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Entity Framework Core et Entity Framework 6 sont tous les deux installés

ayi

J’utilise Visual Studio 2017 et je crée un nouveau projet <a href="http://ASP.NET" rel="noopener nofollow ugc">ASP.NET</a> Core. 
J’ajoute une migration pour Entity Framework Core comme ci-dessous
<pre><code class="lang-auto">add-migration "Initial Create"

</code></pre>
et j’obtiens l’erreur suivante :
<pre><code class="lang-auto">Both Entity Framework Core and Entity Framework 6 are installed. The Entity Framework Core tools are running. Use 'EntityFramework\Add-Migration' for Entity Framework 6.
Build Failed.

</code></pre>
Savez-vous comment résoudre cette erreur ?
<h2><a name="p-38329-mise-jour-1-14-mars-2017-rsultat-obtenu-aprs-lexcution-de-la-commande-1" class="anchor" href="#p-38329-mise-jour-1-14-mars-2017-rsultat-obtenu-aprs-lexcution-de-la-commande-1" aria-label="Heading link"></a>MISE À JOUR 1 - 14 mars 2017 - Résultat obtenu après l’exécution de la commande</h2>
<pre><code class="lang-auto">PM> dotnet ef migrations add "Initial Create"

</code></pre>
Je vois la sortie suivante avec un message d’erreur à la fin.

<pre><code class="lang-auto">Welcome to .NET Core!

Learn more about .NET Core @ https://aka.ms/dotnet-docs. Use dotnet --help to see available commands or go to https://aka.ms/dotnet-cli-docs.

Telemetry

The .NET Core tools collect usage data in order to improve your experience. The data is anonymous and does not include command-line arguments. The
data is collected by Microsoft and shared with the community.
You can opt out of telemetry by setting a DOTNET_CLI_TELEMETRY_OPTOUT environment variable to 1 using your favorite shell.
You can read more about .NET Core tools telemetry @ https://aka.ms/dotnet-cli-telemetry.

Configuring...

A command is running to initially populate your local package cache, to improve restore speed and enable offline access. This command will take up
to a minute to complete and will only happen once.
Decompressing 0%Decompressing 1%Decompressing 2%Decompressing 3%Decompressing 4%
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mpressing 9%Decompressing 10%Decompressing 11%Decompressing 12%Decompressing 13
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compressing 95%Decompressing 96%Decompressing 97%Decompressing 98%Decompressin
g 99%Decompressing 100% 5083 ms
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panding 6%Expanding 7%Expanding 8%Expanding 9%Expanding 10%Expanding 11%
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panding 40%Expanding 41%Expanding 42%Expanding 43%Expanding 44%Expanding 45%
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g 51%Expanding 52%Expanding 53%Expanding 54%Expanding 55%Expanding 56%
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nding 68%Expanding 69%Expanding 70%Expanding 71%Expanding 72%Expanding 73%
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ing 96%Expanding 97%Expanding 98%Expanding 99%Expanding 100% 13884 ms

dotnet : No executable found matching command "dotnet-ef"
At line:1 char:1

dotnet ef migrations add "Initial Create"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (No executable f...and "dotnet-ef":String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError

</code></pre>
<h2><a name="p-38329-mise-jour-2-14-mars-2017-startupcs-2" class="anchor" href="#p-38329-mise-jour-2-14-mars-2017-startupcs-2" aria-label="Heading link"></a>MISE À JOUR 2 - 14 mars 2017 - Startup.cs</h2>
<pre><code class="lang-auto">using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Configuration;
using OdeToFood.Services;
using OdeToFood.Entities;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;

namespace OdeToFood
{
public class Startup
{
public IConfiguration Configuration { get; set; }

public Startup(IHostingEnvironment env)
{
// TN - Read setting files
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json")
.AddEnvironmentVariables();

Configuration = builder.Build();
}

// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
services.AddSingleton(Configuration);
services.AddSingleton<IGreeter, Greeter>();
services.AddScoped<IRestaurantData, SqlRestaurantData>(); // TN - One instance of this service for each HTTP request.
services.AddDbContext<OdeToFoodDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
services.AddIdentity<User, IdentityRole>()
.AddEntityFrameworkStores<OdeToFoodDbContext>();
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole();

if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
//app.UseExceptionHandler("/error");
//app.UseExceptionHandler(new ExceptionHandlerOptions { ExceptionHandlingPath="/error" });

app.UseExceptionHandler(new ExceptionHandlerOptions
{
ExceptionHandler = context => context.Response.WriteAsync("Opps!")
});
}

//app.UseDefaultFiles();// TN - will pick index.html
//app.UseStaticFiles();

app.UseFileServer(); // TN - This will include UseDefaultFiles() and UseStaticFiles

/*
app.UseWelcomePage(new WelcomePageOptions
{
Path = "/welcome"
});

app.Run(async (context) =>
{
// TN - Read directly from configuration file
//var message = Configuration["Greeting"];

// TN - Dependency Injection - Read from configuration string via IOC
var message = greeter.GetGreeting();
await context.Response.WriteAsync(message);
});
*/

app.UseIdentity();

//app.UseMvcWithDefaultRoute();
app.UseMvc(ConfigureRoutes);

// TN - if no route matches
app.Run(ctx => ctx.Response.WriteAsync("Not found."));
}

private void ConfigureRoutes(IRouteBuilder routeBuilder)
{
//Home/Index
routeBuilder.MapRoute("Default",
"{controller=Home}/{action=Index}/{id?}");
}
}
}

</code></pre>
Mise à jour 3 - 14 mars 2017 - Fichier csproj ajouté
<pre><code class="lang-auto"><Project Sdk="Microsoft.NET.Sdk.Web">

<PropertyGroup Label="Globals">
<SccProjectName>SAK</SccProjectName>
<SccProvider>SAK</SccProvider>
<SccAuxPath>SAK</SccAuxPath>
<SccLocalPath>SAK</SccLocalPath>
</PropertyGroup>

<PropertyGroup>
<TargetFramework>netcoreapp1.1</TargetFramework>
<PackageTargetFallback>portable-net45+win8</PackageTargetFallback>
</PropertyGroup>

<ItemGroup>

<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.0" />
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.0.0" />
<PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
<PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />
<PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.0" />
<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.1" />
<PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.1.0" />
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.0" />
</ItemGroup>
<ItemGroup>
<Folder Include="Controllers\" />
<Folder Include="Data\" />
<Folder Include="Views\Home\" />
<Folder Include="wwwroot\images\" />
</ItemGroup>

</Project>

</code></pre>
<hr>
Source : <a href="https://aka.ms/dotnet-docs." rel="noopener nofollow ugc">Stack Overflow</a>

ayi_2

Comment j’ai résolu cela dans VS 2017|2019
<ul>
<li>
Supprimez les références EntityFramework (pas EntityFrameworkCore) de tous les projets de la solution
</li>
<li>
Ouvrez le dossier de la solution dans l’Explorateur (Explorateur Windows)
</li>
<li>
Fermez VS
</li>
<li>
Supprimez le dossier .vs
</li>
<li>
Rouvrez la solution
</li>
<li>
Exécutez <code>update-database</code> et l’alerte a disparu
</li>
</ul>
Vous ne pouvez pas voir le dossier ‘.vs’ ?