将WPF控件绑定到与form类分开的类中的对象

public class MyViewModel : INotifyPropertyChanged
{
    private string _text;
    public string Text
    {
        get { return _text; }
        set
        {
            if (_text != value)
            {
                _text = value;
                OnPropertyChanged(nameof(Text));
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

<Window x:Class="MyWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:MyNamespace"
        Title="My Window" Height="450" Width="800">
    <Window.DataContext>
        <local:MyViewModel />
    </Window.DataContext>
    
    <Grid>
        <TextBox Text="{Binding Text}" />
    </Grid>
</Window>

public class MyViewModel : INotifyPropertyChanged
{
    // ...

    private ICommand _updateCommand;
    public ICommand UpdateCommand
    {
        get
        {
            if (_updateCommand == null)
            {
                _updateCommand = new RelayCommand(Update);
            }
            return _updateCommand;
        }
    }

    private void Update()
    {
        // 处理更新逻辑
    }
}