WPF关于绑定与更新修改

看到一些资料与教程视频，

首先我们先做好一个公共的INotifyPropertyChanged事件，也就是通知更新，当然如果你安装了MvvmLight包，可以直接直接不用写

 public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;
        public void OnPropertyChanged([CallerMemberName]string propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

再创建命令类

public class MyCommand : ICommand
    {
 
        Action executeAction;
        public MyCommand(Action action)
        {
            executeAction = action;
        }
        public event EventHandler? CanExecuteChanged;
 
        public bool CanExecute(object? parameter)
        {
            return true;
        }
 
        public void Execute(object? parameter)
        {
            executeAction();
        }
    }

然后创建我们要ViewModel类，要引用到前面写好的通知更新类, 把方法放在set中，也就是OnPropertyChanged()方法，MvvmLight包是RaisePropertyChanged()方法

public class MainViewMoel:ViewModelBase
    {
        public MainViewMoel()
        {
            Name = "GGG";
            ShowCommand = new MyCommand(Show);
        }
 
        public MyCommand ShowCommand { get; set; }
        private string name ="";
        public string Name { get { return name; } 
            set 
            { 
                name = value;OnPropertyChanged(); 
            } 
        }
        public void Show()
        {
            Name = "1111111111";
            MessageBox.Show("这是个按钮！");
        }
    }

最后赋值到我们的对应的页面上

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewMoel();
        }
    }

xaml 中也要绑定对应的控件中

 <StackPanel >
            <TextBox Height="50" Text="{Binding Name}" x:Name="txtName" Margin="5"/>
            <Button Height="50" Command="{Binding ShowCommand}"  x:Name="Btn" Margin="5"/>
        </StackPanel>