ASP.NET 5 EntityFramework.Core 7.0.0-rc1-final issue - 編譯器想要引用7.0.0.0,但未找到

asp.net asp.net-core c# dnu entity-framework-core

我有同樣的問題。我在project.json文件中添加了以下依賴項:

"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"
  },
...

我用dnu install EntityFrameworkdnu install EntityFramework.SqlServer來安裝軟件包。 "EntityFramework": "7.0.0-beta4",由安裝程序本身自動編寫在dependencies節點下。

問題/問題1:令我驚訝的是,當我為EntityFramework提供智能時,我提供的可用版本僅為6.1.3

問題2:當我使用dnu build編譯我的應用程序時(我在dependencies節點下手動添加EntityFramework程序集( .Core.Commands )後運行了dnu restore命令)我收到了一堆編譯錯誤:

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?)

如果我刪除.Core.Commands程序集引用項目構建正常。

然後,我改變了版本EntityFramework.Core7.0.0.0中提到的錯誤:

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'.

dnu restore現在給了我以下內容:

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

我是asp.net 5 Visual Studio code平台的新手。我不能使用Visual Studio 2015因為開發團隊的其他成員正在使用OSX。

這對我來說是一個學習項目。要求非常簡單。連接SQL Server數據庫,使用Entity Framework提取master-child關係數據。

搞砸了!幫幫我!!

提前致謝

UPDATE

  1. 對於版本為7.0.0-rc1-final所有軟件包,我可以看到project.json的主要更改。我使用Yeoman生成器工具來創建項目,但看起來你通過Visual Studio更正了包。那麼,我是否必須手動更新軟件包版本並restore它們?

  2. 當項目由Yeoman創建/生成時,默認情況下沒有添加global.json文件。我可以手動添加並手動放入代碼嗎?這會有用嗎?

  3. 我還可以看到一些額外的包引用被添加到project.json文件中,默認情況下,Yeoman生成器沒有添加它們 - 如Microsoft.AspNet.Tooling.RazorMicrosoft.Extensions.Logging.ConsoleMicrosoft.Extensions.Logging.DebugMicrosoft.Extensions.Logging等它們是否都在項目中有效使用?因為生成器沒有自動添加它們,我是否可以手動添加它們並使用dnu restore ?如果我手動添加它會對項目產生任何影響嗎?

一般承認的答案

您應該從依賴項中刪除 "EntityFramework" (刪除"EntityFramework": "7.0.0-beta4" )並使用

"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
"EntityFramework.MicrosoftSqlServer.Design": "7.0.0-rc1-final",
"EntityFramework.Commands": "7.0.0-rc1-final"

只要。如果由於以下依賴項添加了"EntityFramework.Core": "7.0.0-rc1-final"則無需顯式添加"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final"

"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final":
    "EntityFramework.Relational": "7.0.0-rc1-final":
        "EntityFramework.Core": "7.0.0-rc1-final"

我的意思是EntityFramework.MicrosoftSqlServer需要EntityFramework.Relational ,它需要EntityFramework.Core

您還應驗證global.json包含"sdk": { "version": "1.0.0-rc1-update1" }

更新 :我檢查了你上傳的測試項目。它有很多小問題。我修改了它。您可以在此處下載修改後的項目。 不要忘記修復appsettings.json使用的ConnectionString ,它包含我在我用過的Server

最重要的變化是使用更簡單的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; }
    }
}

使用以下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(); 
            }
        }
    }    
}

project.json與以下dependencies部分的用法:

{
  "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": { }
  }
}

修復appsettings.json來自

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Verbose",
      "System": "Information",
      "Microsoft": "Information"
    },
    "Data": {
        "DefaultConnection":{
            "ConnectionString": "Server=localhost;Database=BookStore;User Id=sa; Password=******;Trusted_Connection=true;"
        }
    }
  }
}

{
  "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 不應該在Logging

以及以下Startup.cs的用法

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);
    }
}

我在Configure方法的註釋中寫道,應該執行命令

dnx ef migrations add Initial
dnx ef database update

恢復所有包後。 dnx ef migrations add Initial將在項目中使用20160101205609_Initial.csBookContextModelSnapshot.cs等文件創建其他Migrations文件夾。 appsettings.json定義的數據庫將由dnx ef database update創建,並且在與程序分叉期間將填充來自SampleData.cs測試數據。

順便說一句,我將package.json移動到包文件夾中(與project.json處於同一級別)。您不使用這些包,但該移動使得npm包在Visual Studio中可見和管理。




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許可下: CC-BY-SA with attribution
不隸屬於 Stack Overflow
這個KB合法嗎? 是的,了解原因