2021-11-29 Wpf的ViewModel和xaml绑定

ViewModel代码

public class MainViewModel
    {
        MainWindow _mainWindow;
        public MainViewModel(MainWindow mainWindow)
        {
            _mainWindow = mainWindow;
        }
        private string _value;

        public string Value
        {
            get { return _value; }
            set { 
                _value = value;
                _mainWindow.First.Text = value;
                if (value=="200")
                {
                    _mainWindow.First.Background = Brushes.Blue;//First是textbox的名称
                    _mainWindow.First.Width = 300;
                    _mainWindow.First.Height = 200;
                }
            }
        }

    }

xaml代码

public partial class MainWindow : Window
    {
        MainViewModel mainViewModel = null;
        public MainWindow()
        {
            InitializeComponent();
            
            mainViewModel = new MainViewModel(this);
            mainViewModel.Value = "200";
        }
    }