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POMEF [ImportingConstructor] not called until [Import(AllowDefault = true)] is used
 

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  1. POMEF [ImportingConstructor] not called until [Import(AllowDefault = true)] is used
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    <p>I am using MEF1 and running in to an odd scenerio.</p> <p>This constructor is never called:</p> <pre><code>[ImportingConstructor] public LogViewModuleRoot(INavigationCommandManager navigationCommandManager, ISettingsManager settingsManager, IBusyService busyService) { NavigationCommandManager = navigationCommandManager; SettingsManager = settingsManager; BusyService = busyService; } </code></pre> <p>While the constructor is called with the correct value when changed to this:</p> <pre><code>[ImportingConstructor] public LogViewModuleRoot(INavigationCommandManager navigationCommandManager, ISettingsManager settingsManager, [Import(AllowDefault = true)] IBusyService busyService) { NavigationCommandManager = navigationCommandManager; SettingsManager = settingsManager; BusyService = busyService; // Properly hydrated - i.e. not null } </code></pre> <p>Typically, an ImportingConstructor does not get called if there is not a matching export, but if there was no matching export, then it would not be able to load when <em>AllowDefault</em> is set to <em>true</em> either.</p> <p>What issues could cause this behavior?</p> <p>If this has to do with a circular dependency within the composition graph and the timing of the construction of the <em>IBusyService</em>, are there tools to find the root of the problem?</p> <h3>Update</h3> <p>It seems like there is no deep circular dependency. Even when the export of <code>IBusyService</code> has no imports of it's own the problem still exists. Also note, the instance of <code>IBusyService</code> that is exported is loaded long before this <code>ImportingConstructor</code> tries to run.</p> <h3>Additional Information</h3> <p>Using MEFX Visualizer, both cases show that there are no composition problems and that all imports are satisfied.</p> <p>This is the output of MEFX CompositionInfo:</p> <pre><code>[Part] ****.Modularity.Logging.CallbackLogger from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Logging.CallbackLogger (ContractName="****.Modularity.Logging.CallbackLogger") [Part] ****.Modularity.Modules.ModuleManager from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Modules.ModuleManager (ContractName="****.Modularity.Modules.IModuleManager") [Import] ****.Modularity.Modules.ModuleManager.ImportedModules (ContractName="****.Modularity.IModule") [SatisfiedBy] Debug.Module.ModuleRoot (ContractName="****.Modularity.IModule") from: Debug.Module.ModuleRoot from: AssemblyCatalog (Assembly="Debug.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Unsuitable] Logging.Module.LogConfigurationModuleRoot (ContractName="****.Modularity.IModule") from: Logging.Module.LogConfigurationModuleRoot from: AssemblyCatalog (Assembly="Logging.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Unsuitable] Logging.Module.LogViewModuleRoot (ContractName="****.Modularity.IModule") from: Logging.Module.LogViewModuleRoot from: AssemblyCatalog (Assembly="Logging.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Modules.ModuleManager..ctor (Parameter="moduleCatalog", ContractName="****.Modularity.Modules.IModuleCatalog") [SatisfiedBy] ****.Modularity.Modules.IModuleCatalog [Import] ****.Modularity.Modules.ModuleManager..ctor (Parameter="logger", ContractName="****.Modularity.Logging.ILogger") [SatisfiedBy] ****.Modularity.Logging.ILogger [Import] ****.Modularity.Modules.ModuleManager..ctor (Parameter="exServiceLocator", ContractName="****.Modularity.IExtendedServiceLocator") [SatisfiedBy] ****.Modularity.IExtendedServiceLocator [Part] ****.Modularity.Shells.ConsoleShell from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Shells.ConsoleShell (ContractName="****.Modularity.Shells.ConsoleShell") [Import] ****.Modularity.Shells.ConsoleShell..ctor (Parameter="navigationManager", ContractName="****.Modularity.Windows.Navigation.INavigationManager") [SatisfiedBy] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") from: ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.ConsoleShell..ctor (Parameter="logger", ContractName="****.Modularity.Logging.CallbackLogger") [SatisfiedBy] ****.Modularity.Logging.CallbackLogger (ContractName="****.Modularity.Logging.CallbackLogger") from: ****.Modularity.Logging.CallbackLogger from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.ConsoleShell..ctor (Parameter="locator", ContractName="****.Modularity.IExtendedServiceLocator") [SatisfiedBy] ****.Modularity.IExtendedServiceLocator [Import] ****.Modularity.Shells.ConsoleShell..ctor (Parameter="viewModel", ContractName="****.Modularity.Shells.ViewModel.ShellViewModel") [SatisfiedBy] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Shells.ViewModel.ShellViewModel") from: ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Part] ****.Modularity.Shells.