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                                  • Hi Guys,

                                    today i wanted to play around with netcore and netstandard. so i tought i convert an basic module to netstandard - and leave the rest on netcoreapp. result is that i cannot start the application anymore. seems like some kind of DLL hell?

                                    System.TypeInitializationException: "The type initializer for 'DevExpress.LookAndFeel.UserLookAndFeel' threw an exception."
                                    MissingMethodException: Method not found: 'Void DevExpress.Utils.Text.StringParser.RegisterColorConverter(System.Drawing.ColorConverter)'.

                                    attached is the modified sample project - any suggestions?

                                1 Solution

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                                Hello Noxe,

                                As I noted in https://community.devexpress.com/blogs/xpo/archive/2019/07/30/xpo-net-core-3-0-support-in-winforms-and-wpf-apps-with-microsoft-net-sdk-windowsdesktop.aspx, there are some specificities that developers should take into account when they share .NET Standard 2.0 and .NET Core 3.0 Desktop libraries that depend on DevExpress APIs:

                                > More difficult code sharing if you create core libraries with the DevExpress.Data or DevExpress.Xpo assemblies. You may need to create 2 .csproj files: one for .NET Core 3.0 desktop apps and the other for .NET Standard 2.0 cross-platform apps.

                                Future solutions may include the following:

                                • Increase the minimally supported .NET version in DevExpress assemblies to 4.7.2. This way they will support .NET Standard 2.0 and can be used in .NET Core 3 apps with no problems.
                                • Refactor DevExpress.Data and other core libraries to have .NET Framework 4.5.2 and .NET Standard 2.0 versions. The latter can be used in .NET Core 3 apps with no problems.
                                 

                                More difficult solution in v19.1-2 is caused for the following reasons:

                                • Our assemblies are on .NET Framework 4.5.2 at the time of this writing.
                                • We cannot change the minimally supported .NET version too often due to existing customers and compatibility issues.
                                • The minimum .NET Framework version that supports .NET Standard 2.0 completely is 4.7.2 (https://docs.microsoft.com/en-us/dotnet/standard/net-standard).
                                • Refactoring these libraries to separate this platform-dependent code in new assemblies is also a serious change for thousands of customers and even a greater number of their existing apps.
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                                • Martin Praxmarer - DevExpress MVP 08.24.2019

                                  Thx Dennis - not quite the solution i had hoped for. currently thinking about postponing netcore3 tests.

                                  but i do not fully understand the problem yet. there are already netstandard DevExpress.Data / Xpo assemblies - so what exactly is the problem here?

                                • Dennis (DevExpress) 08.26.2019

                                  >there are already netstandard DevExpress.Data / Xpo assemblies - so what exactly is the problem here?

                                  The .NET Standard 2.0 version of DevExpress.Data is a stripped down version that is used primarily for XPO.

                                  This stripped down DevExpress.Data library does not contain code required for DevExpress WinForms and WPF components. For instance, take a look at the DevExpress.Data/Platform folder or look for the "DXPORTABLE" string inside the source code. I hope it is clearer now.

                                • Martin Praxmarer - DevExpress MVP 08.26.2019

                                  ok - thx Dennis, its clear now - but not really satisfying ;)

                                • Dennis (DevExpress) 08.26.2019

                                  Thanks for your feedback, Noxe - I think our teams will improve it when it becomes technically feasible for us and other customers. I am not a fan of the current behavior either. If you experience any other issues while sharing code as I suggested above, please let us know - thanks!

                                • Martin Praxmarer - DevExpress MVP 08.26.2019

                                  Thx Dennis - i think i will do some testing the next month in my sparetime - but i think it is not worth for anything in production this year - even when they release netcore 3. my fear with this approach currently is simply too much overhead for us...

                                • Dennis (DevExpress) 08.26.2019

                                  Got it, thanks!