问题
I am having the same issue. I have added the following dependencies in my project.json
file:
"dependencies": {
"EntityFramework": "7.0.0-beta4",
"EntityFramework.Core": "7.0.0-rc1-final",
"EntityFramework.SqlServer": "7.0.0-beta8",
"EntityFramework.Commands": "7.0.0-rc1-final"
},
"commands": {
"web": "Microsoft.AspNet.Server.Kestrel",
"ef": "EntityFramework.Commands"
},
...
I used dnu install EntityFramework
and dnu install EntityFramework.SqlServer
to install the packages. "EntityFramework": "7.0.0-beta4",
was written under dependencies
node automatically by the installer itself.
Issue / Question 1: To my surprise when I was pulling in the intellisence for EntityFramework
the available version I am presenting with is only 6.1.3
!
Issue 2: When I am compiling my application using dnu build
(I ran dnu restore
command after adding EntityFramework
assemblies (.Core
and .Commands
) manually under dependencies
node I am getting a bunch of compilation errors:
The type 'DbContextOptionsBuilder' is defined in an assembly that is not referenced. You must add a reference to assembly 'EntityFramework.Core, Version=7.0.0.0, Culture=neutral, PublicKeyToken=null'.
D:\Projects\aspnet\apiservice\Models\SampleData.cs(12,41): DNXCore,Version=v5.0 error CS0308: The non-generic method 'IServiceProvider.GetService(Type)' cannot be used with type arguments
D:\Projects\aspnet\apiservice\Models\SampleData.cs(13,32): DNXCore,Version=v5.0 error CS0308: The non-generic method 'IServiceProvider.GetService(Type)' cannot be used with type arguments
D:\Projects\aspnet\apiservice\Models\SampleData.cs(14,29): DNXCore,Version=v5.0 error CS1061: 'object' does not contain a definition for 'Books' and no extension method 'Books' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
D:\Projects\aspnet\apiservice\Models\SampleData.cs(15,42): DNXCore,Version=v5.0 error CS1061: 'object' does not contain a definition for 'Authors' and no extension method 'Authors' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
D:\Projects\aspnet\apiservice\Models\SampleData.cs(17,43): DNXCore,Version=v5.0 error CS1061: 'object' does not contain a definition for 'Authors' and no extension method 'Authors' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
D:\Projects\aspnet\apiservice\Models\SampleData.cs(19,45): DNXCore,Version=v5.0 error CS1061: 'object' does not contain a definition for 'Authors' and no extension method 'Authors' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
D:\Projects\aspnet\apiservice\Models\SampleData.cs(22,29): DNXCore,Version=v5.0 error CS1061: 'object' does not contain a definition for 'Books' and no extension method 'Books' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
D:\Projects\aspnet\apiservice\Models\SampleData.cs(61,29): DNXCore,Version=v5.0 error CS1061: 'object' does not contain a definition for 'SaveChanges' and no extension method 'SaveChanges' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
If I remove .Core
and .Commands
assembly references the project build fine.
Then I changed the version for EntityFramework.Core
to 7.0.0.0
as mentioned in the error:
The type 'DbContextOptionsBuilder' is defined in an assembly that is not referenced. You must add a reference to assembly 'EntityFramework.Core, Version=7.0.0.0, Culture=neutral, PublicKeyToken=null'.
But dnu restore
now gave me the following:
Unable to locate Dependency EntityFramework.Core >= 7.0.0
Writing lock file D:\Projects\aspnet\apiservice\project.lock.json
Restore complete, 6675ms elapsed
Errors in D:\Projects\aspnet\apiservice\project.json
Unable to locate Dependency EntityFramework.Core >= 7.0.0
I am a newbie in asp.net 5
Visual Studio code
platform. And I cannot use Visual Studio 2015
as other members of the dev team are using OSX.
This is a learning project for me. Requirement is pretty straight forward. Connect a SQL Server database, pull master-child
relational data using Entity Framework.
Screwed up! Help!!
Thanks in advance
UPDATE
I can see the major changes in
project.json
for all packages with version7.0.0-rc1-final
. I used Yeoman generator tool to create the project but looks like you corrected the package throughVisual Studio
. So, do I have to update the package version manually andrestore
them?When the project was created/generated by Yeoman, there was no
global.json
file added by default. Can I add this manually and put the code inside by hand? Will this work?I can also see some additional package references are added to
project.json
file which were not added by default by Yeoman generator - likeMicrosoft.AspNet.Tooling.Razor
,Microsoft.Extensions.Logging.Console
,Microsoft.Extensions.Logging.Debug
,Microsoft.Extensions.Logging
etc. Are they all being used effectively in the project? Because the generator did not add them automatically, again, can I add them manually and restore usingdnu restore
? Will this have any impact on the project if I add them manually?
回答1:
You should remove "EntityFramework"
from dependencies (remove the line "EntityFramework": "7.0.0-beta4"
) and use
"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
"EntityFramework.MicrosoftSqlServer.Design": "7.0.0-rc1-final",
"EntityFramework.Commands": "7.0.0-rc1-final"
only. You don't need to add "EntityFramework.Core": "7.0.0-rc1-final"
explicitly if you added "EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final"
because of the following dependencies:
"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final":
"EntityFramework.Relational": "7.0.0-rc1-final":
"EntityFramework.Core": "7.0.0-rc1-final"
I mean that EntityFramework.MicrosoftSqlServer
requires EntityFramework.Relational
, which requires EntityFramework.Core
.
