MVVMLight ViewModel to View 訊息傳遞
阿新 • • 發佈:2021-07-21
XAML:
<Grid DataContext="{Binding Source={StaticResource Locator}, Path=Main}"> <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center"> <StackPanel Orientation="Horizontal" Margin="10" > <Button x:Name="do_cal" Command="{Binding SendCommand}" Content="計算" Height="30" Width="80" Margin="30"/> </StackPanel> </StackPanel> </Grid>
CodeBehind:
public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); Messenger.Default.Register<string>(this, "showMessage", s => ShowMessage(s)); Unloaded += (sender, e) => Messenger.Default.Unregister(this); // 解除安裝 註冊的訊息 } private void ShowMessage(string msg) { MessageBox.Show(msg, "訊息", MessageBoxButton.YesNo, MessageBoxImage.Information); } }
ViewModel:
private RelayCommand sendCommand; public RelayCommand SendCommand { get { if (sendCommand == null) { sendCommand = new RelayCommand(() => ExcuteSendCommand()); } return sendCommand; } set { sendCommand = value; } } private void ExcuteSendCommand() { Messenger.Default.Send<string>("來自 ViewModel 的訊息!!", "showMessage"); }
參考: https://www.cnblogs.com/wzh2010/p/6679025.html