SeoTags

SeoTags create all SEO tags you need such as meta, link, twitter card (twitter:), open graph (og:), and JSON-LD schema (structred data)..

How to use

1. Install Package

PM> Install-Package SeoTags

2. Add Services and Configure

Everything you need to do is configuring SeoInfo object and render this in your _Layout.cshtml.
This configuring can be achived by set properties of SeoInfo object in three ways:

When register services using services.AddSeoTags(seoInfo => { ... }) method in Startup.cs
Html.SetSeoInfo(seoInfo => { ... })method in your views .cshtml (Mvc or RazorPages)
HttpContext.SetSeoInfo(seoInfo => { ... }) method anywhere you access to HttpContext object (for example in your Controller or PageModel)

There is common options which is not page spacific like site title, site twitter id, site facebook id, open search url, feeds (Rss or Atom), and etc... Usually this values set when register services using services.AddSeoTags(seoInfo => { ... }) method in Startup.cs.

public void ConfigureServices(IServiceCollection services)
{
    //...
    services.AddSeoTags(seoInfo =>
    {
        seoInfo.SetSiteInfo(
            siteTitle: "My Site Title", 
            siteTwitterId: "@MySiteTwitter",  //optional
            siteFacebookId: "https://facebook.com/MySite",  //optional
            openSearchUrl: "https://site.com/open-search.xml",  //optional
            robots: "index, follow"  //optional
        );

        //optional
        seoInfo.AddFeed(
            title: "Post Feeds",
            url: "https://site.com/rss/",
            feedType: FeedType.Rss);

        //optional
        seoInfo.AddDnsPrefetch("https://fonts.gstatic.com/", "https://www.google-analytics.com");

        //optional
        seoInfo.AddPreload(new Preload("https://site.com/site.css"),
            new Preload("https://site.com/app.js"),
            new Preload("https://site.com/fonts/Font.woff2"),
            new Preload("https://site.com/fonts/Font_Light.woff2"),
            new Preload("https://site.com/fonts/Font_Medium.woff2"),
            new Preload("https://site.com/fonts/Font_Bold.woff2"));

        //optional
        seoInfo.SetLocales("en_US");
    });
    //...
}

3. Place it in your _Layout.cshtml

Call Html.SeoTags() to render seo tags. This method has two overload, one with SeoInfo argument (if you need to pass custom instance of SeoInfo object), and one without argument which retrive configured SeoInfo object from registred services.

<!DOCTYPE html>
    <html lang="en">
    <head>
    
        <!-- You don't need this anymore -->
        @*<meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>@ViewData["Title"] - Site Title</title>*@
        <!-- SeoTags generates all of these for you. -->
    
        @Html.SeoTags()

4. Configure SEO info in your view

Set your SEO options with calling Html.SetSeoInfo(seoInfo => { ... }) method in your view .cshtml.
You can do the same with calling HttpContext.SetSeoInfo(seoInfo => { ... }) anywhere you access to HttpContext object (for example in your Controller or PageModel)

@{
    //ViewData["Title"] = "Page Title";
    Html.SetSeoInfo(seoInfo =>
    {
        seoInfo.SetCommonInfo(
            pageTitle: "SEO Tags for ASP.NET Core",
            description: "Create all SEO tags you need such as meta, link, twitter card (twitter:), open graph (og:), and ...",
            url: "https://site.com/url/",
            keywordTags: new[] { "SEO", "AspNetCore", "MVC", "RazorPages" },
            seeAlsoUrls: new[] { "https://site.com/see-also-1", "https://site.com/see-also-2" });

        seoInfo.SetImageInfo(
            url: "https://site.com/uploads/image.jpg",
            width: 1280,
            height: 720,
            alt: "Image alt",
            //mimeType: "image/jpeg", //optional: detect from url file extension
            cardType: SeoTags.TwitterCardType.SummaryLargeImage);

        seoInfo.SetArticleInfo(
            authorName: "Author Name",
            publishDate: DateTimeOffset.Now,
            modifiedDate: DateTimeOffset.Now,
            authorTwitterId: "@MyTwitterId",
            authorFacebookId: "https://facebook.com/MyUserId",
            authorUrl: "https://github.com/author-profile",
            section: "SEO");

        seoInfo.AddFeed("Post Comments", "https://site.com/post/comment/rss", SeoTags.FeedType.Rss);
    });
}

5. Rendred Output:

The following code shows the rendered output.

