WPF具有多个视图以及Prism和Unity

2 回答

• 1

  使用Prism Navigation非常容易，并且它不需要您在ViewModel上创建依赖项，或者使用动态DataTemplates引入性能滞后 . 我建议阅读Prism导航文档 .

  https://github.com/PrismLibrary/Prism/blob/master/Documentation/WPF/60-Navigation.md#view-based-navigation

  基本上你使用ReqestNavigate，GoBack和GoForward的组合 .

  您还可以在此学习样本：

  https://github.com/PrismLibrary/Prism-Samples-Wpf/tree/master/View-Switching%20Navigation_Desktop

  您还应该观看这个课程，它将引导您完全了解您的要求：

  https://app.pluralsight.com/library/courses/prism-introduction/table-of-contents

  回复于 2024-04-29T12:36:26+08:00
• 0

  我有一个我很久以前写过的例子，并且它不需要任何框架废话，根据我的经验，WPF MVVM框架在大多数情况下是无用的，并且往往使简单的事情复杂化，你需要的是 ICommand 实现和 ViewModelBase 实现 INotiftyPropertyChanged ，这是一个简单的插图：

  XML：

  <Window.Resources>
          <DataTemplate DataType="{x:Type local:ViewModel1}">
              <local:View1/>
          </DataTemplate>
          <DataTemplate DataType="{x:Type local:ViewModel2}">
              <local:View2/>
          </DataTemplate>
          <DataTemplate DataType="{x:Type local:ViewModel3}">
              <local:View3/>
          </DataTemplate>
      </Window.Resources>
      <Grid>
          <Grid.RowDefinitions>
              <RowDefinition Height="*"></RowDefinition>
              <RowDefinition></RowDefinition>
          </Grid.RowDefinitions>
          <ContentControl Content="{Binding CurrentViewModel}">
          </ContentControl>
  
          <StackPanel Orientation="Horizontal" Grid.Row="1" VerticalAlignment="Bottom">
              <Button Command="{Binding PrevViewModel}">Previouws View</Button>
              <Button Command="{Binding NextViewModel}">Next View</Button>
              <Button Command="{Binding SwitchToViewModel}" CommandParameter="{x:Type local:ViewModel1}">Switch To View1</Button>
              <Button Command="{Binding SwitchToViewModel}" CommandParameter="{x:Type local:ViewModel2}">Switch To View2</Button>
              <Button Command="{Binding SwitchToViewModel}" CommandParameter="{x:Type local:ViewModel3}">Switch To View3</Button>
          </StackPanel>
      </Grid>
  

  鉴于上述情况， CurrentViewModel 属性发生变化时，将根据 DataTemplate 资源选择View，并将Window的DataContext设置为 MainViewModel .

  主ViewModel如下所示：

  public class MainViewModel : ViewModelBase
      {
          //add instances to all the ViewModels you want to switch between here, and add templates for them in your resources specifying the x:type and the view or data template to be used
          public ObservableCollection<ViewModelBase> ViewModels { get; set; } = new ObservableCollection<ViewModelBase>();
  
          private ViewModelBase _currentViewModel;
  
          public ViewModelBase CurrentViewModel {
              get { return _currentViewModel; }
              set { SetField(ref _currentViewModel, value); }
          }
  
          private ICommand _nextViewModel;
          public ICommand NextViewModel
          {
              get
              {
                  return _nextViewModel = _nextViewModel ?? new RelayCommand(p =>
                    {
                        CurrentViewModel = ViewModels[ViewModels.IndexOf(CurrentViewModel) +1];
                    }, p =>
                    {
                        return ViewModels.IndexOf(CurrentViewModel) + 1 != ViewModels.Count && CurrentViewModel != null;
                    });
              }
          }
  
          public ICommand _prevViewModel;
          public ICommand PrevViewModel
          {
              get
              {
                  return _prevViewModel = _prevViewModel ?? new RelayCommand(p =>
                  {
                      CurrentViewModel = ViewModels[ViewModels.IndexOf(CurrentViewModel) - 1];
                  }, p =>
                  {
                      return ViewModels.IndexOf(CurrentViewModel) != 0 && CurrentViewModel!=null;
                  });
              }
          }
  
          private ICommand _switchToViewModel;
          public ICommand SwitchToViewModel
          {
              get
              {
                 return _switchToViewModel = _switchToViewModel ?? new RelayCommand(p =>
                  {
                      CurrentViewModel = this.ViewModels.FirstOrDefault(vm=>vm.GetType()==p as Type);
                  }, p =>
                  {
                      return this.ViewModels.FirstOrDefault(vm => vm.GetType() != p as Type) != null;
                  });
              }
          }
      }
  

  结果看起来像

  

  回复于 2024-04-29T12:36:26+08:00