ASP.NET Core 1 and Entity Framework (Npgsql) breaks Startup class and says: app.UseMvc method not available

Question

I want to use the Entity Framework 7 in my ASP.NET Core 1 application to connect to a PostgreSQL database.

If I add EntityFramework.Commands (7.0.0-beta5) and EntityFramework7.Npgsql (3.1.0-rc1-3) to my project.json file:

{
  "webroot": "wwwroot",
  "version": "1.0.0-*",

  "dependencies": {

    "Microsoft.AspNet.Mvc": "6.0.0-beta5",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta5",
    "Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta5",
    "Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta5",
    "Microsoft.AspNet.Authentication.Google": "1.0.0-beta5",
    "Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta5",
    "Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta5",
    "Microsoft.AspNet.Diagnostics": "1.0.0-beta5",
    "Microsoft.AspNet.Server.IIS": "1.0.0-beta5",
    "Microsoft.AspNet.Server.WebListener": "1.0.0-beta5",
    "Microsoft.AspNet.StaticFiles": "1.0.0-beta5",
    "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta5",
    "Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta5",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta5",
    "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta5",
    "Microsoft.Framework.Logging": "1.0.0-beta5",
    "Microsoft.Framework.Logging.Console": "1.0.0-beta5",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta5",

    "EntityFramework.Commands": "7.0.0-beta5",
    "EntityFramework7.Npgsql": "3.1.0-rc1-3"
  },

  "commands": {
    "web": "Microsoft.AspNet.Hosting --config hosting.ini",
    "ef": "EntityFramework.Commands"
  },

  "frameworks": {
    "dnx451": { },
    "dnxcore50": { }
  },

  "publishExclude": [
    "node_modules",
    "bower_components",
    "**.xproj",
    "**.user",
    "**.vspscc"
  ],
  "exclude": [
    "wwwroot",
    "node_modules",
    "bower_components"
  ]
}

I get errors in my Startup.cs

using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Diagnostics;
using Microsoft.AspNet.Hosting;
using Microsoft.Framework.Configuration;
using Microsoft.Framework.DependencyInjection;
using Microsoft.Framework.Logging;

namespace Suplim.Web.Platform
{
    public class Startup
    {
        public IConfiguration Configuration { get; set; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.MinimumLevel = LogLevel.Information;
            loggerFactory.AddConsole();

            if (env.IsDevelopment())
            {
                app.UseBrowserLink();
                app.UseErrorPage(ErrorPageOptions.ShowAll);
            }
            else
            {
                app.UseErrorHandler("/Home/Error");
            }

            app.UseStaticFiles();


            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}

Then Visual Studio says that in my Startup.Configure() method it can not find the methods:

app.UseBrowserLink
app.UseErrorPage
app.UseErrorHandler
app.UseStaticFiles
app.UseMvc

It says

Core DNX 4.5.1 not available
Core DNX Core 5 available

But both packages are loaded and available in the Visual Studio references structure (DNX 4.5.1 and DNX Core 5).

If I remove the EntityFramework.Commands and EntityFramework7.Npgsql packages everything works fine.

Why does the Entity Framework affect my Startup class? Are the versions incompatible (beta5 and rc1-final)? If yes what can I do?

I do not understand the problem.

Pawel · Accepted Answer · 2016-03-16 18:59:27Z

3

You are using an rc1 package for EF and beta5 for anything else. You can't mix package versions. Move everything to rc1 (beta5 is a thing of the past) and use the rc1 runtime (dnx) otherwise things will break.

answered Mar 16, 2016 at 18:59

Pawel

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Comments

maz258 · Accepted Answer · 2016-03-16 19:18:58Z

0

I have already tried to set the same version to all packages but some packages are still beta-* and others are rc1-final. These are the newest packages (I removed the EntityFramework7.Npgsql and other not needed packages for testing):

  "dependencies": {
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
    "Microsoft.AspNet.Server.IIS": "1.0.0-beta7",
    "Microsoft.AspNet.Server.WebListener": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.AspNet.Tooling.Razor": "1.0.0-rc1-final",
    "Microsoft.Framework.Logging": "1.0.0-beta8",
    "Microsoft.Framework.Logging.Console": "1.0.0-beta8",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc1-final",

    "EntityFramework.Commands": "7.0.0-rc1-final"
  },

And my global.json is now:

{
  "projects": [ "src", "test" ],
  "sdk": {
    "version": "1.0.0-rc1-final",
    "runtime": "clr",
    "architecture": "x86"
  }
}

Now it can not find the EntityFramework.Commands and Microsoft.AspNet.Mvc packages (both with different version number than 1.0.0) in the DNX 4.5.1 reference. In the DNX Core 5 reference it finds nothing, all packages are unresolved.

It is like the old DLL hell ...

answered Mar 16, 2016 at 19:18

maz258

213 bronze badges

5 Comments

Behnam Esmaili Over a year ago

this is not the way of updating u'r question, move it to original post with Edit - Remark title.

RickJames Over a year ago

Also, the logging dlls are in rc1-final. You may be pointing to the wrong nuget feed. I would work on getting everything on the same version first then worry about errors.

RickJames Over a year ago

Have you checked your nuget feeds? Make sure you have this one I believe. myget.org/F/aspnetmaster

maz258 Over a year ago

@RickJames I am going to try the aspnetmaster repo tomorrow, thank you. I hope it will solve some problems.

Tseng Over a year ago

@maz258: Don't post updates or comments as answers. StackOverflow is not a form, its a Q/A site.

RickJames · Accepted Answer · 2016-03-16 19:23:37Z

0

"Microsoft.AspNet.Server.IIS": "1.0.0-beta7"

needs to be changed to

"Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final"

As the other responder says you are mixing and matching. You should have everything on the same version or don't use it.

answered Mar 16, 2016 at 19:23

RickJames

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3 Comments

maz258 Over a year ago

Ok, but what is with the Mvc? It is version 6.0.0-rc1-final and is not resolved. Also EntityFramework.Commands and EntityFramework7.Npgsql are in different versions than 1.0.0-rc1-final. I am not able to use them in a 1.0.0-rc1-final? And why nothing is resolved in the DNX Core 5 references? Sorry but it is very confusing, it was much easier in classic ASP.NET MVC 5.

maz258 Over a year ago

I know it is still beta but it is very confusing ;-)

RickJames Over a year ago

I agree it can be confusing. Hence though why it is beta. Everything has changed with each version of beta. So namespaces have changed etc and that adds to the confusion. It is the price we pay for using cutting edge.

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