原文:WPF 高级篇 MVVM (MVVMlight) 依赖注入使用Messagebox

MVVMlight 实现依赖注入 把弹框功能 和接口功能注入到各个插件中

使用依赖注入 先把所有的ViewModel都注册到到容器中 MVVMlight SimpleIoc 来实现注册

        public ViewModelLocator()







        {







            SimpleIoc.Default.Register<MainViewModel>();







            SimpleIoc.Default.Register<EditBookViewModel>();







            SimpleIoc.Default.Register<IDialogService, DialogService>();







        }























        private MainViewModel mainViewModel ;















        public MainViewModel MainViewModel







        {







            get { return mainViewModel = SimpleIoc.Default.GetInstance<MainViewModel>(Guid.NewGuid().ToString()); }







            set { mainViewModel = value; }















        }















        private EditBookViewModel editBookViewModel ;















        public EditBookViewModel EditBookViewModel







        {







            get { return editBookViewModel = SimpleIoc.Default.GetInstance<EditBookViewModel>(Guid.NewGuid().ToString()); }







            set { editBookViewModel = value; }







        }

Message 接口

   public interface IDialogService







    {







       void ShowMessage(string message, string title = "提示");







       bool Confirm(string message, string title = "询问");







    }

实现类

  public class DialogService:IDialogService







    {







        public void ShowMessage(string message, string title = "提示")







        {







            MessageBox.Show(message, title, MessageBoxButton.OK, MessageBoxImage.Information);







        }















        public bool Confirm(string message, string title = "询问")







        {







            var result = MessageBox.Show(message, title, MessageBoxButton.OKCancel, MessageBoxImage.Question);







            if (result == MessageBoxResult.OK)







            {







                return true;







            }







            else 







            {







                return false;







            }







        }







    }

在每一个View Model 的构造函数里  定义接口对象

     public EditBookViewModel(IDialogService dialogService)







        {















            DialogService = dialogService;







        }







       private IDialogService dialogService;















        public IDialogService DialogService







        {







            get { return dialogService; }







            set { dialogService = value; }







        }

并使用方法

  DialogService.ShowMessage(EditBookArgs.IsEdit ? "编辑成功" : "新增成功");