObservableCollection<Student> stuList)

        {

            this.GroupID = id;

            this.GroupName = groupName;

            this.GroupDesc = groupDesc;

            this.StuList = stuList;

        }

        public StudentGroup ()

        {

        }

    }

}
using GalaSoft.MvvmLight;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace MVVM.Model

{

    public class Student : ObservableObject

    {

        public int ID

        {

            get { return _id; }

            set { Set(() => ID, ref _id, value); }

        }

        private int _id;

        public String Name

        {

            get { return _name; }

            set { Set(() => Name, ref _name, value); }

        }

        private String _name;

        public String Telephone

        {

            get { return _telephone; }

            set { Set(() => Telephone, ref _telephone, value); }

        }

        private String _telephone;

        public String Address

        {

            get { return _address; }

            set { Set(() => Address, ref _address, value); }

        }

        private String _address;

        public Student(int id, String name, String tele, String address)

        {

            this.ID = id;

            this.Name = name;

            this.Telephone = tele;

            this.Address = address;

        }

    }

}

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