asp.net core - How to pass variable from controller to filter

Question

I have a controller. On the controller's post method, there is a variable (an object variable) I want to pass to my action filter: the method:

public void OnActionExecuted(ActionExecutedContext context)...

Any suggestions on how achieve this?

Answer 1

Use HttpContext.Items . It's a key / value collection that exists for the duration of a single request.

In your controller, add something:

HttpContext.Items["Something"] = "something I need later";

Then in the OnActionExecuted method pull it out:

var something = context.HttpContext.Items["Something"] as string;

Everything you pull out will be of type object so make sure you cast it to what it was.