Visual Studio provides a "Background Application (IoT)" template which i want to use to create a headless webservice. To persist some data i want to use Entity Framework with SQLite as DB-Engine .
After upgrading UWP to 5.2.2 and installing Sqlite and EFCore.Tools and adding a DbContext i wanted to migrate the first version. It fails:
PM> Add-Migration MyFirstMigration
Project 'BackgroundApplication4' is a Windows Runtime component. The Entity Framework Core Package Manager Console Tools don't support this type of project.
I thinks it's not a problem with EF itself, because it worked for me with a simple "Blank App". Now there are some questions coming up: Is a "Background Application" really a WinRT-Component and has a different (unsupported) handling by EF?
I thought UWP is an extension of WinRT so basically each UWP-App must be a WinRT-Component?
EF in a Windows Runtime component is a no-go; but that is not so bad since WinRT component can depend on class libraries. So move all your EF classes to a own class libary and consume that library from your background task in your Windows Runtime component.
By doing this you can also use the same class library also in the foreground app when needed.
P.s. Check the github page of EFCore and UWP. There are lot of issues especially in combination with .net native. so using EF.core in UWP will cause you lot of headache; but it is possible.
Related
I try to run my Avalonia app on .net framework. However, when I downgrade targetframework to netstandard2.0, AppBuilder becomes unavailable and I just couldn't figure out, how to fix that problem.
I couldn't find any template, that targets .net framework or netstandard. Documentation contains nothing regarding this issue. The only thing I could find is this Github issue. As I understood, AppBuilder is not supposed to be used in netstandard. Then, what is proper replacement for following code?
public static AppBuilder BuildAvaloniaApp()
=> AppBuilder.Configure<App>()
.UsePlatformDetect()
.LogToTrace()
.UseReactiveUI();
Edit:
As it was pointed out, netstandard can't be used as a target for Avalonia apps, but we can specify multiple targets. So I replaced
<TargetFramework>net7.0</TargetFramework>
with
<TargetFrameworks>net7.0;net48</TargetFrameworks>
And it worked on .NET core and .NET Framework
netstandard2.0 isn't an actual .NET framework version: it's a specification of the common API beteen .NET framework 4.6.1 and .NET core 2.0 (among others). As such netstandard2.0 only makes sense as the target framework for libraries, not applications.
If you want your app to target .NET framework then you need to use a .NET framework version as the target framework, for example net48 for .NET Framework 4.8.
I'm working on a UWP app (C++/WinRT) that must communicate extensively with a background process. Unfortunately, the background process must remain a full trust "Win32" process. Both are packaged in an MSIX.
For performance and programmability reasons, my first choice would be to turn the background process into an out-of-process WinRT component. App Services is a possibility but not ideal.
I've found numerous code samples for creating an OOP WinRT component via WRL. However, activation is performed via CoreApplication::RunWithActivationFactories(), which (as far as I know) requires an AppContainer.
I know I can consume a WinRT component in a Win32 process. Can I create one? If so, what would activation look like in C++/WinRT?
Yes, from the Windows 10 Version 1903, May 2019 Update, the windows have added support for non-packaged desktop apps to make use of user-defined (3rd party) Windows Runtime (WinRT) Components, which means that we can consume a Winrt component from the Win32 process directly. To successfully reference a C++ Windows Runtime component from a Win32 app, you need to use C++/WinRT to generate projection header files of your component. You can then include these header files in your app code to call your component.
For the detailed information, please refer to this article:
https://blogs.windows.com/windowsdeveloper/2019/04/30/enhancing-non-packaged-desktop-apps-using-windows-runtime-components/.
For the detailed sample, please refer to here:
https://github.com/microsoft/RegFree_WinRT/tree/master/Cpp.
Thanks.
I installed the GtkSharp 3.22.24.36 package via Project > Add NuGet Packages..., which completed successfully. But now Monodevelop can't decide which version of GtkSharp to use (3.22.24.36 or the in-built one, 2.12).
If I uncheck gtk-sharp in the Edit references... dialog, it tells me that I can't use the UI designer without it.
How do I get Monodevelop to use the downloaded GtkSharp (3.22)?
