asp.net-core Middleware Pass data through the middleware chain
Example
From documentation:
The HttpContext.Items collection is the best location to store data that is only needed while processing a given request. Its contents are discarded after each request. It is best used as a means of communicating between components or middleware that operate at different points in time during a request, and have no direct relationship with one another through which to pass parameters or return values.
HttpContext.Items is a simple dictionary collection of type IDictionary<object, object>. This collection is
- available from the start of an
HttpRequest - and is discarded at the end of each request.
You can access it by simply assigning a value to a keyed entry, or by requesting the value for a given key.
For example, some simple Middleware could add something to the Items collection:
app.Use(async (context, next) =>
{
// perform some verification
context.Items["isVerified"] = true;
await next.Invoke();
});
and later in the pipeline, another piece of middleware could access it:
app.Run(async (context) =>
{
await context.Response.WriteAsync("Verified request? " + context.Items["isVerified"]);
});
