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ASP.NET Core - Entity Framework - Code First Add-Migration - Unable to resolve service for type Microsoft.EntityFrameworkCore.Migrations.IMigrator.

Entity Framework Error:

Unable to resolve service for type 'Microsoft.EntityFrameworkCore.Migrations.IMigrator'. This is often because no database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext.OnConfiguring method or by using AddDbContext on the application service provider. If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions<TContext> object in its constructor and passes it to the base constructor for DbContext.


Verify the connectionstring in the appsettings.json file.

  "ConnectionStrings": {
    "CustomerDb":  "Server=(localdb)\\mssqllocaldb;Database=Customer;Trusted_Connection=True;"
On Startup.cs, ConfigureService method, verify, you are correctly initializing the Context

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
            services.Configure<CookiePolicyOptions>(options =>
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;

            services.AddDbContext<AppDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("CustomerDb")));


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