Prism 6.1 ViewModel定位器不会实例化我的ViewModel
本文关键字:ViewModel 实例化 我的 定位器 Prism | 更新日期: 2023-09-27 18:37:15
我最近刚刚建立了一个新项目,使用Prism 6.1(与Unity)。
我有我的引导程序:
public class ServerBootstrapper : UnityBootstrapper
{
protected override DependencyObject CreateShell()
{
return Container.Resolve<MainShell>();
}
protected override void InitializeShell()
{
base.InitializeShell();
Application.Current.MainWindow = (Window)Shell;
Application.Current.MainWindow.Show();
}
protected override void ConfigureModuleCatalog()
{
base.ConfigureModuleCatalog();
ModuleCatalog catalog = (ModuleCatalog)ModuleCatalog;
catalog.AddModule(typeof(ServerUIModule));
}
}
MainShell:
<Window.Resources>
<Style TargetType="TabItem">
<Setter Property="Header" Value="{Binding DataContext.Title}" />
</Style>
</Window.Resources>
<DockPanel LastChildFill="True">
<TabControl regions:RegionManager.RegionName="{x:Static infrastructure:RegionsNames.MAIN_TAB_REGION}" />
</DockPanel>
我的模块定义:
public class ServerUIModule : IModule
{
private readonly IRegionManager m_regionManager;
public ServerUIModule( IRegionManager regionManager)
{
m_container = container;
m_regionManager = regionManager;
}
public void Initialize()
{
m_regionManager.RegisterViewWithRegion(RegionsNames.MAIN_TAB_REGION, typeof(StatusView));
m_regionManager.RegisterViewWithRegion(RegionsNames.MAIN_TAB_REGION, typeof(LogMessagesView));
}
}
我的状态视图:
<UserControl x:Class="Xms.Server.UI.Views.StatusView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Xms.Server.UI.Views"
xmlns:mvvm="http://prismlibrary.com/"
xmlns:statusControl="clr-namespace:Xms.Server.UI.Views.StatusControl"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" Background="Aquamarine" mvvm:ViewModelLocator.AutoWireViewModel="True">
<Grid>
<TextBlock>Content</TextBlock>
</Grid>
</UserControl>
对应的视图模型:
public class StatusViewModel : BindableBase
{
public String Title => LocalizedResources.StatusModuleTitle;
public StatusViewModel()
{
//This constructor is never called
}
}
问题是我的构造函数从未被调用,我的数据上下文未设置。
我该如何调试?我可能做错了什么?
首先,确保视图分别驻留在 Views
命名空间中,视图模型分别驻留在 ViewModels
中。
其次,调试此类内容的最简单方法是从 prism 源中复制一些代码并将其放入MyBootstrapper.ConfigureContainer
:
ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver( x =>
{
var viewName = x.FullName;
viewName = viewName.Replace( ".Views.", ".ViewModels." );
var viewAssemblyName = x.GetTypeInfo().Assembly.FullName;
var suffix = viewName.EndsWith( "View" ) ? "Model" : "ViewModel";
var viewModelName = string.Format( CultureInfo.InvariantCulture, "{0}{1}, {2}", viewName, suffix, viewAssemblyName );
return Type.GetType( viewModelName );
} );
ViewModelLocationProvider.SetDefaultViewModelFactory( type => Container.Resolve( type ) );
。并在那里放置断点以确切地查看问题所在。或者,深入了解您XamlParseException
的InnerException
...在大约第三层,你应该找到真正的问题。但我发现我的断点方法更方便。