请教一下 wpf绑定问题

[晚安苏州]

我在界面上放了一个combobox,一个textbox:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Loaded="page_loaded"
        DataContext="{Binding RelativeSource={RelativeSource Self}}"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <StackPanel x:Name="panel_1" Grid.Row="0" Height="auto">
            <ComboBox x:Name="comboBox" Grid.Row="0" ItemsSource="{Binding StudyList}"
              DisplayMemberPath="Name" SelectedValuePath="Name" SelectedItem="{Binding SelectedStudy,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Left" Margin="3" VerticalAlignment="Top" Width="120"/>
            <Button x:Name="button1" Content="动态增加textbox" HorizontalAlignment="Left" Margin="3" VerticalAlignment="Top" Width="75" Click="button_Click" />
        </StackPanel>
     
        <StackPanel x:Name="panel_2" Grid.Row="1">
            <TextBlock>下面是2个TextBox</TextBlock>
            <TextBox Text="{Binding SelectedStudy.Name}" ></TextBox>
        </StackPanel>
      
    </Grid>
</Window>

其中textbox绑定的是combobox选定项的一个属性：Name

还有一个按钮作用是：动态增加一个textbox，text值同样是绑定combobox选定项的这个属性：Name

using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;


namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window,INotifyPropertyChanged
    {
        private ObservableCollection<Study> studyList= new ObservableCollection<Study>();
        public ObservableCollection<Study> StudyList
        {
            get
            {
                return studyList;
            }

            set
            {
                studyList = value;
            }
        }

        private Study selectedStudy = new Study();

        public Study SelectedStudy
        {
            get
            {
                return selectedStudy;
            }

            set
            {
                selectedStudy = value;
                if (PropertyChanged != null)
                {
                    this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("SelectedStudy"));
                }
            }
        }

        public MainWindow()
        {
            InitializeComponent();
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void button_Click(object sender, RoutedEventArgs e)
        {
            TextBox t = new TextBox();
            t.Margin = new Thickness(3);
            t.Text = "this is my text";
            this.panel_2.Children.Add(t);
            this.panel_2.RegisterName("mytext1", t);

            t.SetBinding(TextBox.TextProperty, new Binding("Name") {
                Source= StudyList,
                Mode= BindingMode.TwoWay,
                 UpdateSourceTrigger= UpdateSourceTrigger.PropertyChanged

            });
        }

        private void page_loaded(object sender, RoutedEventArgs e)
        {
            StudyList.Add(new Study() { Selected = true, Age = 20, Name = "Tom" });
            StudyList.Add(new Study() { Selected = true, Age = 22, Name = "Jack" });
            StudyList.Add(new Study() { Selected = true, Age = 23, Name = "Jimi" });
            StudyList.Add(new Study() { Selected = true, Age = 24, Name = "Cat" });
        }
    }
}

 public class Study: INotifyPropertyChanged
    {
        private string name;
        private int age;
        private bool selected;

        public event PropertyChangedEventHandler PropertyChanged;

        public string Name
        {
            get
            {
                return name;
            }

            set
            {
                name = value;
                if (null != PropertyChanged)
                {
                    this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Name"));
                }
            }
        }

        public int Age
        {
            get
            {
                return age;
            }

            set
            {
                age = value;
                if (null != PropertyChanged)
                    this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Age"));

            }
        }

        public bool Selected
        {
            get
            {
                return selected;
            }

            set
            {
                selected = value;

                if (null != PropertyChanged)
                    this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Selected"));

            }
        }
    }

现在的问题是，第一个textbox是可以随着combobox的选择改变而改变，而动态增加的这个textbox就不行。

然后我把动态textbox的绑定写成这样：

            t.SetBinding(TextBox.TextProperty, new Binding("SelectedStudy.Name") {
                Source= this,
                Mode= BindingMode.TwoWay,
                 UpdateSourceTrigger= UpdateSourceTrigger.PropertyChanged
            });

就能达到和第一个textbox一样的绑定效果，这是为什么呢？难道下面这种写法不对么？

            t.SetBinding(TextBox.TextProperty, new Binding("Name") {
                Source= SelectedStudy,
                Mode= BindingMode.TwoWay,
                 UpdateSourceTrigger= UpdateSourceTrigger.PropertyChanged
            });

有没有大神们给我讲解一下这里面的套路？

[晚安苏州]

[exception92]

那样写的话 textbox的source 是个集合，textbox就不知道要显示集合中的那个name。 动态增加一个textbox，text值同样是绑定combobox选定项的这个属性：Name -》你是根据combobox的选择项 进行textbox的添加的， 当然要限定一下 textbox的source，以及text对应的name 为当前选择的SelectedItem

[exception92]

完全可以在 后台构造函数中 设置 this.DataContext = this. 进而在xaml中 将设置DataContext的部分删掉。