我是 MvvmCross 的新手,但我使用 mvvm 有一段时间了.我知道如何用嵌套的用户控件组合用户控件.现在使用 mvvmcross 我不得不在另一个用户控件中显示两个或多个用户控件.除了 MvvmCross,我不使用任何其他框架.我的 Rootview 看起来像这样:
`<DockPanel><TextBlock Text="Root";DockPanel.Dock=顶部"/><ContentControl x:Name=MainMenuVM"内容={Binding MainMenuVM}"DockPanel.Dock=顶部"/></DockPanel></views:MvxWpfView>`对应的ViewModel如下所示:
使用 MvvmCross.Commands;使用 MvvmCross.Logging;使用 MvvmCross.Navigation;使用 MvvmCross.ViewModels;命名空间 MvvmCrossTest.Core.ViewModels{公共类 RootViewModel:MvxNavigationViewModel{私有只读 IMvxViewModelLoader _mvxViewModelLoader;公共 RootViewModel(IMvxLogProvider logProvider, IMvxNavigationService navigationService, IMvxViewModelLoader mvxViewModelLoader) : base(logProvider, navigationService){_mvxViewModelLoader = mvxViewModelLoader;ShowMainMenu();}私有 MainMenuViewModel _mainMenuVM;public MainMenuViewModel MainMenuVM{得到 { 返回 _mainMenuVM;}放{SetProperty(ref _mainMenuVM, value);RaisePropertyChanged(() => MainMenuVM);}}公共 MvxCommand ShowMainMenuCommand { 获取;放;}公共无效 ShowMainMenu(){MainMenuVM = (MainMenuViewModel)_mvxViewModelLoader.LoadViewModel(MvxViewModelRequest.GetDefaultRequest(typeof(MainMenuViewModel)), null, null);}}}我想在内容控件中显示的简化视图如下所示:
<网格></网格></views:MvxWpfView>还有相应的 ViewModel.
使用 MvvmCross.Logging;使用 MvvmCross.Navigation;使用 MvvmCross.ViewModels;命名空间 MvvmCrossTest.Core.ViewModels{公共类 MainMenuViewModel : MvxNavigationViewModel{public MainMenuViewModel(IMvxLogProvider logProvider, IMvxNavigationService navigationService) : base(logProvider, navigationService){}}}我看到的是MvvmCrossTest.Core.ViewModels.MainMenuViewModel"的文字,而不是 View/ViewModel.
我不想使用 Xamarin!
解决方案我创建了一个项目,其中我向您展示一些基础知识.
简单您可以在此处找到示例.>
RootView;
扩展(自定义演示者)
使用此自定义 wpf 演示器,您可以在容器中指定它们时轻松导航到视图.这样,您就可以在使用 mvvmcross 导航服务时从视图模型关闭和打开视图.
我从另一个项目复制了这个.您可以在我的示例项目此处中找到整个实现.
RootView;
<网格></网格></views:MvxWpfView>后面的RootView代码;
[MvxContentPagePresentation(WrapInNavigationPage = true, NoHistory = false)]公共部分类 RootView:MvxWpfView{公共根视图(){初始化组件();}}RootViewModel;
公共类RootViewModel:MvxNavigationViewModel{私有只读 IMvxNavigationService _navigationService;公共 IMvxAsyncCommand ShowNestedViewModelCommand { 获取;保护集;}公共 RootViewModel(IMvxLogProvider logProvider, IMvxNavigationService navigationService) : base(logProvider, navigationService){this._navigationService = 导航服务;//导航到嵌套视图this.ShowNestedViewModelCommand = new MvxAsyncCommand(() => this._navigationService.Navigate());ShowNestedViewModelCommand.Execute();}}后面的NestedView代码;
[MvxWpfPresenter(RootViewRegion", mvxViewPosition.NewOrExsist)]公共部分类 NestedView : MvxWpfView{公共嵌套视图(){初始化组件();}}很高兴知道
当您遇到导航和视图模型连接问题时,请使用后面的代码.它加载特定视图的视图模型;
[MvxContentPagePresentation(WrapInNavigationPage = true, NoHistory = false)]公共部分类 SomeView : MvxWpfView{公共 SomeView(){初始化组件();if (!(ViewModel 是 ViewModels.SomeViewModel)){if (Mvx.IoCProvider.TryResolve(out var someViewModel)){ViewModel = someViewModel;返回;}var _viewModelLoader = Mvx.IoCProvider.Resolve();var request = new MvxViewModelInstanceRequest(typeof(ViewModels.SomeViewModel));request.ViewModelInstance = _viewModelLoader.LoadViewModel(request, null);ViewModel = request.ViewModelInstance as ViewModels.SomeViewModel;Mvx.IoCProvider.RegisterSingleton(ViewModel);}}}I'm pretty new in MvvmCross but I'm working with mvvm for awhile. I know how to compose usercontrols with nested usercontrols. Now with mvvmcross I got stucked to show two or more usercontrols in another usercontrol. I don't use any other framework than MvvmCross. My Rootview looks like this:
`<views:MvxWpfView x:Class="MvvmCrossTest.Wpf.Views.RootView" xmlns:views="clr-namespace:MvvmCross.Platforms.Wpf.Views;assembly=MvvmCross.Platforms.Wpf" xmlns="schemas.microsoft/winfx/2006/xaml/presentation" xmlns:x="schemas.microsoft/winfx/2006/xaml" xmlns:mc="schemas.openxmlformats/markup-compatibility/2006" xmlns:d="schemas.microsoft/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <DockPanel> <TextBlock Text="Root" DockPanel.Dock="Top"/> <ContentControl x:Name="MainMenuVM" Content="{Binding MainMenuVM}" DockPanel.Dock="Top" /> </DockPanel> </views:MvxWpfView>`The corresponding ViewModel looks like this:
