Making Session Variables Work in .NET Core
The Problem
As noted, I work with Legacy and often have to bring in variables from the API that must be sustained across session.. (and I’m sure there might be a better way, comment and advise!). Where I am at now, is I query the API and bring in the variables, but how do I keep from calling these over and over? The old solution was session variables and so, that’s where I am at.
When I started to do this on Core, the most helpful article was this (and it’s in my comments):
https://adamstorr.azurewebsites.net/blog/are-you-registering-ihttpcontextaccessor-correctly
He leads you through the basic setup of a HttpContext helper class (that I still use today) and how to configure the startup.. Today, though, I came across a problem: I was able to Set session variables, but the Get was pulling null.
The Reason
Order. Yes, you’ll see 1000 stackflow responses about order in Configure (and I was careful to do this in that method), but now in ConfigureServices (contrary to the example, as I am now using Core 2.2?), order again comes into play:
public void ConfigureServices(IServiceCollection services) { //this MUST be before add mvc or session returns null services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); services.AddMvc();…