Blazor Server (EF Core) and database connection - postgresql

Question

Sorry for the rudimentary question.
I'm currently studying application development with Blazor Server and am having trouble connecting to a database.
I'm trying to use DI to connect to the database.
I created a code that uses the factory pattern as shown below, but an error occurs in the part that gets the connection string.
public void ConfigureServices(IServiceCollection services)
{
//error:CS0121 Inappropriate call between the following methods or properties: 'Microsoft.Extensions.DependencyInjection.EntityFrameworkServiceCollectionExtensions.AddDbContextFactory<TContext>(Microsoft.Extensions.DependencyInjection.IServiceCollection, System.Action<Microsoft.EntityFrameworkCore.DbContextOptionsBuilder>, Microsoft.Extensions.DependencyInjection.ServiceLifetime)' と 'BlazorSv.Models.FactoryExtensions.AddDbContextFactory<TContext>(Microsoft.Extensions.DependencyInjection.IServiceCollection, System.Action<Microsoft.EntityFrameworkCore.DbContextOptionsBuilder>, Microsoft.Extensions.DependencyInjection.ServiceLifetime)'
services.AddDbContextFactory<BlazorSv.Models.SQLbeginnerContext>(options => options.UseNpgsql(Configuration.GetConnectionString("DBConnection")));
services.AddRazorPages();
services.AddServerSideBlazor();
services.AddSingleton<WeatherForecastService>();
}
I thought that the definition of the <Models.SQLbeginnerContext> part was ambiguous, so I wrote the hierarchy, but it didn't work.
What should I do about this error?
I want some advice
Below is SQLbegginerContext.cs that describes StartUp.cs and the factory pattern.
StartUp.cs
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
//error:CS0121 Inappropriate call between the following methods or properties: 'Microsoft.Extensions.DependencyInjection.EntityFrameworkServiceCollectionExtensions.AddDbContextFactory<TContext>(Microsoft.Extensions.DependencyInjection.IServiceCollection, System.Action<Microsoft.EntityFrameworkCore.DbContextOptionsBuilder>, Microsoft.Extensions.DependencyInjection.ServiceLifetime)' と 'BlazorSv.Models.FactoryExtensions.AddDbContextFactory<TContext>(Microsoft.Extensions.DependencyInjection.IServiceCollection, System.Action<Microsoft.EntityFrameworkCore.DbContextOptionsBuilder>, Microsoft.Extensions.DependencyInjection.ServiceLifetime)'
services.AddDbContextFactory<Models.SQLbeginnerContext>(options => options.UseNpgsql(Configuration.GetConnectionString("DBConnection")));
services.AddRazorPages();
services.AddServerSideBlazor();
services.AddSingleton<WeatherForecastService>();
}
// 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();
}
else
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapBlazorHub();
endpoints.MapFallbackToPage("/_Host");
});
}
}
SQLbegginerContext.cs
public interface IDbContextFactory<TContext> where TContext : DbContext
{
TContext CreateDbContext();
}
public class blazordbFactory<TContext> : IDbContextFactory<TContext> where TContext : DbContext
{
public blazordbFactory(IServiceProvider provider)
{
this.provider = provider;
}
private readonly IServiceProvider provider;
public TContext CreateDbContext()
{
return ActivatorUtilities.CreateInstance<TContext>(provider);
}
}
public static class FactoryExtensions
{
public static IServiceCollection AddDbContextFactory<TContext>(
this IServiceCollection collection,
Action<DbContextOptionsBuilder> optionsAction = null,
ServiceLifetime contextAndOptionsLifetime = ServiceLifetime.Singleton)
where TContext : DbContext
{
collection.Add(new ServiceDescriptor(
typeof(IDbContextFactory<TContext>),
sp => new blazordbFactory<TContext>(sp),
contextAndOptionsLifetime));
collection.Add(new ServiceDescriptor(
typeof(DbContextOptions<TContext>),
sp => GetOptions<TContext>(optionsAction, sp),
contextAndOptionsLifetime));
return collection;
}
private static DbContextOptions<TContext> GetOptions<TContext>(
Action<DbContextOptionsBuilder> action,
IServiceProvider sp = null) where TContext : DbContext
{
var optionsBuilder = new DbContextOptionsBuilder<TContext>();
if (sp != null)
{
optionsBuilder.UseApplicationServiceProvider(sp);
}
action?.Invoke(optionsBuilder);
return optionsBuilder.Options;
}
}
public partial class SQLbeginnerContext : DbContext
{
public SQLbeginnerContext()
{
}
public SQLbeginnerContext(DbContextOptions<SQLbeginnerContext> options)
: base(options)
{
}
追記：SQLbegginer.cs
//Comment out this part
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder){
if (!optionsBuilder.IsConfigured)
{
optionsBuilder.UseNpgsql("Host=localhost; Database=SQLbeginner; Username=user; Password=****")
}
}