Breaking changes to relational command methods may affect Npgsql provider

[divega]

Steps to reproduce

1. Create a .NET Framework console app

2. Execute install-package Microsoft.EntityframeworkCore.Relational -pre form a feed with recent 1.1.0 preview1 bits

3. Execute install-package Npgsql.EntityFrameworkCore.PostgreSQL from the NuGet feed.

4. Add some code that uses the Npgsql provider and build, e.g.:

   using Microsoft.EntityFrameworkCore;
   
   namespace ConsoleApplication86
   {
   class Program
   {
       static void Main(string[] args)
       {
   
       }
   }
   
   public class MyContext: DbContext
   {
       protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
       {
           optionsBuilder.UseNpgsql("");
       }
   }
   }

5. go to the bin\debug or release folder in a developer command prompt and execute ngen install ConsoleApplication86.exe

The issue

The relevant output looks like this:

Warning: System.MissingMethodException: Method not found: 'System.Object Microsoft.EntityFrameworkCore.Storage.IRelationalCommand.ExecuteScalar(Microsoft.EntityFrameworkCore.Storage.IRelationalConnection, System.Collections.Generic.IReadOnlyDictionary`2<System.String,System.Object>, Boolean)'. while resolving 0xa0000a8 - Microsoft.EntityFrameworkCore.Storage.IRelationalCommand.ExecuteScalar.
Warning: System.MissingMethodException: Method not found: 'System.Threading.Tasks.Task`1<System.Object> Microsoft.EntityFrameworkCore.Storage.IRelationalCommand.ExecuteScalarAsync(Microsoft.EntityFrameworkCore.Storage.IRelationalConnection, System.Collections.Generic.IReadOnlyDictionary`2<System.String,System.Object>, Boolean, System.Threading.CancellationToken)'. while resolving 0xa0001da - Microsoft.EntityFrameworkCore.Storage.IRelationalCommand.ExecuteScalarAsync.
Method not found: 'System.Object Microsoft.EntityFrameworkCore.Storage.IRelationalCommand.ExecuteScalar(Microsoft.EntityFrameworkCore.Storage.IRelationalConnection, System.Collections.Generic.IReadOnlyDictionary`2<System.String,System.Object>, Boolean)'. while compiling method NpgsqlDatabaseCreator.HasTables
Method not found: 'System.Threading.Tasks.Task`1<System.Object> Microsoft.EntityFrameworkCore.Storage.IRelationalCommand.ExecuteScalarAsync(Microsoft.EntityFrameworkCore.Storage.IRelationalConnection, System.Collections.Generic.IReadOnlyDictionary`2<System.String,System.Object>, Boolean, System.Threading.CancellationToken)'. while compiling method <HasTablesAsync>d__8.MoveNext

These methods were removed in dbdfe14.

The output is the same for .NET Framework 4.5.1 and 4.6 but I don't know how to do something similar for .NET Core.

Further technical details

EF Core version: 1.1.0-alpha1-22431
Npgsql.EntityFrameworkCore.PostgreSQL version: 1.0.2
Operating system: Windows 10
Visual Studio version: VS 2015 Update 3

[AndriySvyryd]

Fixed in cbc617e