Entity Framework Core Migrations – Assembly Version Mismatch

If you have switched your .NET Core project from xproj to csproj (MSBuild) and updated the nuget packages then you may run into an issue when executing some of the dotnet ef-commands.

In this article:

pg
Pawel Gerr is architect consultant at Thinktecture. He focuses on backends with .NET Core and knows Entity Framework inside out.
I got the following error after executing dotnet ef migrations list:
				
					Could not load file or assembly 'Microsoft.EntityFrameworkCore, Version=1.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

				
			

The problem is that some of my (3rd party) dependencies are using version 1.1.0 and the others version 1.1.1. In a classic .NET 4.6 project we use assembly redirects to solve this kind of problems and the in .NET Core we do the same …

Just create an app.config file with the following content:

				
					<?xml version="1.0" encoding="utf-8"?>

<configuration>
    <runtime>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
            <dependentAssembly>
                <assemblyIdentity name="Microsoft.EntityFrameworkCore" culture="neutral" publicKeyToken="adb9793829ddae60" />
                <bindingRedirect oldVersion="0.0.0.0-1.1.1.0" newVersion="1.1.1.0" />"
            </dependentAssembly>
            <dependentAssembly>
                <assemblyIdentity name="Microsoft.EntityFrameworkCore.Relational" culture="neutral" publicKeyToken="adb9793829ddae60" />
                <bindingRedirect oldVersion="0.0.0.0-1.1.1.0" newVersion="1.1.1.0" />"
            </dependentAssembly>
            <dependentAssembly>
                <assemblyIdentity name="Microsoft.Extensions.Logging.Abstractions" culture="neutral" publicKeyToken="adb9793829ddae60" />
                <bindingRedirect oldVersion="0.0.0.0-1.1.1.0" newVersion="1.1.1.0" />"
            </dependentAssembly>
        </assemblyBinding>
    </runtime>
</configuration>
				
			

If you still getting errors than make sure you have the following items in your csproj-file

				
					<ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.0">
        <PrivateAssets>All</PrivateAssets>
    </PackageReference>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0" />
</ItemGroup>
				
			
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