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

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");