Steps to reproduce:1. Create a new asp net core web application , and select api template on next stage.
2. Save project once created and then add DevExpress.xpo nuget package to project, save and build.
3. Add new data model fill out wizard to create a new database. Save.
ConnectionHelper.cs, JsonSerializationContractResolver.cs and ServiceCollectionExtensions.cs all lack the necessary dx using statements to compile.
Any time you add to the model and save these are regenerated minus the using statements.
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