<meta charset="utf-8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1" />
<meta name="viewport" content="width=device-width, initial-scale=1" />

<link rel="preconnect" href="https://fonts.gstatic.com/" crossorigin />
<link rel="preconnect" href="https://www.google-analytics.com" crossorigin />
<link rel="dns-prefetch" href="https://fonts.gstatic.com/" />
<link rel="dns-prefetch" href="https://www.google-analytics.com" />
<link rel="preload" as="style" href="https://site.com/site.css" />
<link rel="preload" as="script" href="https://site.com/app.js" />
<link rel="preload" as="font" type="font/woff2" href="https://site.com/fonts/Font.woff2" crossorigin />
<link rel="preload" as="font" type="font/woff2" href="https://site.com/fonts/Font_Light.woff2" crossorigin />
<link rel="preload" as="font" type="font/woff2" href="https://site.com/fonts/Font_Medium.woff2" crossorigin />
<link rel="preload" as="font" type="font/woff2" href="https://site.com/fonts/Font_Bold.woff2" crossorigin />
<link rel="preload" as="image" type="image/jpeg" href="https://site.com/uploads/image.jpg" />

<title>SEO Tags for ASP.NET Core - My Site Title</title>
<meta name="title" content="SEO Tags for ASP.NET Core - My Site Title" />
<meta name="description" content="Create all SEO tags you need such as meta, link, twitter card (twitter:), open graph (og:), and ..." />
<meta name="keywords" content="SEO, AspNetCore, MVC, RazorPages" />
<meta name="author" content="Author Name" />
<link rel="author" href="https://github.com/author-profile" />
<link rel="canonical" href="https://site.com/url/" />
<link rel="application/opensearchdescription+xml" title="My Site Title" href="https://site.com/open-search.xml" />
<link rel="alternate" type="application/rss+xml" title="Post Feeds" href="https://site.com/rss/" />
<link rel="alternate" type="application/rss+xml" title="Post Comments" href="https://site.com/post/comment/rss" />
<meta name="robots" content="index, follow" />

<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:title" content="SEO Tags for ASP.NET Core" />
<meta name="twitter:description" content="Create all SEO tags you need such as meta, link, twitter card (twitter:), open graph (og:), and ..." />
<meta name="twitter:site" content="@MySiteTwitter" />
<meta name="twitter:creator" content="@MyTwitterId" />
<meta name="twitter:image" content="https://site.com/uploads/image.jpg" />
<meta name="twitter:image:width" content="1280" />
<meta name="twitter:image:height" content="720" />
<meta name="twitter:image:alt" content="Image alt" />

<meta property="og:type" content="article" />
<meta property="og:title" content="SEO Tags for ASP.NET Core" />
<meta property="og:description" content="Create all SEO tags you need such as meta, link, twitter card (twitter:), open graph (og:), and ..." />
<meta property="og:url" content="https://site.com/url/" />
<meta property="og:site_name" content="My Site Title" />
<meta property="og:locale" content="en_US" />
<meta property="og:image" content="https://site.com/uploads/image.jpg" />
<meta property="og:image:secure_url" content="https://site.com/uploads/image.jpg" />
<meta property="og:image:type" content="image/jpeg" />
<meta property="og:image:width" content="1280" />
<meta property="og:image:height" content="720" />
<meta property="og:image:alt" content="Image alt" />
<meta property="article:publisher" content="https://facebook.com/MySite" />
<meta property="article:author" content="https://facebook.com/MyUserId" />
<meta property="article:published_time" content="2021-07-24T05:03:22+00:00" />
<meta property="article:modified_time" content="2021-07-24T05:03:22+00:00" />
<meta property="article:section" content="SEO" />
<meta property="article:tag" content="SEO" />
<meta property="article:tag" content="AspNetCore" />
<meta property="article:tag" content="MVC" />
<meta property="article:tag" content="RazorPages" />
<meta property="og:see_also" content="https://site.com/see-also-1" />
<meta property="og:see_also" content="https://site.com/see-also-2" />