****LegacyNavigation from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Shells.****LegacyNavigation (ContractName="****.Modularity.Shells.****LegacyNavigation") [Import] ****.Modularity.Shells.****LegacyNavigation..ctor (Parameter="navigationManager", ContractName="****.Modularity.Windows.Navigation.INavigationManager") [SatisfiedBy] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") from: ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.****LegacyNavigation..ctor (Parameter="logger", ContractName="****.Modularity.Logging.CallbackLogger") [SatisfiedBy] ****.Modularity.Logging.CallbackLogger (ContractName="****.Modularity.Logging.CallbackLogger") from: ****.Modularity.Logging.CallbackLogger from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.****LegacyNavigation..ctor (Parameter="locator", ContractName="****.Modularity.IExtendedServiceLocator") [SatisfiedBy] ****.Modularity.IExtendedServiceLocator [Import] ****.Modularity.Shells.****LegacyNavigation..ctor (Parameter="dataContext", ContractName="****.Modularity.Windows.Shell.IShellDataContext") [SatisfiedBy] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.Shell.IShellDataContext") from: ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Part] ****.Modularity.Shells.KioskShell from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Shells.KioskShell (ContractName="****.Modularity.Shells.KioskShell") [Import] ****.Modularity.Shells.KioskShell..ctor (Parameter="navigationManager", ContractName="****.Modularity.Windows.Navigation.INavigationManager") [SatisfiedBy] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") from: ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.KioskShell..ctor (Parameter="logger", ContractName="****.Modularity.Logging.CallbackLogger") [SatisfiedBy] ****.Modularity.Logging.CallbackLogger (ContractName="****.Modularity.Logging.CallbackLogger") from: ****.Modularity.Logging.CallbackLogger from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.KioskShell..ctor (Parameter="dataContext", ContractName="****.Modularity.Windows.Shell.IShellDataContext") [SatisfiedBy] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.Shell.IShellDataContext") from: ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Part] ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.Shell.IShellDataContext") [Export] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.Commanding.INavigationContext") [Export] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.IBusyService") [Export] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Shells.ViewModel.ShellViewModel") [Import] ****.Modularity.Shells.ViewModel.ShellViewModel..ctor (Parameter="navigationCommandManager", ContractName="****.Modularity.Windows.Commanding.INavigationCommandManager") [SatisfiedBy] ****.Modularity.Windows.Commanding.INavigationCommandManager [Unsuitable] ****.Modularity.Windows.Commanding.NavigationCommandManager (ContractName="****.Modularity.Windows.Commanding.INavigationCommandManager") from: ****.Modularity.Windows.Commanding.NavigationCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.ViewModel.ShellViewModel..ctor (Parameter="menuCommandManager", ContractName="****.Modularity.Windows.IMenuCommandManager") [SatisfiedBy] ****.Modularity.Windows.Commanding.MenuCommandManager (ContractName="****.Modularity.Windows.IMenuCommandManager") from: ****.Modularity.Windows.Commanding.MenuCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.ViewModel.ShellViewModel..ctor (Parameter="applicationInformation", ContractName="****.Modularity.Shells.IApplicationInformation") [SatisfiedBy] ****.Modularity.Shells.IApplicationInformation [Import] ****.Modularity.Shells.ViewModel.ShellViewModel..ctor (Parameter="manager", ContractName="****.Modularity.Modules.IModuleManager") [SatisfiedBy] ****.Modularity.Modules.ModuleManager (ContractName="****.Modularity.Modules.IModuleManager") from: ****.Modularity.Modules.ModuleManager from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Shells.ViewModel.ShellViewModel..ctor (Parameter="actionExecuter", ContractName="****.Modularity.IActionExecuter") [SatisfiedBy] ****.Modularity.IActionExecuter [Part] ****.Modularity.Windows.Commanding.MenuCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Windows.Commanding.MenuCommandManager (ContractName="****.Modularity.Windows.IMenuCommandManager") [Import] ****.Modularity.Windows.Commanding.MenuCommandManager..ctor (Parameter="moduleManager", ContractName="****.Modularity.Modules.IModuleManager") [SatisfiedBy] ****.Modularity.Modules.ModuleManager (ContractName="****.Modularity.Modules.IModuleManager") from: ****.Modularity.Modules.ModuleManager from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Windows.Commanding.MenuCommandManager..ctor (Parameter="navigationManager", ContractName="****.Modularity.Windows.Navigation.INavigationManager") [SatisfiedBy] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") from: ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Part] ****.Modularity.Windows.Commanding.NavigationCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Windows.Commanding.NavigationCommandManager (ContractName="****.Modularity.Windows.Commanding.INavigationCommandManager") [Import] ****.Modularity.Windows.Commanding.NavigationCommandManager..ctor (Parameter="moduleManager", ContractName="****.Modularity.Modules.IModuleManager") [SatisfiedBy] ****.Modularity.Modules.ModuleManager (ContractName="****.Modularity.Modules.IModuleManager") from: ****.Modularity.Modules.ModuleManager from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Windows.Commanding.NavigationCommandManager..ctor (Parameter="navigationManager", ContractName="****.Modularity.Windows.Navigation.INavigationManager") [SatisfiedBy] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") from: ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Part] ****.Modularity.Windows.Commanding.MenuNavigationCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Windows.Commanding.MenuNavigationCommandManager (ContractName="****.Modularity.Windows.Commanding.MenuNavigationCommandManager") [Import] ****.Modularity.Windows.Commanding.MenuNavigationCommandManager..ctor (Parameter="moduleManager", ContractName="****.Modularity.Modules.IModuleManager") [SatisfiedBy] ****.Modularity.Modules.ModuleManager (ContractName="****.Modularity.Modules.IModuleManager") from: ****.Modularity.Modules.ModuleManager from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Windows.Commanding.MenuNavigationCommandManager..ctor (Parameter="navigationManager", ContractName="****.Modularity.Windows.Navigation.INavigationManager") [SatisfiedBy] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") from: ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] ****.Modularity.Windows.Commanding.MenuNavigationCommandManager..ctor (Parameter="menuCommandManager", ContractName="****.Modularity.Windows.IMenuCommandManager") [SatisfiedBy] ****.Modularity.Windows.Commanding.MenuCommandManager (ContractName="****.Modularity.Windows.IMenuCommandManager") from: ****.Modularity.Windows.Commanding.MenuCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Part] ****.Modularity.Windows.Navigation.NavigationManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Export] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Framework.ViewModel.INavigationService") [Export] ****.Modularity.Windows.Navigation.NavigationManager (ContractName="****.Modularity.Windows.Navigation.INavigationManager") [Import] ****.Modularity.Windows.Navigation.NavigationManager..ctor (Parameter="moduleManager", ContractName="****.Modularity.Modules.IModuleManager") [SatisfiedBy] ****.Modularity.Modules.ModuleManager (ContractName="****.Modularity.Modules.IModuleManager") from: ****.Modularity.Modules.ModuleManager from: AssemblyCatalog (Assembly="****.Modularity.Mef, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Part] Logging.Module.LogConfigurationModuleRoot from: AssemblyCatalog (Assembly="Logging.