Could not load file or assembly 'Microsoft.Ent

I have a Asp.Net Core project targeting .NET 462 and it was working with Asp.Net Core version 1.0.1. After upgrading to "1.1.0" I got this error:

FileLoadException: Could not load file or assembly 'Microsoft.EntityFrameworkCore.SqlServer, 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)

project.json

"dependencies": {
    "AspNet.Mvc.TypedRouting": "1.2.0",
    "AutoMapper": "5.1.1",
    "AutoMapper.Extensions.Microsoft.DependencyInjection": "1.1.2",
    "BundlerMinifier.Core": "2.2.306",
    "JetBrains.Annotations": "10.2.1",
    "libphonenumber-csharp": "7.7.4",
    "Microsoft.AspNetCore.Authentication.Cookies": "1.1.0",
    "Microsoft.AspNetCore.Authentication.Facebook": "1.1.0",
    "Microsoft.AspNetCore.Authentication.Google": "1.1.0",
    "Microsoft.AspNetCore.Authentication.MicrosoftAccount": "1.1.0",
    "Microsoft.AspNetCore.Authentication.OpenIdConnect": "1.1.0",
    "Microsoft.AspNetCore.Authentication.Twitter": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Mvc": "1.1.0",
    "Microsoft.AspNetCore.Razor.Tools": "1.1.0-preview4-final",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel.Https": "1.1.0",
    "Microsoft.AspNetCore.Session": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.EntityFrameworkCore": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
    "Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final",
    "Microsoft.Extensions.Configuration": "1.1.0",
    "Microsoft.Extensions.Configuration.Abstractions": "1.1.0",
    "Microsoft.Extensions.Configuration.CommandLine": "1.1.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.1.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.0",
    "Microsoft.VisualStudio.Web.CodeGenerators.Mvc": "1.1.0-preview4-final",
    "MotleyFlash": "0.3.0",
    "MotleyFlash.AspNetCore.MessageProviders": "0.2.0",
    "MotleyFlash.AspNetCore.ViewHelpers": "0.2.0",
    "SendGrid.NetCore": "1.0.0-rtm-00002",
    "System.Interactive.Async": "3.1.0",
    "Twilio": "4.7.2"
},
"frameworks": {
    "net462": {
        "dependencies": {
            "TaxiGun.Server.IdentityServer.Data": {
                "target": "project"
            },
            "TaxiGun.Server.Services": {
                "target": "project"
            }
        }
    }
},

When I take a look at on build output folder, I can see all the libraries in a proper version except "Microsoft.EntityFrameworkCore.SqlServer":

I think it is causing the problem. But I just can not figure out why the version is wrong? Is it because the nuget package has a wrong version inside?

回答1:

Complete project references clean-up solved my problem.

Delete all bin/obj folders
Delete all project.lock.json files
Delete local Nuget repository cache (computer one)
Remove all references from project.json file and add only required ones (with the help of R#)
nuget udpate, dotnet restore = project is running

When I'm thinking about it again, maybe only point 4 was important?

回答2:

updated Pomelo.EntityFrameworkCore.MySql in .csproj file to the latest version 3.1.1 to fix issue.