MonoDevelop comes with a custom version of Gtk2 + Xwt bundled. If you plan to use Gtk3, then the designer must be deactivated, since it won't work with Gtk3.
My advice, anyway, no matter which toolkit you use, is to avoid using the designer. As soon as you involve the designer, you code heavily depends on the IDE you use (Visual Studio, MonoDevelop, NetBeans... you name it).
Creating user interfaces "by hand" is no longer traumatic as it was in the 90's with the Windows API. For example, you can find a very good Gtk# tutorial in ZetCode.
User Interface Toolkits are actually very similar, they change the name of widgets and sometimes provide a slightly different layout, but they are all mostly the same, no matter it is WinForms or Gtk(for C#), Swing (Java), or Qt (C++ and others).
I know its an older question but things changed. Abandon MonoDevelop, just use the .NET Standard bound implementation of GtkSharp. You can then literally design interface using glade xml files, using official Glade application from GTK+. You can find it here.
With the current push from MS to abandon Framework in favor of Core, we finally succumbed when we figured out they will kill Framework (which they just did with .NET 5 announcement), but we also used the opportunity to investigate other options for our ports of LoBs to core. We discovered GtkSharp as WinForms replacement and AvaloniaUI as WPF replacement, which not only work perfectly but also truly work cross-platform. We ported several applications already and actually moved more then half of business work stations from Windows to Linux.
I need to make a Windows Store application that exchanges xml serialized data over a TCP connection with a server. Since I need to use Direct3D rendering in the application I went for the c++/cx store application template however I ran into issues with xml serialization/deserialization.
My usual approach in C# would be to use the XmlSerializer and classes with DataContractAttribute annotations. However as soon as I try to import System.Xml.Serialization assembly I get the C1114 error - WinRT does not support #using of a managed assembly. However there are lots of examples that mention using this approach in a Windows Phone app from C#.
So the question is - is only c++/cx limited in support for .NET in Windows Store applications and C# can use all the standard components on phone as well or is switching to C# in this case also not a solution and I need to use the WinRT classes for xml serialization/deserialization?
Your confusion is understandable, what with the variety of frameworks Microsoft has put out there.
C++/Cx is a native binding to the Windows Runtime (WinRT). It does not use any managed code or the .NET framework in any way, which is why you're getting the C1114 error.
C# provides a managed binding to WinRT. It does leverage the .NET framework, so in a C# Windows Store application, you can make use of some of the base-class library. This subset is referred to as the .NET Profile. This article talks about this more: http://blogs.msdn.com/b/dotnet/archive/2012/04/17/net-for-metro-style-apps.aspx
In your specific case, you are using a C++/Cx application because you want access to Direct3D. This makes sense, although it means that you will not have access to System.Xml.Serialization. Instead, as you surmised, you will need to use APIs that are available to C++/Cx to read XML, specifically Windows.Data.Xml.Dom: https://msdn.microsoft.com/en-us/library/windows/apps/windows.data.xml.dom.aspx
I want to use Mvvmcross to make application for several platforms.
I use Profile 104 for PCL library like Mvvmcross, but this profile target .NET 4.5.
I want to target .NET 4.0 to use my application on Windows XP.
To do that, I add the xml files
MonoAndroid, Version = v1.6 +. Xml
and
VSMonoTouch, Version = v1.0 +. Xml
in the profile 143 which allows me to target. NET framework 4.0.3.
However, I have a compilation error because it can not find the ICommand interface.
This interface is not in the same library between version 4.0 and 4.5, is it why it doesn't work ?
Or should I recompile all Mvvmcross libraries with profile 143?
thanks,
This is a Portable Class Library limitation.
See the table on: http://msdn.microsoft.com/en-us/library/gg597391.aspx
Model-View-View Model (MVVM)
Only 4.5
This means that if anyone wants to use MvvmCross on earlier .Net platforms then someone has to build and maintain a non-PCL version.
Since the maintainer of Mvx (me!) has decided to only maintain PCL versions of MvvmCross, then any non-PCL support will have to be created by the community.
For WPF this shouldn't be too large or difficult a job - but it might be...
Alternatively, somebody might be able to do something funky to get the ICommand working... I've retagged this question with portable-class-library to try to lure in some of the MS experts.