asp.net-core - DotNet Core 3 EF 3 与 Cosmos DB 问题

问题描述

我正在尝试使用 Cosmos DB 数据库创建基于 .Net Core 3 和 EF Core 3 的应用程序。

我已经按照以下步骤，

public void ConfigureServices(IServiceCollection services)
{
 services.AddDbContext<MyDbContext>();
}

public class MyDbContextFactory : IDesignTimeDbContextFactory<MyDbContextFactory >
    {

        public MyDbContextFactory CreateDbContext(string[] args)
        {

            // Get environment
            string environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

            // Build config
            var config = new ConfigurationBuilder()
                .SetBasePath(Path.Combine(Directory.GetCurrentDirectory()))
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{environment}.json", optional: true)
                .AddEnvironmentVariables()
                .Build();

            var cosmosDbOptions = config.GetSection("CosmosDb").Get<CosmosDbOptions>();
            var (cosmosDbEndpoint, cosmosDbKey, databaseName, collectionData) = cosmosDbOptions;
            var collectionNames = collectionData.Select(c => c.Name).ToList();

            var optionsBuilder = new DbContextOptionsBuilder<MyDbContextFactory>();
            optionsBuilder.UseCosmos(cosmosDbEndpoint, cosmosDbKey, databaseName);

            return new ActivityLoggerContext(optionsBuilder.Options);
        }

和

public class MyDbContextFactory : DbContext
    {
        public MyDbContextFactory (DbContextOptions<MyDbContextFactory > dbContextOptions) : base(dbContextOptions)
        {
        }

        public DbSet<UserModel> Users { get; set; }

    }

当我执行命令时，

> dotnet ef database update

我收到以下错误。任何帮助或指针将不胜感激

System.InvalidOperationException：无法解析类型“Microsoft.EntityFrameworkCore.Migrations.IMigrator”的服务。这通常是因为没有为此 DbContext 配置数据库提供程序。可以通过覆盖 DbContext.OnConfiguring 方法或在应用程序服务提供者上使用 AddDbContext 来配置提供者。如果使用了 AddDbContext，那么还要确保您的 DbContext 类型在其构造函数中接受 DbContextOptions 对象并将其传递给 DbContext 的基本构造函数。在 Microsoft.EntityFrameworkCore.Infrastructure.Internal.InfrastructureExtensions.GetService[TService](IInfrastructure1 accessor) at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure1 个访问者）在 Microsoft.EntityFrameworkCore.Design.DesignTimeServiceCollectionExtensions.<>c__DisplayClass1_0.b__7(IServiceProvider _) 在 Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context) 在 Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitDisposeCache(ServiceCallSite transientCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSite(ServiceCallSite callSite, TArgument argument) 在 Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope 范围) 在 Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass1_0.b__0(ServiceProviderEngineScope 范围) Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope) 在 Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType) 在 Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) 在 Microsoft .Extensions.DependencyInjection.ServiceProviderServiceExtensions。Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType) 的 Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.EnsureServices(IServiceProvider services) 的 GetService[T](IServiceProvider provider)。 OperationExecutor.UpdateDatabaseImpl(String targetMigration, String contextType) 在 Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() 在 Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() 的 Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String contextType) 的 Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase(String targetMigration, String contextType)。 EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute（动作动作）Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() 的 Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String contextType) 的 Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase(String targetMigration, String contextType)。 EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute（动作动作）无法解析类型“Microsoft.EntityFrameworkCore.Migrations.IMigrator”的服务。这通常是因为没有为此 DbContext 配置数据库提供程序。可以通过覆盖 DbContext.OnConfiguring 方法或在应用程序服务提供者上使用 AddDbContext 来配置提供者。如果使用了 AddDbContext，那么还要确保您的 DbContext 类型在其构造函数中接受 DbContextOptions 对象并将其传递给 DbContext 的基本构造函数。

标签： asp.net-coreazure-cosmosdbef-core-3.0

asp.net-core - DotNet Core 3 EF 3 与 Cosmos DB 问题

问题描述

解决方案

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