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

Posted 2021-03-21 lonelyxmas

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");