using MvvmCross.Commands; using MvvmCross.Logging; using MvvmCross.Navigation; using MvvmCross.ViewModels; namespace MvvmCrossTest.Core.ViewModels { public class RootViewModel: MvxNavigationViewModel { private readonly IMvxViewModelLoader _mvxViewModelLoader; public RootViewModel(IMvxLogProvider logProvider, IMvxNavigationService navigationService, IMvxViewModelLoader mvxViewModelLoader) : base(logProvider, navigationService) { _mvxViewModelLoader = mvxViewModelLoader; ShowMainMenu(); } private MainMenuViewModel _mainMenuVM; public MainMenuViewModel MainMenuVM { get { return _mainMenuVM; } set { SetProperty(ref _mainMenuVM, value); RaisePropertyChanged(() => MainMenuVM); } } public MvxCommand ShowMainMenuCommand { get; set; } public void ShowMainMenu() { MainMenuVM = (MainMenuViewModel)_mvxViewModelLoader.LoadViewModel(MvxViewModelRequest.GetDefaultRequest(typeof(MainMenuViewModel)), null, null); } } }The simplified View I want to show in the contentcontrol looks like this:
<views:MvxWpfView x:Class="MvvmCrossTest.Wpf.Views.MainMenuView" xmlns:views="clr-namespace:MvvmCross.Platforms.Wpf.Views;assembly=MvvmCross.Platforms.Wpf" xmlns="schemas.microsoft/winfx/2006/xaml/presentation" xmlns:x="schemas.microsoft/winfx/2006/xaml" xmlns:mc="schemas.openxmlformats/markup-compatibility/2006" xmlns:d="schemas.microsoft/expression/blend/2008" mc:Ignorable="d" Background="Aqua" d:DesignHeight="450" d:DesignWidth="800"> <Grid> </Grid> </views:MvxWpfView>And also the corresponding ViewModel.
using MvvmCross.Logging; using MvvmCross.Navigation; using MvvmCross.ViewModels; namespace MvvmCrossTest.Core.ViewModels { public class MainMenuViewModel : MvxNavigationViewModel { public MainMenuViewModel(IMvxLogProvider logProvider, IMvxNavigationService navigationService) : base(logProvider, navigationService) { } } }Instead of the View/ViewModel I see a text that says "MvvmCrossTest.Core.ViewModels.MainMenuViewModel".
I don't want to use Xamarin!
解决方案I created a project where I show you some basics.
simpleYou can find the samples here.
the RootView;
<views:MvxWpfView xmlns:local="clr-namespace:SomeProject.Views" ...> <Grid> <Label Content="Hello from RootView" /> <local:NestedView /> </Grid> </views:MvxWpfView>the NestedView;
<views:MvxWpfView ...> <Grid> <Label Content="Hello from NestedView" /> </Grid> </views:MvxWpfView>extended (custom presenter)
With this custom wpf presenter you can easily navigate to views while specified themn in a container. With that, you can close and open views from the view model while using the mvvmcross navigation service.
I copied this from another project. You can find the whole implementation in my sample project here.
the RootView;
<views:MvxWpfView ...> <Grid> <Label Content="Hello" /> <ItemsControl region:MvxContainer.Id="RootViewRegion"/> </Grid> </views:MvxWpfView>the RootView code behind;
[MvxContentPagePresentation(WrapInNavigationPage = true, NoHistory = false)] public partial class RootView: MvxWpfView<RootViewModel> { public RootView() { InitializeComponent(); } }the RootViewModel;
public class RootViewModel: MvxNavigationViewModel { private readonly IMvxNavigationService _navigationService; public IMvxAsyncCommand ShowNestedViewModelCommand { get; protected set; } public RootViewModel(IMvxLogProvider logProvider, IMvxNavigationService navigationService) : base(logProvider, navigationService) { this._navigationService = navigationService; // navigate to nested view this.ShowNestedViewModelCommand = new MvxAsyncCommand(() => this._navigationService.Navigate<NestedViewModel>()); ShowNestedViewModelCommand.Execute(); } }the NestedView code behind;
[MvxWpfPresenter("RootViewRegion", mvxViewPosition.NewOrExsist)] public partial class NestedView : MvxWpfView<NestedViewModel> { public NestedView() { InitializeComponent(); } }good to know
when you have problems with navigation and view model connection use this code behind. It loads the viewmodel for the specific view;
[MvxContentPagePresentation(WrapInNavigationPage = true, NoHistory = false)] public partial class SomeView : MvxWpfView<ViewModels.SomeViewModel> { public SomeView() { InitializeComponent(); if (!(ViewModel is ViewModels.SomeViewModel)) { if (Mvx.IoCProvider.TryResolve<ViewModels.SomeViewModel>(out var someViewModel)) { ViewModel = someViewModel; return; } var _viewModelLoader = Mvx.IoCProvider.Resolve<IMvxViewModelLoader>(); var request = new MvxViewModelInstanceRequest(typeof(ViewModels.SomeViewModel)); request.ViewModelInstance = _viewModelLoader.LoadViewModel(request, null); ViewModel = request.ViewModelInstance as ViewModels.SomeViewModel; Mvx.IoCProvider.RegisterSingleton<ViewModels.SomeViewModel>(ViewModel); } } }
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