Here is a quick little URL Helper extension method to add Gravatar images/photos/avatars to your page:

public static string GravatarUrl(this UrlHelper url, string email, int size)

{

    string imageUrl = ConfigurationManager.AppSettings["DefaultGravatar"];

    if (imageUrl.StartsWith("~/"))

    {

        imageUrl = url.Absolute(imageUrl);

    }


    if (string.IsNullOrEmpty(email))

    {

        return imageUrl;

    }


    string md5 = email.ToLowerInvariant().MD5();

    return string.Format(

        "http://www.gravatar.com/avatar/{0}.jpg?d={1}&s={2}&r=g",

        md5.ToLowerInvariant(),

        url.Encode(imageUrl),

        size);

}


public static string GravatarUrl(this UrlHelper url, string email)

{

    return url.GravatarUrl(email, 32);

}

It uses another custom URL Helper extension method Absolute to generate an absolute URL to a default image (based on an application relative url).

The Absolute extension method is similar to the ActionAbsolute method I posted earlier:

public static string Absolute(this UrlHelper url, string contentUrl)

{

    return new Uri(GetBaseUrl(url), url.Content(contentUrl))

        .AbsoluteUri;

}

And it also used the MD5 extension method from yesterdays post.

ASP.NET MVC · Extension Methods · Gravatar

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