accessing dbcontext inside Startup.Configure while adding redirects using app.UseRewriter().Add()

Question

I need to add redirects based on hostname, reading the map of source-path/destination-path from the database.

public void Configure(IApplicationBuilder app, IHostingEnvironment env, IMemoryCache memoryCache, ILoggerFactory loggerFactory, myDbContext db) { app.UseRewriter(new RewriteOptions() .AddRedirect("(.*)/$", "$1") .Add(ctx => { var req = ctx.HttpContext.Request; var hostName = req.Host; /* ** here I am willing to use db to do something like... */ var redirects = db.redirect .Where(r=> r.host == hostName ).ToList(); /* ** so that I can do something like this: */ var newUrl = DetermineNewUrl(req,redirects); var response = ctx.HttpContext.Response; response.Headers[Microsoft.Net.Http.Headers.HeaderNames.Location] = newUrl; response.StatusCode = 301; ctx.Result = RuleResult.EndResponse; })); }

But it doesn't work, because db is supposedly disposed:

DbContext is added in ConfigureServices like this (scoped):

 var connection = Configuration.GetConnectionString("DefaultConnection"); services.AddDbContext<gommeautoContext>(options => options.UseSqlServer(connection, sqlServerOptionsAction: sqlOptions => { sqlOptions.EnableRetryOnFailure(maxRetryCount: 5, maxRetryDelay: TimeSpan.FromSeconds(5), errorNumbersToAdd: null); }));

And my last attempt to make it work was using the following code:

 using (var serviceScope = app.ApplicationServices.CreateScope()) { var services = serviceScope.ServiceProvider; var _db = services.GetService<gommeautoContext>(); var redirects = db.redirect .Where(r=> r.host == hostName ).ToList(); }

But didn't help.

I assume it's not that simple to access dbContext inside UseRewriter.Add(, and I can't figure out how to do it...

Anyone does?

Scoped I guess, edited question to add a code snippet of how is added in ConfigureServices, my last attempt was this: using (var serviceScope = app.ApplicationServices.CreateScope()) { var services = serviceScope.ServiceProvider; var _db = services.GetService<gommeautoContext>(); } but didn't work. — Max Favilli
– Max Favilli, Commented May 14, 2019 at 18:43
Looks good, take a look at this post (stackoverflow.com/questions/38704025/…) The accepted answer and the answer by Peter may help you. +1 from me. — Ryan Wilson
– Ryan Wilson, Commented May 14, 2019 at 18:49

Max Favilli · Accepted Answer · 2019-05-14 19:41:19Z

This approach was actually correct:

using (var serviceScope = app.ApplicationServices.CreateScope()) { var services = serviceScope.ServiceProvider; var _db = services.GetService<gommeautoContext>(); ... }

But I was misleaded by another issue, as pointed out here https://stackoverflow.com/a/43876571/395773 I had an earlier awaited call in my code returning void, implicitly disposing the context.

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