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] Logging.Module.LogConfigurationModuleRoot (ContractName="****.Modularity.IModule") [Import] Logging.Module.LogConfigurationModuleRoot..ctor (Parameter="logConfiguration", ContractName="Logging.ViewModel.Interfaces.ILogConfiguration") [SatisfiedBy] Logging.ViewModel.LogConfigurationViewModel (ContractName="Logging.ViewModel.Interfaces.ILogConfiguration") from: Logging.ViewModel.LogConfigurationViewModel from: AssemblyCatalog (Assembly="Logging.ViewModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Part] Logging.Module.LogViewModuleRoot from: AssemblyCatalog (Assembly="Logging.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] Logging.Module.LogViewModuleRoot (ContractName="****.Modularity.IModule") [Import] Logging.Module.LogViewModuleRoot..ctor (Parameter="navigationCommandManager", ContractName="****.Modularity.Windows.Commanding.INavigationCommandManager") [SatisfiedBy] ****.Modularity.Windows.Commanding.INavigationCommandManager [Unsuitable] ****.Modularity.Windows.Commanding.NavigationCommandManager (ContractName="****.Modularity.Windows.Commanding.INavigationCommandManager") from: ****.Modularity.Windows.Commanding.NavigationCommandManager from: AssemblyCatalog (Assembly="****.Modularity.Windows, Version=2.4.0.347, Culture=neutral, PublicKeyToken=null") [Import] Logging.Module.LogViewModuleRoot..ctor (Parameter="settingsManager", ContractName="****.Modularity.ISettingsManager") [SatisfiedBy] ****.Modularity.ISettingsManager [Import] Logging.Module.LogViewModuleRoot..ctor (Parameter="busyService", ContractName="****.Modularity.Windows.IBusyService") [SatisfiedBy] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.IBusyService") from: ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Part] Logging.ViewModel.LogConfigurationViewModel from: AssemblyCatalog (Assembly="Logging.ViewModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] Logging.ViewModel.LogConfigurationViewModel (ContractName="Logging.ViewModel.Interfaces.ILogConfiguration") [Import] Logging.ViewModel.LogConfigurationViewModel..ctor (Parameter="viewModelManager", ContractName="****.Framework.ViewModel.ViewModelManager") [SatisfiedBy] ****.Framework.ViewModel.ViewModelManager [Import] Logging.ViewModel.LogConfigurationViewModel..ctor (Parameter="settingsManager", ContractName="****.Modularity.ISettingsManager") [SatisfiedBy] ****.Modularity.ISettingsManager [Import] Logging.ViewModel.LogConfigurationViewModel..ctor (Parameter="busyService", ContractName="****.Modularity.Windows.IBusyService") [SatisfiedBy] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.IBusyService") from: ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Import] Logging.ViewModel.LogConfigurationViewModel..ctor (Parameter="actionExecuter", ContractName="****.Modularity.IActionExecuter") [SatisfiedBy] ****.Modularity.IActionExecuter [Part] Debug.Module.ModuleRoot from: AssemblyCatalog (Assembly="Debug.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Export] Debug.Module.ModuleRoot (ContractName="****.Modularity.IModule") [Import] Debug.Module.ModuleRoot..ctor (Parameter="container", ContractName="System.ComponentModel.Composition.Hosting.CompositionContainer") [SatisfiedBy] System.ComponentModel.Composition.Hosting.CompositionContainer [Import] Debug.Module.ModuleRoot..ctor (Parameter="catalogs", ContractName="System.ComponentModel.Composition.Primitives.ComposablePartCatalog") [SatisfiedBy] System.ComponentModel.Composition.Primitives.ComposablePartCatalog [Import] Debug.Module.ModuleRoot..ctor (Parameter="shell", ContractName="****.Modularity.Windows.Shell.IShellDataContext") [SatisfiedBy] ****.Modularity.Shells.ViewModel.ShellViewModel (ContractName="****.Modularity.Windows.Shell.IShellDataContext") from: ****.Modularity.Shells.ViewModel.ShellViewModel from: AssemblyCatalog (Assembly="****.Modularity.Shells, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null") [Import] Debug.Module.ModuleRoot..ctor (Parameter="settingsManager", ContractName="****.Modularity.ISettingsManager") [SatisfiedBy] ****.Modularity.ISettingsManager </code></pre>
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      1. POMEF [ImportingConstructor] not called until [Import(AllowDefault = true)] is used
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      1. POMEF [ImportingConstructor] not called until [Import(AllowDefault = true)] is used
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      1. POMEF [ImportingConstructor] not called until [Import(AllowDefault = true)] is used
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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