1:  public enum StyleConditions {
   2:     IE6OrLess, IE7OrLess
   3:  }
   4:   
   5:  public static class HtmlHelpers {
   6:     #region Image
   7:     public static string Image(this HtmlHelper helper, string route, string action, int id, int height, int width, int imageType,
   8:        string altText, string cssClass) {
   9:        var urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
  10:        var imageUrl = urlHelper.RouteUrl(route, new RouteValueDictionary(new {
  11:           action = action,
  12:           id = id,
  13:           height = height,
  14:           width = width,
  15:           imageType = imageType
  16:        }));
  17:   
  18:        var imgTag = new TagBuilder("img");
  19:        imgTag.MergeAttribute("src", imageUrl.ToLower());
  20:        imgTag.MergeAttribute("height", height.ToString());
  21:        imgTag.MergeAttribute("width", width.ToString());
  22:   
  23:        if (altText != null)
  24:           imgTag.MergeAttribute("alt", altText);
  25:   
  26:        if (cssClass != null)
  27:           imgTag.AddCssClass(cssClass);
  28:   
  29:        return imgTag.ToString(TagRenderMode.SelfClosing);
  30:     }
  31:     #endregion
  32:   
  33:     #region Meta
  34:     public static string MetaTag(this HtmlHelper helper, string name, string content) {
  35:        var metaTag = new TagBuilder("meta");
  36:        metaTag.MergeAttribute("content", content);
  37:        metaTag.MergeAttribute("name", name);
  38:   
  39:        return metaTag.ToString(TagRenderMode.SelfClosing);
  40:     }
  41:     #endregion
  42:   
  43:     #region Style Tag
  44:     public static string StyleTag(this HtmlHelper helper, string href, string condition) {
  45:        var styleTag = new TagBuilder("link");
  46:        styleTag.MergeAttribute("href", href.ToLower());
  47:        styleTag.MergeAttribute("rel", "stylesheet");
  48:        styleTag.MergeAttribute("type", "text/css");
  49:   
  50:        var html = styleTag.ToString(TagRenderMode.SelfClosing);
  51:        if (condition != null)
  52:           html = String.Format("<!--[if {0}]>{1}<![endif]-->", condition, html);
  53:   
  54:        return html;
  55:     }
  56:   
  57:     public static string StyleTag(this HtmlHelper helper, string href, StyleConditions styleCondition) {
  58:        string condition;
  59:        switch (styleCondition) {
  60:           case StyleConditions.IE6OrLess:
  61:              condition = "lt IE 7";
  62:              break;
  63:           case StyleConditions.IE7OrLess:
  64:              condition = "lt IE 8";
  65:              break;
  66:           default:
  67:              throw new NotImplementedException("StyleCondition not implemented.");
  68:        }
  69:   
  70:        return StyleTag(helper, href, condition);
  71:     }
  72:   
  73:     public static string StyleTag(this HtmlHelper helper, string href) {
  74:        return StyleTag(helper, href, null);
  75:     }
  76:     #endregion
  77:   
  78:     #region Script Tag
  79:     public static string ScriptTag(this HtmlHelper helper, string src) {
  80:        var scriptTag = new TagBuilder("script");
  81:        scriptTag.MergeAttribute("src", src.ToLower());
  82:        scriptTag.MergeAttribute("type", "text/javascript");
  83:   
  84:        return scriptTag.ToString(TagRenderMode.Normal);
  85:     }
  86:     #endregion
  87:   
  88:     #region Recaptcha
  89:     public static string GenerateCaptcha(this HtmlHelper helper, string theme, string publicKey, string privateKey) {
  90:        if (helper.ViewContext.HttpContext.Request.IsAjaxRequest())
  91:           return helper.GenerateAjaxCaptcha(theme, publicKey);
  92:   
  93:        var captchaControl = new RecaptchaControl {
  94:           ID = "recaptcha",
  95:           Theme = theme,
  96:           PublicKey = publicKey,
  97:           PrivateKey = privateKey
  98:        };
  99:   
 100:        var htmlWriter = new HtmlTextWriter(new StringWriter());
 101:        captchaControl.RenderControl(htmlWriter);
 102:   
 103:        return htmlWriter.InnerWriter.ToString();
 104:     }
 105:   
 106:     public static string GenerateAjaxCaptcha(this HtmlHelper helper, string theme, string publicKey) {
 107:        var htmlWriter = new HtmlTextWriter(new StringWriter());
 108:   
 109:        htmlWriter.WriteLine("<script src=\"http://api.recaptcha.net/js/recaptcha_ajax.js\" type=\"text/javascript\"/>");
 110:        htmlWriter.WriteLine("<div id=\"recaptchaAjax\"></div>");
 111:        htmlWriter.WriteLine("<script type=\"text/javascript\">");
 112:        htmlWriter.WriteLine("Recaptcha.create(\"" + publicKey + "\", \"recaptchaAjax\", { theme: \"" + theme + "\" });");
 113:        htmlWriter.WriteLine("</script>");
 114:   
 115:        return htmlWriter.InnerWriter.ToString();
 116:     }
 117:     #endregion
 118:   
 119:     #region Repeater
 120:     // Based on http://haacked.com/archive/2008/05/03/code-based-repeater-for-asp.net-mvc.aspx
 121:   
 122:     public static void Repeater<T>(this HtmlHelper html, IList<T> items,
 123:        Action<T, string> render, Action renderIfEmpty, string cssClass, string cssClassAlt) {
 124:        if (items.IsNullOrEmpty()) {
 125:           renderIfEmpty();
 126:        }
 127:        else {
 128:           int i = 0;
 129:           items.ForEach(item => {
 130:              render(item, (i++ % 2 == 0) ? cssClass : cssClassAlt);
 131:           });
 132:        }
 133:     }
 134:   
 135:     public static void Repeater<T>(this HtmlHelper html, IList<T> items,
 136:        Action<T, string> render, Action renderIfEmpty) {
 137:        Repeater<T>(html, items, render, renderIfEmpty, "", "alt");
 138:     }
 139:   
 140:     public static void Repeater<T>(this HtmlHelper html, string viewDataKey,
 141:        Action<T, string> render, Action renderIfEmpty, string cssClass, string cssClassAlt) {
 142:        var items = GetViewDataAsList<T>(html, viewDataKey);
 143:        Repeater<T>(html, items, render, renderIfEmpty, cssClass, cssClassAlt);
 144:     }
 145:   
 146:     public static void Repeater<T>(this HtmlHelper html, string viewDataKey,
 147:        Action<T, string> render, Action renderIfEmpty) {
 148:        var items = GetViewDataAsList<T>(html, viewDataKey);
 149:        Repeater<T>(html, items, render, renderIfEmpty);
 150:     }
 151:   
 152:     static IList<T> GetViewDataAsList<T>(HtmlHelper html, string viewDataKey) {
 153:        var items = html.ViewContext.ViewData as IList<T>;
 154:        var viewData = html.ViewContext.ViewData as IDictionary<string, object>;
 155:        if (viewData != null) {
 156:           items = viewData[viewDataKey] as IList<T>;
 157:        }
 158:        else {
 159:           items = new ViewDataDictionary(viewData)[viewDataKey]
 160:             as IList<T>;
 161:        }
 162:        return items;
 163:     }
 164:     #endregion
 165:  }