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Gravatar Icons In ASP.NET
By Mads Kristensen
Expert Author
Article Date: 2007-03-26
Gravatar icons can be used on all websites that lets users write comments. It could be in a forum or on a blog.
The image is retrieved from the Gravatar website and is based on the e-mail address of the person that makes the comment.
It is very easy to set up because it is just a normal image where the src attribute point to the Gravatar website.
Here is a method that writes out such an image. It takes an e-mail address and a size.
The default size used by Gravatar is 80 (80x80 pixels), but you can specify a smaller size if you'd like.
protected string Gravatar(string email, int size)
{
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] result = md5.ComputeHash(Encoding.ASCII.GetBytes(email));
System.Text.StringBuilder hash = new System.Text.StringBuilder();
for (int i = 0; i < result.Length; i++)
hash.Append(result[i].ToString("x2"));
System.Text.StringBuilder image = new System.Text.StringBuilder();
image.Append("<img src="");
image.Append("http://www.gravatar.com/avatar.php?");
image.Append("gravatar_id=" + hash.ToString());
image.Append("&rating=G");
image.Append("&size=" + size);
image.Append("&default=");
image.Append(Server.UrlEncode("http://example.com/noavatar.gif"));
image.Append("" alt="" />");
return image.ToString();
}
On the webpage you could then write out the Gravatar image like so:
<%=Gravatar("post@example.com", 60)%>
Comments
About the Author:
Mads Kristensen currently works as a Senior Developer at Traceworks located
in Copenhagen, Denmark. Mads graduated from Copenhagen Technical Academy with a multimedia degree in
2003, but has been a professional developer since 2000. His main focus is on ASP.NET but is responsible for Winforms, Windows- and
web services in his daily work as well. A true .NET developer with great passion for the simple solution.
http://www.madskristensen.dk/
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