Web API: how to read action attribute and parameters from HttpContext

Question

In regular class, I need to read following from the HttpContext:

Controller and action name
Action's attribute (I could get that through HttpActionContext.ActionDescriptor.GetCustomAttributes<type>() but here I don't have HttpActionContext - I only have HttpContext)
Read argument (like actionContext.ActionArguments["paramName"], but again - I only have a HttpContext)

It's not an action filter and not a controller class. But, I can access HttpContext.

ya, I can not find the value (posted value) that I could see under actionContext.ActionArguments["paramName"]. — user3711357
– user3711357, Commented Jun 7, 2018 at 20:00

Maik van den Hengel · Accepted Answer · 2020-08-05 12:31:33Z

14

From asp.net core 3.0 https://stackoverflow.com/a/60602828/10612695

public async Task Invoke(HttpContext context)
{
    // Get the enpoint which is executing (asp.net core 3.0 only)
    var executingEnpoint = context.GetEndpoint();

    // Get attributes on the executing action method and it's defining controller class
    var attributes = executingEnpoint.Metadata.OfType<MyCustomAttribute>();

    await next(context);

    // Get the enpoint which was executed (asp.net core 2.2 possible after call to await next(context))
    var executingEnpoint2 = context.GetEndpoint();

    // Get attributes on the executing action method and it's defining controller class
    var attributes2 = executingEnpoint.Metadata.OfType<MyCustomAttribute>();
}

answered Aug 5, 2020 at 12:31

Maik van den Hengel

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