System.Private.CoreLib.ni中发生了“ System.MissingMethodException”

Question

I am working on a project (Visual Studio 2015 update 3) where I am using Entity framework core with MySQL. I am able to write to data to my database, but when trying to query data using DbSet<T>.Find(...) or FirstOrDefault I get this exception:

An exception of type 'System.MissingMethodException' occurred in System.Private.CoreLib.ni.dll but was not handled in user code

Additional information: Method not found: 'Void Microsoft.EntityFrameworkCore.Query.QueryContextFactory..ctor(Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IStateManager, Microsoft.EntityFrameworkCore.Internal.IConcurrencyDetector, Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IChangeDetector)'

I tried to update all the packages from NuGet packages manager, with no success. This question may apear like semi duplicate, but it is NOT, no solution worked for me. Any ideas? Thanks in advance!

Answer 1

OK it seems to be a bug in MySQL -> entity framework adapter MySql.Data.EntityFrameworkCore . I downgraded from 7.0.6-IR31 to 6.10.1-beta and everything works fine now!

Answer 2

Just in case someone finds this issue. In Enterprise edition, this issue is not there as of now. This bug is still open in community edition. It doesn't support all ef core frameworks versions as of now. Please refer following referenced links for supported versions.

Following is the reported issue. https://bugs.mysql.com/bug.php?id=89855

Following is the version support table. https://dev.mysql.com/doc/connector-net/en/connector-net-entityframework-core.html