How do I create custom middleware in ASP.NET Core?

How do I create custom middleware in ASP.NET Core?

To create custom middleware in ASP.NET Core, you need to define a class that implements the middleware logic.

What methods do I need to implement in that class?

You typically implement the Invoke or InvokeAsync method, which contains the logic for your middleware.

Can you give me an example of a simple middleware?

Sure! Here's a simple example that logs the request path:

public class RequestLoggingMiddleware {
    private readonly RequestDelegate _next;

    public RequestLoggingMiddleware(RequestDelegate next) {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context) {
        Console.WriteLine(context.Request.Path);
        await _next(context);
    }
}

How do I register this middleware in the Startup class?

You can register it in the Configure method of your Startup class using app.UseMiddleware<RequestLoggingMiddleware>();.