SeoEngine for filter the link?

Anna Hajare — Wed, 07 Jan 2026 06:35:28 +0000

You absolutely CAN create a small “SEO indexability engine”. And for your use case (?page=2 indexable, ?sort=hhh not indexable), this is actually the best long-term solution.

Below is a clean, production-ready SEO engine for ASP.NET MVC 5.

What this SEO Engine Will Do

Decide indexable vs non-indexable
Handle pagination, sort, filter, search params
Generate canonical URL
Control meta robots automatically
Centralized (no duplicate logic in views)

SEO RULE ENGINE (Concept)

Parameter	Behavior
page	Indexable
sort	Noindex
filter	Noindex
search	Noindex

SEO Decision Model

public class SeoResult
{
    public bool IsIndexable { get; set; }
    public string CanonicalUrl { get; set; }
}

SEO Engine (Core Logic)

public static class SeoEngine
{
    private static readonly HashSet<string> NonIndexableParams =
        new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "sort",
            "filter",
            "search",
            "utm_source",
            "utm_medium"
        };

    public static SeoResult Evaluate(HttpRequestBase request)
    {
        var query = request.QueryString;
        bool hasNonIndexableParam = false;

        foreach (string key in query.Keys)
        {
            if (key == null) continue;

            if (NonIndexableParams.Contains(key))
                hasNonIndexableParam = true;
        }

        var baseUrl = request.Url.GetLeftPart(UriPartial.Path);

        return new SeoResult
        {
            IsIndexable = !hasNonIndexableParam,
            CanonicalUrl = baseUrl
        };
    }
}

Works in ASP.NET MVC 5
Clean extension syntax
No breaking changes

Extension Method for HtmlHelper

public static class SeoEngineExtensions
{
    public static SeoResult Evaluate(this HtmlHelper htmlHelper)
    {
        var request = htmlHelper.ViewContext.HttpContext.Request;
        return SeoEngine.Evaluate(request);
    }
}

Use Engine in Controller

public ActionResult Index(int page = 1, string sort = null)
{
    var seo = SeoEngine.Evaluate(Request);

    ViewBag.CanonicalUrl = seo.CanonicalUrl;
    ViewBag.NoIndex = !seo.IsIndexable;

    ViewBag.Page = page;

    return View();
}

Layout (_Layout.cshtml)

<link rel="canonical" href="@ViewBag.CanonicalUrl" />

@if (ViewBag.NoIndex == true)
{
    <meta name="robots" content="noindex, follow" />
}
else
{
    <meta name="robots" content="index, follow" />
}

What This Engine Achieves

URL	Canonical	Indexable
/articles	/articles	Indexable
/articles?page=2	/articles?page=2	Indexable
/articles?sort=asc	/articles	Noindexable
/articles?sort=asc&page=2	/articles?page=2	Noindexable
/articles?utm_source=fb	/articles	Noindexable

Google-safe
No duplicate content
Crawl budget preserved

Why This Is the RIGHT Approach

Centralized SEO logic
Easy to extend
No fragile Razor conditions
Works with pagination, filters, tracking params
Matches Google best practices

Also Read

Centralized SEO

Anna Hajare — Wed, 07 Jan 2026 06:34:57 +0000

DEV Community: Anna Hajare