how to fix Error No DataBase Provider when Everything is okay - asp.net-core-mvc

Question

When I want to Insert A New Object into the db bellow Error Occured:
No database provider has been configured for this DbContext
Services:
private IConfiguration config;
public Startup(IConfiguration config) => this.config = config;
public void ConfigureServices(IServiceCollection services)
{
services.AddEntityFrameworkSqlServer().AddDbContext<DataContext>(options => options.UseSqlServer(config["ConnectionStrings:MainConnection"]));
services.AddMvc();
}
DataContext:
public class DataContext:DbContext
{
public DataContext() { }
public DataContext(DbContextOptions<DataContext> options) : base(options) { }
public DbSet<Request> Request { get; set; }
public DbSet<AdminAccept> AdminAccept { get; set; }
public DbSet<Payment> Payment { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder builder)
{
base.OnConfiguring(builder);
}
}
Insert command :
public async Task <int> SaveToStorageAsync()
{
using (DataContext context=new DataContext())
{
context.Request.Add(this);
return await context.SaveChangesAsync();
}
}
however migrations and database created succefully

Answer 1

I solved it finally.
everything is okay but use of using expression cause an error.(I wonder why)
to solving it first of all I removed a using and declare a DataContext as parameter:
public async Task<int> SaveToStorageAsync(DataContext context)
{
context.Request.Add(this);
return await context.SaveChangesAsync();
}
after it initiate constructor in the main controller :
DataContext context;
public HomeController(DataContext context)
{
this.context = context;
}
and finally call function by sending context as a parameter.
hopped you used in your scenarios and good luck

Answer 2

Since you register the DataContext with the constructor receiving a DbContextOptions<DataContext> option.You also need to pass that when you create a DataContext
var optionsBuilder = new DbContextOptionsBuilder<DataContext >();
optionsBuilder.UseSqlServer("Your connection string");
using (DataContext context = new DataContext (optionsBuilder.Options))
{
context.Request.Add(this);
return await context.SaveChangesAsync();
}
I suggest that you could use dbContext by DI in controller which is a more recommended way in asp.net core:
public class StudentsController : Controller
{
private readonly DataContext _context;
public StudentsController(DataContext context)
{
_context = context;
}
public async Task <int> SaveToStorageAsync()
{
_context.Request.Add(this);
return await context.SaveChangesAsync();
}
}
The two ways are included in below link:
https://learn.microsoft.com/en-us/ef/core/miscellaneous/configuring-dbcontext#configuring-dbcontextoptions