我正在尝试使用C#在VS 2015 Pro(Update 3)中创建Web API并以.NET Core为目标.

无论如何,在教程中,我必须“使用依赖注入注册我的上下文” – 所以我必须将以下行添加到Startup.cs文件的ConfigureServices部分：

var connection = Configuration.GetConnectionString("DefaultConnection");

services.AddDbContext< Models.PropWorxContext > (options => options.UseSqlServer(connection));;

但是,VS给了我以下错误：

错误CS1061’DbContextOptionsBuilder’不包含’UseSqlServer’的定义,并且没有可以找到接受类型’DbContextOptionsBuilder’的第一个参数的扩展方法’UseSqlServer'(您是否缺少using指令或程序集引用？)

有什么想法吗？

这就是整个Startup.cs文件的样子：

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Logging;

namespace PropWorxAPI

{

public class Startup

{

public Startup(IHostingEnvironment env)

{

var builder = new ConfigurationBuilder()

.SetBasePath(env.ContentRootPath)

.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)

.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)

.AddEnvironmentVariables();

Configuration = builder.Build();

}

public IConfigurationRoot Configuration { get; }

// 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.AddMvc();

var connection = Configuration.GetConnectionString("DefaultConnection");

services.AddDbContext< Models.PropWorxContext > (options => options.UseSqlServer(connection));

}

// 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(Configuration.GetSection("Logging"));

loggerFactory.AddDebug();

app.UseMvc();

}

}

}

我还使用包管理器添加了MySQL包,因此我的project.json文件包含以下条目：

*"MySql.Data.EntityFrameworkCore": "7.0.6-IR31"*

任何关于我出错的提示都会非常感激,因为我花了一整天时间试图解决这个问题:(谢谢……