Umbraco - Open Graph tags.cshtml

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage
@using PG.UmbracoExtensions.Helpers

@*
    OPEN GRAPH METATAGS widget

    Used by social networks to fetch right data about page (shared).
    
    Must be inserted in head element with prefix="og: http://ogp.me/ns#" attribute.

    Required content node properties: metaDescription

    NOTE: set "sharingImageUrl" to default sharing image url

*@
@{
    var sharingImageUrl = ""; //doesn't work with //
    
    String sharingDescription = Model.Content.GetPropertyValue<String>("metaDescription");
    if (String.IsNullOrEmpty(sharingDescription))
    {
        if (Model.Content.HasProperty("shortText") && Model.Content.HasValue("shortText"))
        {
            sharingDescription = Umbraco.StripHtml(Umbraco.Truncate(Model.Content.GetPropertyValue<String>("shortText"), 200, true).ToString()).ToString();
        }
        else
        {
            sharingDescription = Umbraco.Field("metaDescription", recursive: true).ToString();
        }
    }

    if (Model.Content.HasProperty("thumbnail") && Model.Content.HasValue("thumbnail"))
    {
        sharingImageUrl = Umbraco.GetFullUrl(Model.Content.GetThumbnailUrl());
    }
        
}

    <meta property="og:title" content="@Umbraco.Field("pageName")" />
    <meta property="og:description" content="@sharingDescription" />
    <meta property="og:url" content="@library.NiceUrlWithDomain(Model.Content.Id);" />
    <meta property="og:image" content="@sharingImageUrl" />