How to run msgbox as service with MVVM toolkit "dependencyinjection"

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When I try

Dim msgBoxService As IMsgBoxService = Ioc.[Default].GetService(Of IMsgBoxService)()
msgBoxService.Show("TEST")

I get error "The service provider has not been configured yet"

27.01.2022 13:31:20; System.InvalidOperationException: The service provider has not been configured yet
   bei Microsoft.Toolkit.Mvvm.DependencyInjection.Ioc.GetService[T]() in /_/Microsoft.Toolkit.Mvvm/DependencyInjection/Ioc.cs:Zeile 90.
   bei WinformHostsRibbonWPF_MVVM_Toolkit.TextDataViewModel..ctor() in E:\Daten\VSCommunity\Projects\VS2022_Articles_CP\WinformHostsRibbonWPF_MVVM_Toolkit\ViewModels\TextDataViewModel.vb:Zeile 47.

What I have tried:

When I try

Ioc.[Default].ConfigureServices(New ServiceCollection().AddSingleton(Of IMsgBoxService, MsgBoxService)().AddSingleton(Of IMsgBoxService)(New MsgBoxService()).BuildServiceProvider())
Dim msgBoxService As IMsgBoxService = Ioc.[Default].GetService(Of IMsgBoxService)()
msgBoxService.Show("TEST")

Then the error is "The default service provider has already been configured"

27.01.2022 13:34:27; System.InvalidOperationException: The default service provider has already been configured
   bei Microsoft.Toolkit.Mvvm.DependencyInjection.Ioc.ConfigureServices(IServiceProvider serviceProvider) in /_/Microsoft.Toolkit.Mvvm/DependencyInjection/Ioc.cs:Zeile 139.
   bei WinformHostsRibbonWPF_MVVM_Toolkit.TextDataViewModel..ctor() in E:\Daten\VSCommunity\Projects\VS2022_Articles_CP\WinformHostsRibbonWPF_MVVM_Toolkit\ViewModels\TextDataViewModel.vb:Zeile 46.

Posted 27-Jan-22 1:37am

Jo_vb.net

Updated 27-Jan-22 2:30am

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Richard Deeming · Accepted Answer · 2022-01-27T02:30:00

Solution 1

From the error, it looks like you're creating multiple instances of the TextDataViewModel class, which means you're trying to call ConfigureServices multiple times.

Move the DI configuration to the Application constructor, so that it only runs once during the lifetime of the process.

Posted 27-Jan-22 2:30am

Richard Deeming

Comments

Jo_vb.net 27-Jan-22 8:38am

Thank you very much.
That was the case, now it works fine.