A Razor component that displays a Gravatar image for a user's email address

Gravatar.razor

@* Creates a Gravatar image using Bootstrap styling from email address *@
<img class="rounded-circle" src="@url" />
@code
{
  [Parameter] public string Email { get; set; }
  [Parameter] public int Size { get; set; } = 24;

  protected override void OnParametersSet()
  {
    // create hash
    var bytes = System.Text.Encoding.UTF8.GetBytes(Email.ToLower());
    var hash = System.Security.Cryptography.MD5.HashData(bytes);
    var hex = string.Join("", hash.Select(x => x.ToString("x2")));
    url = $"https://www.gravatar.com/avatar/{hex}?s={sizeClean}";
  }

  const int minSize = 8;
  private int sizeClean => Size>= minSize ? Size: minSize;
  private string url = null;
}