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Parametri
Parametro | Dettagli |
---|---|
IDictionary<string,object> environment | Questa è l'unica raccolta in cui OWIN comunica le informazioni durante una chiamata. Tutte le chiavi possono essere trovate su https://docs.asp.net/en/latest/fundamentals/owin.html#owin-keys |
Osservazioni
Il tipo AppFunc
è solo un alias per Func<IDictionary<string, object>, Task>
type per abbreviare le firme dei metodi, proprio come typedef
in C ++.
Emetti il percorso della richiesta e il tempo impiegato per elaborarlo
//define a short alias to avoid chubby method signatures
using AppFunc = Func<IDictionary<string, object>, Task>;
class RequestTimeMiddleware
{
private AppFunc _next;
public RequestTimeMiddleware(AppFunc next)
{
_next = next;
}
public async Task Invoke(IDictionary<string, object> environment)
{
IOwinContext context = new OwinContext(environment);
var path = context.Request.Path;
var sw = Stopwatch.StartNew();
//Queue up the next middleware in the pipeline
await _next(environment);
//When the request comes back, log the elapsed time
Console.WriteLine($"Request for {path} processed in {sw.ElapsedMilliseconds}ms");
}
}
public static class RequestTimeMiddlewareExtensions
{
//Extension method as syntactic sugar, to get a meaningful way
//in adding the middleware to the pipeline
public static void UseRequestTimeMiddleware(this IAppBuilder app)
{
app.Use<RequestTimeMiddleware>();
}
}
public class Startup
{
public void Configuration(IAppBuilder app)
{
//add the Middleware as early as possible
app.UseRequestTimeMiddleware();
//Queue up every other module
app.Use(async (environment, next) =>
{
await environment.Response.WriteAsync("Hello from the console world");
await next();
});
}
}
Modified text is an extract of the original Stack Overflow Documentation
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