You should verify additionally that global.json
contains "sdk": { "version": "1.0.0-rc1-update1" }
.
UPDATED: I examined the test project which you uploaded. It had many small problems. I modified it. You can download the modified project here. Don't forget to fix the ConnectionString
used in appsettings.json
, it contains the Server
which I used at me.
The most important changes are the usage of more simple BookContext.cs
:
using Microsoft.Data.Entity;
namespace apiservice.Models {
public class BookContext : DbContext {
public DbSet<Author> Authors { get; set; }
public DbSet<Book> Books { get; set; }
}
}
the usage of the following SampleData.cs
using System;
using System.Linq;
using Microsoft.Data.Entity;
using Microsoft.Extensions.DependencyInjection;
namespace apiservice.Models
{
public static class SampleData
{
public static void Initialize(IServiceProvider serviceProvider) {
var context=serviceProvider.GetService<BookContext>();
context.Database.Migrate();
if (!context.Books.Any()) {
var austen = context.Authors.Add(
new Author { LastName = "Austen", FirstName = "Jane" }).Entity;
var dickens = context.Authors.Add(
new Author { LastName = "Dickens", FirstName = "Charles" }).Entity;
var cervantes = context.Authors.Add(
new Author { LastName = "Cervantes", FirstName = "Miguel" }).Entity;
context.Books.AddRange(
new Book {
Title = "Pride and Prejudice",
Year = 1813,
Author = austen,
Price = 9.99M,
Genre = "Comedy of manners"
},
new Book {
Title = "Northanger Abbey",
Year = 1817,
Author = austen,
Price = 12.95M,
Genre = "Gothic parody"
},
new Book {
Title = "David Copperfield",
Year = 1850,
Author = dickens,
Price = 15,
Genre = "Bildungsroman"
},
new Book {
Title = "Don Quixote",
Year = 1617,
Author = cervantes,
Price = 8.95M,
Genre = "Picaresque"
}
);
context.SaveChanges();
}
}
}
}
the usage of project.json
with the following dependencies
part:
{
"dependencies": {
"Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
"Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
"Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
"Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
"Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
"Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
"Microsoft.AspNet.Tooling.Razor": "1.0.0-rc1-final",
"Microsoft.Extensions.Configuration.FileProviderExtensions": "1.0.0-rc1-final",
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging.Debug": "1.0.0-rc1-final",
"Microsoft.Extensions.DependencyInjection": "1.0.0-rc1-final",
"Microsoft.Extensions.CodeGenerators.Mvc": "1.0.0-rc1-final",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc1-final",
"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
"EntityFramework.MicrosoftSqlServer.Design": "7.0.0-rc1-final",
"EntityFramework.Commands": "7.0.0-rc1-final",
"System.Net.Http": "4.0.1-beta-23516",
"Microsoft.Net.Http": "2.2.29",
"Newtonsoft.Json": "8.0.1"
},
"commands": {
"web": "Microsoft.AspNet.Server.Kestrel",
"ef": "EntityFramework.Commands"
},
"frameworks": {
"dnx451": { },
"dnxcore50": { }
}
}
fixing of appsettings.json
from
{
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Verbose",
"System": "Information",
"Microsoft": "Information"
},
"Data": {
"DefaultConnection":{
"ConnectionString": "Server=localhost;Database=BookStore;User Id=sa; Password=******;Trusted_Connection=true;"
}
}
}
}
to
{
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Verbose",
"System": "Information",
"Microsoft": "Information"
}
},
"Data": {
"DefaultConnection": {
"ConnectionString": "Server=localhost;Database=BookStore;User Id=sa; Password=******;Trusted_Connection=true;"
}
}
}
(Data
should not be under Logging
)
and the usage of the following Startup.cs
using apiservice.Models;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Data.Entity;
namespace apiservice
{
public class Startup
{
public static IConfigurationRoot Configuration {get; set;}
public Startup(IHostingEnvironment env)
{
// Set up configuration sources.
var builder = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddEntityFramework()
.AddSqlServer()
.AddDbContext<BookContext>(options =>
options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"])
);
services.AddMvc();
}
public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
// we need to execute the following two commands before
// dnu restore
// dnx ef migrations add Initial
// dnx ef database update
// For more details on creating database during deployment see http://go.microsoft.com/fwlink/?LinkID=615859
try
{
using (var serviceScope = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>()
.CreateScope())
{
serviceScope.ServiceProvider.GetService<BookContext>()
.Database.Migrate();
}
}
catch { }
app.UseIISPlatformHandler();
app.UseStaticFiles();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
SampleData.Initialize(app.ApplicationServices);
}
// Entry point for the application.
public static void Main(string[] args) => WebApplication.Run<Startup>(args);
}
}
I wrote in the comment inside of Configure
method that one should execute the commands
dnx ef migrations add Initial
dnx ef database update
after all packages are restored. dnx ef migrations add Initial
will create additional Migrations
folder in the project with the files like 20160101205609_Initial.cs
and BookContextModelSnapshot.cs
. The database defined in appsettings.json
will be created by dnx ef database update
and it will be filled with test data from SampleData.cs
during forking with the program.
By the way I moved package.json
inside of the package folder (on the same level as project.json
). You use the packages not, but the movement makes the npm packages visible and management in Visual Studio.
来源:https://stackoverflow.com/questions/34556542/asp-net-5-entityframework-core-7-0-0-rc1-final-issue-compiler-wants-7-0-0-0-to