可以将TextBox控件(其他控件也基本一样)与某个变量进行绑定，做出改变变量则控件也跟着改变的效果。
首先需要声明一个类，该类用来与控件绑定：
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace TestWPF
{
public class Person : INotifyPropertyChanged
{
private string _Name;
public string Name
{
get => _Name; //等同于return _Name;
set
{
_Name = value;
//执行通知属性已经发生改变
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Name"));
}
}
#region resharper补全代码
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName]string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
protected bool SetField<T>(ref T field, T value, [CallerMemberName]string propertyName = null)
{
if (EqualityComparer<T>.Default.Equals(field, value))
{
return false;
}
field = value;
OnPropertyChanged(propertyName);
return true;
}
#endregion
}
}然后在XAML文件中绑定：
<TextBox Name="textBox1" Width="400" Height="200" Text="{Binding Name}" />//Name为要绑定的变量其中，继承的INotifyPropertyChanged类是用来发送消息告诉控件变量的值改变了，控件需要作出调整。
接着实例化相应的对象，并跟控件绑定：
public partial class MainWindow : Window
{
public Person person = new Person();
public MainWindow()
{
//初始化
InitializeComponent();
person.Name = "1313";//初始赋值
textBox1.DataContext = person;
}
private void button1_Click(object sender, RoutedEventArgs e)
{
person.Name = textbox2.Text;
}
} 
点击按钮修改变量Name的值后，textBox的文本随之改变:
