ASP.NET Core DbContext injection
asp.net-core c# dependency-injection entity-framework entity-framework-core
Question
I have a ConfigurationDbContext that I am trying to use. It has multiple parameters, DbContextOptions and ConfigurationStoreOptions.
How can I add this DbContext to my services in ASP.NET Core?
I have attempted the following in my Startup.cs:
ConfigureServices
....
services.AddDbContext<ConfigurationDbContext>(BuildDbContext(connString));
....
private ConfigurationDbContext BuildDbContext(string connString)
{
var builder = new DbContextOptionsBuilder<ConfigurationDbContext>();
builder.UseSqlServer(connString);
var options = builder.Options;
return new ConfigurationDbContext(options, new ConfigurationStoreOptions());
}
Accepted Answer
AddDbContext implementation just registers the context itself and its common dependencies in DI.
Instead of AddDbContext call, it's perfectly legal to manually register your DbContext:
services.AddTransient<FooContext>();
Moreover, you could use a factory method to pass parameters (this is answering the question):
services.AddTransient<FooContext>(provider =>
{
//resolve another classes from DI
var anyOtherClass = provider.GetService<AnyOtherClass>();
//pass any parameters
return new FooContext(foo, bar);
});
P.S., In general, you don't have to register DbContextOptionsFactory and default DbContextOptions to resolve DbContext itself, but it could be necessary in specific cases.
Popular Answer
You can use this in startup.cs.
Detail information : https://docs.microsoft.com/en-us/ef/core/miscellaneous/configuring-dbcontext
Detail Example : Getting started with ASP.NET Core MVC and Entity Framework Core
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddDbContext<ApplicationDbContext>(options =>options.
UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
}
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