无法迁移 ASP.NET 核心 API 中的第二个数据库

Question

I'm trying to use two different databases in one api.

These are the contexts:

public class DatabaseOneDBContext : DbContext, IDatabaseOneDBContext
{
    public DatabaseOneDBContext(DbContextOptions<DatabaseOneDBContext> options)
        : base(options)
    {

    }

    public DbSet<Alena> Alena { get; set; }

    public async Task<int> SaveChangesAsyncOne()
    {
        return await base.SaveChangesAsync(); 
    }
}

public class DatabaseTwoDBContext : DbContext, IDatabaseTwoDBContext
{
    private readonly IDatabaseTwoDBContext _context;

    public DatabaseTwoDBContext(IDatabaseTwoDBContext context)
    {
        this._context = context;
    }

    public DbSet<Cortana> Cortana { get; set; }

    public async Task<int> SaveChangesAsyncTwo()
    {
        return await base.SaveChangesAsync(); 
    }
}

appsettings.json

"ConnectionStrings": {
    "ConnectionDB1": "Server=.\\SQLEXPRESS;Database=DatabaseOne;Trusted_Connection=True;MultipleActiveResultSets=true",
    "ConnectionDB2": "Server=.\\SQLEXPRESS;Database=DatabaseTwo;Trusted_Connection=True;MultipleActiveResultSets=true"
},

Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Forecast.DatabaseOne;
using Forecast.DatabaseOne.Contracts;
using Forecast.ServiceOne.Contracts;
using Forecast.ServiceOne;
using Serilog;
using Forecast.DatabaseTwo;
using Forecast.DatabaseTwo.Contracts;
using Forecast.ServiceTwo.Contracts;
using Forecast.ServiceTwo;

namespace Forecast.Web
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
            Log.Logger = new LoggerConfiguration()
                .ReadFrom.Configuration(Configuration)
                .CreateLogger();
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<DatabaseOneDBContext>(options =>
                    options.UseSqlServer(Configuration.GetConnectionString("ConnectionDB1"),
                    ef => ef.MigrationsAssembly("Forecast.DatabaseOne")));

            services.AddScoped<IDatabaseOneDBContext>(provider => provider.GetService<DatabaseOneDBContext>());

            services.AddDbContext<DatabaseTwoDBContext>(options =>
                    options.UseSqlServer(Configuration.GetConnectionString("ConnectionDB2"),
                    ef => ef.MigrationsAssembly("Forecast.DatabaseTwo")));

            services.AddScoped<IDatabaseTwoDBContext>(provider => provider.GetService<DatabaseTwoDBContext>());

            services.AddTransient<IAlenaService, AlenaService>();
            services.AddTransient<ICortanaService, CortanaService>();

            services.AddApiVersioning(apiVerConfig =>
            {
                apiVerConfig.AssumeDefaultVersionWhenUnspecified = true;
                apiVerConfig.DefaultApiVersion = new ApiVersion(new DateTime(2022, 1, 22));
            });

            services.AddHealthChecks()
                .AddDbContextCheck<DatabaseOneDBContext>();

            services.AddSwaggerGen(options =>
            {
                options.SwaggerDoc("v1a", new Microsoft.OpenApi.Models.OpenApiInfo
                {
                    Title = "ForecastService - Alena Web API",
                    Version = "v1a",
                    Description = "test service"
                });
            });

            services.AddControllers();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });

            app.UseHealthChecks("/checkhealth");

            app.UseSwagger();
            app.UseSwaggerUI(options =>
                {
                    options.SwaggerEndpoint("/swagger/v1a/swagger.json", "Alena API v1a");
                });
        }
    }
}

When I use this

add-migration -context DatabaseOneDBContext 
update-database -context DatabaseOneDBContext 

it works and default project is DatabaseOne , but when I try to do the same thing for DatabaseTwoDBContext (I change the default project to DatabaseTwo ), it just sleeps the process and I have to restart my PC so I can try again.

Help me solve this

Answer 1

it seems to me that you need to replace this line with the same one as in the first context

Try change this

  private readonly IDatabaseTwoDBContext _context;

  public DatabaseTwoDBContext(IDatabaseTwoDBContext context)
  {
      this._context = context;
  }

To this

public DatabaseOneDBContext(DbContextOptions<DatabaseTwoDBContext> options)
    : base(options)
{

}

---

Perhaps the second context is recursively trying to resolve the dependency IDatabaseTwoDBContext in constructor