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    <p>I needed this for a project so I took: <a href="http://www.freshclickmedia.com/blog/2008/06/aspnet-gravatar-control-update-full-source-included/" rel="noreferrer">http://www.freshclickmedia.com/blog/2008/06/aspnet-gravatar-control-update-full-source-included/</a></p> <p>and turned it into this:</p> <pre><code>public static class GravatarHtmlHelper { public static Gravatar Gravatar( this HtmlHelper htmlHelper, string email ) { return new Gravatar() {Email = email, Size = 50, MaxAllowedRating = WebControls.Gravatar.RatingType.X}; } public static Gravatar Gravatar(this HtmlHelper htmlHelper, string email, bool outputSiteLink) { return new Gravatar() { Email = email, Size = 50, MaxAllowedRating = WebControls.Gravatar.RatingType.X, OutputGravatarSiteLink = outputSiteLink }; } public static Gravatar Gravatar(this HtmlHelper htmlHelper, string email, short size ) { return new Gravatar() { Email = email, Size = size, MaxAllowedRating = WebControls.Gravatar.RatingType.X }; } public static Gravatar Gravatar(this HtmlHelper htmlHelper, string email, short size, bool outputSiteLink) { return new Gravatar() { Email = email, Size = size, MaxAllowedRating = WebControls.Gravatar.RatingType.X, OutputGravatarSiteLink = outputSiteLink}; } } public class Gravatar { public enum RatingType { G, PG, R, X } private string _email; // outut gravatar site link true by default: // customise the link title: public Gravatar() { OutputGravatarSiteLink = true; LinkTitle = "Get your avatar"; } /// &lt;summary&gt; /// The Email for the user /// &lt;/summary&gt; public string Email { get { return _email; } set { _email = value.ToLower(); } } /// &lt;summary&gt; /// Size of Gravatar image. Must be between 1 and 512. /// &lt;/summary&gt; public short Size { get; set; } /// &lt;summary&gt; /// An optional "rating" parameter may follow with a value of [ G | PG | R | X ] that determines the highest rating (inclusive) that will be returned. /// &lt;/summary&gt; public RatingType MaxAllowedRating { get; set; } /// &lt;summary&gt; /// Determines whether the image is wrapped in an anchor tag linking to the Gravatar sit /// &lt;/summary&gt; public bool OutputGravatarSiteLink { get; set; } /// &lt;summary&gt; /// Optional property for link title for gravatar website link /// &lt;/summary&gt; public string LinkTitle { get; set; } /// &lt;summary&gt; /// An optional "default" parameter may follow that specifies the full, URL encoded URL, protocol included, of a GIF, JPEG, or PNG image that should be returned if either the requested email address has no associated gravatar, or that gravatar has a rating higher than is allowed by the "rating" parameter. /// &lt;/summary&gt; public string DefaultImage { get; set; } public override string ToString() { // if the size property has been specified, ensure it is a short, and in the range // 1..512: try { // if it's not in the allowed range, throw an exception: if (Size &lt; 1 || Size &gt; 512) throw new ArgumentOutOfRangeException(); } catch { Size = 80; } // default the image url: string imageUrl = "http://www.gravatar.com/avatar.php?"; if (!string.IsNullOrEmpty(Email)) { // build up image url, including MD5 hash for supplied email: MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); UTF8Encoding encoder = new UTF8Encoding(); MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider(); byte[] hashedBytes = md5Hasher.ComputeHash(encoder.GetBytes(Email)); StringBuilder sb = new StringBuilder(hashedBytes.Length * 2); for (int i = 0; i &lt; hashedBytes.Length; i++) { sb.Append(hashedBytes[i].ToString("X2")); } // output parameters: imageUrl += "gravatar_id=" + sb.ToString().ToLower(); imageUrl += "&amp;rating=" + MaxAllowedRating.ToString(); imageUrl += "&amp;size=" + Size.ToString(); } // output default parameter if specified if (!string.IsNullOrEmpty(DefaultImage)) { imageUrl += "&amp;default=" + HttpUtility.UrlEncode(DefaultImage); } var linkBuilder = new TagBuilder("a"); // if we need to output the site link: if (OutputGravatarSiteLink) { linkBuilder.MergeAttribute("href", "http://www.gravatar.com"); linkBuilder.MergeAttribute("title", LinkTitle); } // output required attributes/img tag: var builder = new TagBuilder("img"); builder.MergeAttribute("width", Size.ToString()); builder.MergeAttribute("height", Size.ToString()); builder.MergeAttribute("src", imageUrl); builder.MergeAttribute("alt", "Gravatar"); string output = builder.ToString(TagRenderMode.Normal); // if we need to output the site link:) if (OutputGravatarSiteLink) { linkBuilder.InnerHtml = builder.ToString(); output = linkBuilder.ToString(TagRenderMode.Normal); } return output; } } </code></pre> <p>Usage:</p> <pre><code>&lt;%= Html.Gravatar("john.e.farrell@gmail.com", true)%&gt; </code></pre> <p>You'll have to add the overloads to the html helper as you need them. I can't do all the work. ;) Not bad for 5 min eh?</p>
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    1. COThanks for this. If only I was more patient -- I already implemented my own solution (posted as an answer)... One comment, the email address should be trimmed before being hashed to guarantee a numeric match. The URL format has been updated a little since this implementation was written, though I suppose it doesn't matter as I'm sure they're backwards compatible.
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