EntityTypeBuilder does not contain a definition for ToTable in EF Core

Question

I have this sample code:

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Models;

namespace MySampleNamespace
{         


        

Answer 1

Depending on your .Net version you are using. Microsoft.EntityFrameworkCore.Tools.DotNet only supports .NetStandard >= 2.0.

If your .Net version is 4.6.1, update Microsoft.EntityFrameworkCore to 2.0.0-preview1-final, along with related EntityFramework DLLs, then close Visual Studio 2017 and re-open.

Answer 2

Ensure that the correct project is selected in the "Default Project" dropdown, and then type the command below :

install-package microsoft.entityframeworkcore.sqlserver

Answer 3

Ivan & Mardoxx are correct.

I tried to just install Microsoft.EntityFrameworkCore.Tools then got this error:

Detected package downgrade: Microsoft.EntityFrameworkCore from 2.1.4 to 2.1.1. Reference the package directly from the project to select a different version. -> Microsoft.EntityFrameworkCore.Tools 2.1.4 -> Microsoft.EntityFrameworkCore.Design 2.1.4 -> Microsoft.EntityFrameworkCore.Relational 2.1.4 -> Microsoft.EntityFrameworkCore (>= 2.1.4) -> Microsoft.EntityFrameworkCore (>= 2.1.1)

1. I upgraded Microsoft.EntityFrameworkCore via nuget
2. I did install Microsoft.EntityFrameworkCore.Tools which didn't work for ToTable , unknown if this is even needed
3. I did then install the Microsoft.EntityFrameworkCore.Relational and it now resolves

Answer 4

Installing Microsoft.EntityFrameworkCore.Relational is the correct solution, as Ivan says.

Answer 5

You should add the nuget package Microsoft.EntityFrameworkCore.SqlServer, since this is a Microsoft SQL method.

Answer 6

For EFCore 3.1 I needed to use this in my DB context:

protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        foreach (IMutableEntityType entity in modelBuilder.Model.GetEntityTypes())
        {
            entity.SetTableName("WS_" + entity.GetTableName());
        }
    }

No additional Nuget package was required.