How can I inject DBContext to HTTPModule

Question

I have a problem with DBContext while creating httpmodule that uses Entity Framework.
I'd like to inject DBContext into the httpmodule like injecting dependency in constructor.
Is there any solution for me?

in MyHTTPModule

    public class MyHTTPModule: IHttpModule
    {
    ...
        public void OnBeginRequest(object sender, EventArgs e)
        {
            HttpApplication Application = (HttpApplication)sender;
            HttpContext Context = Application.Context;

            string filepath= Context.Request.FilePath;
            MyDBContext db = new MyDBContext();
            var file = db.file.FirstOrDefault(r => r.filename == filepath);
    ...
        }
    }

What I want is injecting dbcontext into httpmodule like:

    public class MyHTTPModule: IHttpModule
    {
        private MyDBContext db;
        public MyHTTPModule(MyDBContext dbcontext)
        {
            db = dbcontext;
        }
    ...
        public void OnBeginRequest(object sender, EventArgs e)
        {
            HttpApplication Application = (HttpApplication)sender;
            HttpContext Context = Application.Context;
            string filepath= Context.Request.FilePath;
            var file = db.file.FirstOrDefault(r => r.filename == filepath);
    ...
        }
    }

galaxyuliana galaxyuliana · Accepted Answer · 2019-09-03T07:32:22

I found simple solution for this problem using Simple Injector.

Installed 3 NuGet packages. (Microsoft.Web.Infrastructure, SimpleInjector, SimpleInjector.Integration.Web)

and created interface for MyDBContext

in Global.asax.cs

private static Container container;

public static Container Container
{
    get { return container ?? (container = RegisterAndVerifyContainer()); }
}

private static Container RegisterAndVerifyContainer()
{
    var container = new Container();
    container.Options.DefaultScopedLifestyle = new WebRequestLifestyle();

    container.Register<IDBContext, MyDBContext>(Lifestyle.Singleton);

    container.Verify();

    return container;
}

in MyDBContext

public partial class MyDBContext: DbContext, IDBContext
{
    public MyDBContext() : base("name=MyDBContext")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<file> file{ get; set; }
}

public interface IDBContext : IDisposable
{
    DbSet<file> file { get; set; }
}

in MyHTTPModule

private IDBContext DBContext;
public MyHTTPModule()
{
    DBContext = Global.Container.GetInstance<IDBContext>();
}

How can I inject DBContext to HTTPModule

1 Answers