C#•15mo ago

❔ How to bring in DbContext?

app.MapPost("/cities", async ([FromBody] City city) => {
    ...
});

app.MapPost("/cities", async ([FromBody] City city) => {
    ...
});

13 Replies

Angius•15mo ago

Inject it Add it as one of the parameters of your lambda

cap5lut•15mo ago

in minimal api every service is injected via parameters, this includes ur db context as well. eg, u could also inject an ILogger by adding one as parameter

Timo MartinsonOP•15mo ago

could someone provide a code snippet ? all i get is:

System.InvalidOperationException: Failure to infer one or more parameters.
Below is the list of parameters that we found: 

Parameter           | Source                        
---------------------------------------------------------------------------------
city                | Body (Attribute)
dataContext         | UNKNOWN

System.InvalidOperationException: Failure to infer one or more parameters.
Below is the list of parameters that we found: 

Parameter           | Source                        
---------------------------------------------------------------------------------
city                | Body (Attribute)
dataContext         | UNKNOWN

Angius•15mo ago

Timo MartinsonOP•15mo ago

this is my data context:

using GetOut.Models;
using Microsoft.EntityFrameworkCore;

namespace GetOut.Data;

public class DataContext : DbContext
{
    public DbSet<City> Cities { get; set; }
    public DbSet<Provider> Providers { get; set; }
    public DbSet<Event> Events { get; set; }
}

using GetOut.Models;
using Microsoft.EntityFrameworkCore;

namespace GetOut.Data;

public class DataContext : DbContext
{
    public DbSet<City> Cities { get; set; }
    public DbSet<Provider> Providers { get; set; }
    public DbSet<Event> Events { get; set; }
}

do I have to change something?

Angius•15mo ago

No, looks good to me How does your MapPost look with the context injected?

Timo MartinsonOP•15mo ago

looks like this:

app.MapPost("/cities", async ([FromBody] City city, DataContext dataContext) => {
    dataContext.Cities.Add(city);
    return Results.Ok();
});

app.MapPost("/cities", async ([FromBody] City city, DataContext dataContext) => {
    dataContext.Cities.Add(city);
    return Results.Ok();
});

Angius•15mo ago

Try adding [FromServices] attribute to the parameter, then Also, just to make sure, your dbcontext is registered in the services?

Timo MartinsonOP•15mo ago

System.InvalidOperationException: No service for type 'GetOut.Data.DataContext' has been registered. how to register it ?

Angius•15mo ago

builder.Services.AddDbContext<DataContext>();

Timo MartinsonOP•15mo ago

OK, I have done it. No database provider has been configured for this DbContext.

Angius•15mo ago

Override the OnConfiguring() method in the dbcontext And configure what provider you want to use

Accord•15mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ How to bring in DbContext?