using GalaSoft.MvvmLight; using GalaSoft.MvvmLight.Command; using GalaSoft.MvvmLight.Messaging; namespace WPF_15_MvvmLightMessage.ViewModels; public class MainVIewModel : ViewModelBase { public MainVIewModel() { SendMessageCommand = new RelayCommand(SendMessage); } public RelayCommand SendMessageCommand { get; set; } private void SendMessage(string message) { // MessageBox.Show("Hello World"); Console.WriteLine("发送消息。。。"); Messenger.Default.Send(message, "Token1"); } }