Microsoft.Http.Headers.CacheControl.ToString C# (CSharp) Méthode

        public override string ToString()
        {
            List<string> x = new List<string>();
            //"no-cache"
            //"no-cache" [ "=" <"> 1#field-name <">
            if (this.NoCache)
            {
                x.Add(Make("no-cache", noCacheHeaders));
            }
            //"no-store"
            if (this.NoStore)
            {
                x.Add("no-store");
            }

            //"max-age" "=" delta-seconds
            if (this.MaxAge.HasValue)
            {
                x.Add(Make("max-age", this.MaxAge.Value));
            }
            //"max-stale" [ "=" delta-seconds ]
            if (this.MaxStale)
            {
                if (this.MaxStaleLimit.HasValue)
                {
                    x.Add(Make("max-stale", this.MaxStaleLimit.Value));
                }
                else
                {
                    x.Add("max-stale");
                }
            }
            //"min-fresh" "=" delta-seconds
            if (this.MinFresh.HasValue)
            {
                x.Add(Make("min-fresh", this.MinFresh.Value));
            }
            //"must-revalidate"
            if (this.MustRevalidate)
            {
                x.Add("must-revalidate");
            }
            //"no-transform"
            if (this.NoTransform)
            {
                x.Add("no-transform");
            }
            //"only-if-cached"
            if (this.OnlyIfCached)
            {
                x.Add("only-if-cached");
            }
            //"private" [ "=" <"> 1#field-name <"> ]
            if (this.Private)
            {
                x.Add(Make("private", privateHeaders));
            }
            //"proxy-revalidate"
            if (this.ProxyRevalidate)
            {
                x.Add("proxy-revalidate");
            }
            //"public"
            if (this.Public)
            {
                x.Add("public");
            }
            if (this.SharedMaxAge.HasValue)
            {
                x.Add(Make("s-maxage", this.SharedMaxAge.Value));
            }

            //cache-extension
            if (this.extensions != null)
            {
                foreach (var e in this.extensions)
                {
                    x.Add(e);
                }
            }

            return string.Join(", ", x.ToArray());
        }
        static TimeSpan GetDeltaSeconds(string directive)