Don't use reflection at runtime

[AndriySvyryd]

This is a grouping of related issues. Feel free to vote (👍) for this issue to indicate that this is an area that you think we should spend time on, but consider also voting for individual issues for things you consider especially important.

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The code that currently uses reflection and expression compilation at runtime can be precompiled:

• Compiled model: Use static binding instead of reflection for properties and fields #24900
• Precompiled queries #25009
• Compiled model: Generate lambdas used in change tracking #24904
• Move detection of ColumnAttribute in RelationalTypeMappingInfo to conventions #11124
• Remove MakeGenericMethod from the query hot path #27437

This would allow to remove all reflection data from the compiled model (e.g. IReadOnlyTypeBase.ClrType, IReadOnlyPropertyBase.PropertyInfo) and significantly improve AOT experience.

[Noemata]

@AndriySvyryd , totally agree. I'd be interesting in helping with this if there was a commitment to support UWP from the get go.

[hez2010]

efcore is using assembly loading which is incompatible with NativeAOT:

efcore/src/Microsoft.Data.Sqlite.Core/Utilities/BundleInitializer.cs

Line 20 in b3619b4

assembly = Assembly.Load(new AssemblyName("SQLitePCLRaw.batteries_v2"));

Though it can be mitigated by calling SQLitePCL.Batteries_V2.Init() manually before efcore context setup (thanks to the try-catch block).