Generating an canonical automatically for mvc3 webapplication

Question

I want to use canonical url\'s in my website. I read a few things about it on the internet, but i\'m looking for a solution which will automatically generate the canonical for m

Answer 1

For Razor:

I made one extension method for HtmlHelper:

public static MvcHtmlString CanonicalUrl(this HtmlHelper html, string path)
{
    if (String.IsNullOrWhiteSpace(path))
    {
        var rawUrl = html.ViewContext.RequestContext.HttpContext.Request.Url;
        path = String.Format("{0}://{1}{2}", rawUrl.Scheme, rawUrl.Host, rawUrl.AbsolutePath);
    }

    path = path.ToLower();

    if (path.Count(c => c == '/') > 3)
    {
        path = path.TrimEnd('/');
    }

    if (path.EndsWith("/index"))
    {
        path = path.Substring(0, path.Length - 6);
    }

    var canonical = new TagBuilder("link");
    canonical.MergeAttribute("rel", "canonical");
    canonical.MergeAttribute("href", path);
    return new MvcHtmlString(canonical.ToString(TagRenderMode.SelfClosing));
}

To get current URL

public static MvcHtmlString CanonicalUrl(this HtmlHelper html)
{
    var rawUrl = html.ViewContext.RequestContext.HttpContext.Request.Url;

    return CanonicalUrl(html, String.Format("{0}://{1}{2}", rawUrl.Scheme, rawUrl.Host, rawUrl.AbsolutePath));
}

Calling on Razor View:

@Html.CanonicalUrl()