async、await、context 和 next 在当前上下文中不存在

Question

I just created a new empty web application using Core 2.2 and wanted to add a piece of middleware but I am not allowed to do so.

app.Use(async (context, next)) =>
        {
            await next;
        }

but it doesn't recognize either async, context, next or await. I've tried to search online but haven't come across anything with this trivial problem. Anyone knows what's causing it? I am using community 2019

Answer 1

It should be

app.Use(async (context, next) =>
    {
        await next();
    })

app.Use() accepts a function as parameter but you pass only async (context, next) as parameter.