Dependency Injection Implementations aren't the same-CodePudding

I'm a little bit noob with this and I would like to ask the following:

I'm trying to Inject a MyDbContext class vía DI and tried 2 things:

First, in Program.cs I've got

builder.Services.AddScoped<MyDbContext>(p => new MyDbContext(builder.Configuration.GetConnectionString("ApiDotnetDb")));

In the MyDbContext class I've got:

    private readonly String _connString;

    public MyDbContext(String connString)
    {
        this._connString = connString;
    }

    protected override void OnConfiguring(DbContextOptionsBuilder opt)
    {
        opt.UseMySQL(this._connString);
    }

And everything compile and its ok but if I try:

In Program.cs

builder.Services.AddDbContext<MyDbContext>(opt => opt.UseMySQL(builder.Configuration.GetConnectionString("ApiDotnetDb")), ServiceLifetime.Scoped,
  ServiceLifetime.Scoped);

And then in MyDbContextClass like this:

    public MyDbContext(DbContextOptions<DbContext> options) : base(options)
    {
        
    }

I get

System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: webapi.MyDbContext Lifetime: Scoped ImplementationType: webapi.MyDbContext': Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions`1[Microsoft.EntityFrameworkCore.DbContext]' while attempting to activate 'webapi.MyDbContext'.)'

What could it be? Thanks

CodePudding user response：

Change the generic argument for DbContextOptions<T> to use your derived DbContext class:

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