MissingMethodException: LinqToDB.DataProvider.Oracle.OracleTools.GetDataProvider()

[jkrajcir]

Nuget packages being used:

• linq2db.EntityFrameworkCore v6.11.0
• linq2db v5.0.0-preview.2 (utilizing C# nullable reference type support) Database being used is SQL Server.

I am running the following code: LinqToDBForEFTools.Initialize(); await using IDbContextTransaction transaction = await DbContext.Database.BeginTransactionAsync(); using IDataContext linqToDbContext = DbContext.CreateLinqToDbContext(transaction);

Calling DbContext.CreateLinqToDbContext(transaction) throws the following exception: Unhandled exception. System.MissingMethodException: Method not found: 'LinqToDB.DataProvider.IDataProvider LinqToDB.DataProvider.Oracle.OracleTools.GetDataProvider(LinqToDB.DataProvider.Oracle.OracleVersion, LinqToDB.DataProvider.Oracle.OracleProvider)'. at LinqToDB.EntityFrameworkCore.LinqToDBForEFToolsImplDefault.CreateLinqToDbDataProvider(EFProviderInfo providerInfo, LinqToDBProviderInfo provInfo, EFConnectionInfo connectionInfo) at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory) at LinqToDB.EntityFrameworkCore.LinqToDBForEFTools.GetDataProvider(EFProviderInfo info, EFConnectionInfo connectionInfo) at LinqToDB.EntityFrameworkCore.LinqToDBForEFTools.CreateLinqToDbContext(DbContext context, IDbContextTransaction transaction)

Using linq2db v4.4.1 works fine and doesn't throw this exception.

Looks like ProviderName is getting set to one of the Oracle ones somehow, which calls the wrong method here

[jkrajcir]

I downloaded the v6.11.0 code to see what is going on in with the debugger, and it looks like ProviderName is getting correctly set to "SqlServer". CreateLinqToDbDataProvider() is where the exception is getting thrown. The debugger won't let me step in further, and won't hit a breakpoint set inside the method.

[jkrajcir]

Changed linq2db back to 4.4.1 and was able to use linqToDbContext.GetFluentMappingBuilder() to configure the mapping of the nullable property that was giving me problems.

This issue can be closed since I ultimately fixed the problem I was running into. I suspect #293 will probably fix this anyways.

Thank you for this useful library!

[sdanyliv]

Yes, you cannot use version 5.0 preview with this extension. It is just incompatible yet.

[MaceWindu]

linq2db 5.0.0 support released