Like the Xml Serializer Generator (sgen.exe) on desktop, Microsoft.XmlSerializer.Generator NuGet package is the solution for .NET Core and .NET Standard Libraries. It creates an Xml serialization assembly for types contained in an assembly to improve the startup performance of Xml serialization when serializing or de-serializing objects of those types using XmlSerializer.
The following is required for Microsoft.XmlSerializer.Generator to work. You can use command `dotnet --info` to check which versions of .NET Core SDK and runtime you may already have installed.
1. Build the application by running `dotnet build`. If everything succeeds, an assembly named MyApp.XmlSerializers.dll will be generated in the output folder. You will see warnings in the build output if the tool failed to generate the assembly.