database - 数据库设置上的 asp.net-core 迁移错误

Question

我正在尝试先将代码与 asp.net core api 一起使用。执行时Add-Migration MyFirstMigration我收到错误

System.InvalidOperationException: Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions'1[Microsoft.EntityFrameworkCore.DbContext]' while attempting to activate 'DAL.DataBaseContext'. at Microsoft.Extensions.DependencyInjection.ServiceLookup.Service.PopulateCallSites(ServiceProvider provider, ISet'1 callSiteChain, ParameterInfo[] parameters, Boolean throwIfCallSiteNotFound) at
Microsoft.Extensions.DependencyInjection.ServiceLookup.Service.CreateCallSite(ServiceProvider provider, ISet'1 callSiteChain) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetResolveCallSite(IService service, ISet'1 callSiteChain) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetServiceCallSite(Type serviceType, ISet '1 callSiteChain) at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(Type serviceType, ServiceProvider serviceProvider) at System.Collections.Concurrent.ConcurrentDictionaryExtensions.GetOrAdd[TKey,TValue,TArg](ConcurrentDictionary'2 dictionary, TKey key, Func'3 valueFactory, TArg arg) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
at Microsoft.EntityFrameworkCore.Design.DbContextOperations.<>c__DisplayClass13_2.<FindContextTypes>b__6() at Microsoft.EntityFrameworkCore.Design.DbContextOperations.CreateContext(Func'1 factory) at Microsoft.EntityFrameworkCore.Design.DbContextOperations.CreateContext(String contextType) at Microsoft.EntityFrameworkCore.Design.MigrationsOperations.AddMigration(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Tools.Cli.MigrationsAddCommand.Execute(CommonOptions commonOptions, String name, String outputDir, String context, String environment, Action'1 reporter)
at Microsoft.EntityFrameworkCore.Tools.Cli.MigrationsAddCommand.<>c__DisplayClass0_0.<Configure>b__0() at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
at Microsoft.EntityFrameworkCore.Tools.Cli.Program.Main(String[] args)
Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions'1[Microsoft.EntityFrameworkCore.DbContext]' while attempting to activate 'DAL.DataBaseContext'.

我的 DatabaseContext 类看起来像

public class DataBaseContext: DbContext, IDbContext
{
    public DataBaseContext(DbContextOptions<DbContext> options) : base(options)
    {
    }

    public DbSet<Location> Locations { get; set; }
    public DbSet<Product> Products { get; set; }
    public DbSet<Category> Categories { get; set; }
    public DbSet<Event> Events { get; set; }
    public DbSet<ExistingProduct> ExisitingProducts { get; set; }
}  

像配置服务

public void ConfigureServices(IServiceCollection services)
        {
            //Add framework services.
            var connection = @"Server=(LocalDb)\\v11.0;Database=Home;Trusted_Connection=True;MultipleActiveResultSets=true";
            services.AddDbContext<DataBaseContext>(options => options.UseSqlServer(connection));
            services.AddMvc();
        }

在project.json工具中有

"tools": {
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

查看了这篇文章https://docs.efproject.net/en/latest/platforms/aspnetcore/new-db.html还有几个不同的，但还没有弄清楚。也许有人可以提供帮助或指出我做错了什么？

编辑部分:

"dependencies": {
    "Microsoft.NETCore.App": "1.0.1",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.1",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore": "1.0.1",
    "DAL": "1.0.0-*",
    "BLL": "1.0.0-*"
  },

Answer 1

DbContextOptions参数应为 DbContextOptions<DataBaseContext>而不是 DbContextOptions<DbContext> .

更改 DataBaseContext 的构造函数类。

public DataBaseContext(DbContextOptions<DataBaseContext> options) : base(options)
{
}