I am using the following to generate action links:
using System;
using System.Linq.Expressions;
using System.Text;
using System.Web.Mvc;
using System.Web.Mvc.Html;
using System.Web.Routing;
using Fasterflect;
namespace StackOverflow.Mvc.Extensions
{
public static class HtmlExtensions
{
#region ActionImage
// href image link
public static string ActionImage( this HtmlHelper helper, string href, string linkText, object htmlAttributes,
string alternateText, string imageSrc, object imageAttributes )
{
var sb = new StringBuilder();
const string format = "<a href=\"{0}\"{1}>{2}</a>";
string image = helper.Image( imageSrc, alternateText, imageAttributes ).ToString();
string content = string.IsNullOrWhiteSpace( linkText ) ? image : image + linkText;
sb.AppendFormat( format, href, GetAttributeString( htmlAttributes ), content );
return sb.ToString();
}
// controller/action image link
public static string ActionImage( this HtmlHelper helper, string controller, string action, string linkText, object htmlAttributes,
string alternateText, string imageSrc, object imageAttributes )
{
bool isDefaultAction = string.IsNullOrEmpty( action ) || action == "Index";
string href = "/" + (controller ?? "Home") + (isDefaultAction ? string.Empty : "/" + action);
return ActionImage( helper, href, linkText, htmlAttributes, alternateText, imageSrc, imageAttributes );
}
// T4MVC ActionResult image link
public static string ActionImage( this HtmlHelper helper, ActionResult actionResult, string linkText, object htmlAttributes,
string alternateText, string imageSrc, object imageAttributes )
{
var controller = (string) actionResult.GetPropertyValue( "Controller" );
var action = (string) actionResult.GetPropertyValue( "Action" );
return ActionImage( helper, controller, action, linkText, htmlAttributes, alternateText, imageSrc, imageAttributes );
}
#endregion
#region Helpers
private static string GetAttributeString( object htmlAttributes )
{
if( htmlAttributes == null )
{
return string.Empty;
}
const string format = " {0}=\"{1}\"";
var sb = new StringBuilder();
htmlAttributes.GetType().Properties().ForEach( p => sb.AppendFormat( format, p.Name, p.Get( htmlAttributes ) ) );
return sb.ToString();
}
#endregion
}
}
Note that the GetAttributeString method relies on the Fasterflect library to make reflection tasks easier, but you can replace that with regular reflection if you prefer not to take the additional dependency.
The Image helper extension used to be part of MvcContrib but appears to have been removed, most likely because the functionality is now built in to MVC. Regardless, I've included it below for completeness:
public static class ImageExtensions {
public static MvcHtmlString Image(this HtmlHelper helper, string imageRelativeUrl, string alt, object htmlAttributes) {
return Image(helper, imageRelativeUrl, alt, new RouteValueDictionary(htmlAttributes));
}
public static MvcHtmlString Image(this HtmlHelper helper, string imageRelativeUrl, string alt, IDictionary<string, object> htmlAttributes) {
if (String.IsNullOrEmpty(imageRelativeUrl)) {
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "imageRelativeUrl");
}
string imageUrl = UrlHelper.GenerateContentUrl(imageRelativeUrl, helper.ViewContext.HttpContext);
return MvcHtmlString.Create(Image(imageUrl, alt, htmlAttributes).ToString(TagRenderMode.SelfClosing));
}
public static TagBuilder Image(string imageUrl, string alt, IDictionary<string, object> htmlAttributes) {
if (String.IsNullOrEmpty(imageUrl)) {
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "imageUrl");
}
TagBuilder imageTag = new TagBuilder("img");
if (!String.IsNullOrEmpty(imageUrl)) {
imageTag.MergeAttribute("src", imageUrl);
}
if (!String.IsNullOrEmpty(alt)) {
imageTag.MergeAttribute("alt", alt);
}
imageTag.MergeAttributes(htmlAttributes, true);
if (imageTag.Attributes.ContainsKey("alt") && !imageTag.Attributes.ContainsKey("title")) {
imageTag.MergeAttribute("title", (imageTag.Attributes["alt"] ?? "").ToString());
}
return imageTag;
}
}
