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");