asp.net-mvc – 如何使用图像呈现动作链接？

/*
     * Image Link HTML helper
     */

    /// <summary>
    /// return image link
    /// </summary>
    /// <param name="helper"></param>
    /// <param name="imageUrl">URL for image</param>
    /// <param name="controller">target controller name</param>
    /// <param name="action">target action name</param>
    /// <param name="linkText">anchor text</param>
    public static string ImageLink(this HtmlHelper helper,string imageUrl,string controller,string action,string linkText)
    {
        return ImageLink(helper,null,controller,action,linkText,imageUrl,null);
    }

    /// <summary>
    /// return image link
    /// </summary>
    /// <param name="helper"></param>
    /// <param name="imageUrl">URL for image</param>
    /// <param name="controller">target controller name</param>
    /// <param name="action">target action name</param>
    /// <param name="linkText">anchor text</param>
    /// <param name="htmlAttributes">anchor attributes</param>
    public static string ImageLink(this HtmlHelper helper,string linkText,object htmlAttributes)
    {
        return ImageLink(helper,new RouteValueDictionary(htmlAttributes),null);
    }

    /// <summary>
    /// return image link
    /// </summary>
    /// <param name="helper"></param>
    /// <param name="imageUrl">URL for image</param>
    /// <param name="controller">target controller name</param>
    /// <param name="action">target action name</param>
    /// <param name="linkText">anchor text</param>
    /// <param name="htmlAttributes">anchor attributes</param>
    /// <param name="routeValues">route values</param>
    public static string ImageLink(this HtmlHelper helper,object htmlAttributes,object routeValues)
    {
        return ImageLink(helper,new RouteValueDictionary(routeValues));
    }

    /// <summary>
    /// return image link
    /// </summary>
    /// <param name="helper"></param>
    /// <param name="id">Id of link control</param>
    /// <param name="controller">target controller name</param>
    /// <param name="action">target action name</param>
    /// <param name="strOthers">other URL parts like querystring,etc</param>
    /// <param name="strImageURL">URL for image</param>
    /// <param name="alternateText">Alternate Text for the image</param>
    /// <param name="strStyle">style of the image like border properties,etc</param>
    /// <returns></returns>
    public static string ImageLink(this HtmlHelper helper,string id,string strImageURL,string alternateText,string strStyle)
    {
        return ImageLink(helper,id,strImageURL,alternateText,strStyle,null);
    }

    /// <summary>
    /// return image link
    /// </summary>
    /// <param name="helper"></param>
    /// <param name="id">Id of link control</param>
    /// <param name="controller">target controller name</param>
    /// <param name="action">target action name</param>
    /// <param name="linkText">anchor text</param>
    /// <param name="strImageURL">URL for image</param>
    /// <param name="alternateText">Alternate Text for the image</param>
    /// <param name="strStyle">style of the image like border properties,etc</param>
    /// <param name="htmlAttributes">html attribues for link</param>
    /// <returns></returns>
    public static string ImageLink(this HtmlHelper helper,string strStyle,IDictionary<string,object> htmlAttributes,RouteValueDictionary routeValues)
    {
        // Build the img tag
        TagBuilder image = new TagBuilder("img");
        image.MergeAttribute("src",strImageURL);
        image.MergeAttribute("alt",alternateText);
        image.MergeAttribute("valign","middle");
        image.MergeAttribute("border","none");

        TagBuilder span = new TagBuilder("span");

        // Create tag builder
        var anchor = new TagBuilder("a");
        var url = new UrlHelper(helper.ViewContext.RequestContext).Action(action,routeValues);

        // Create valid id
        anchor.GenerateId(id);

        // Add attributes
        //anchor.MergeAttribute("href","/" + controller + "/" + action); //form target URL
        anchor.MergeAttribute("href",url);
        anchor.MergeAttribute("class","actionImage");
        if (htmlAttributes != null)
            anchor.MergeAttributes(new RouteValueDictionary(htmlAttributes));

        // place the img tag inside the anchor tag.
        if (String.IsNullOrEmpty(linkText))
        {
            anchor.InnerHtml = image.ToString(TagRenderMode.Normal);
        }
        else
        {
            span.InnerHtml = linkText;
            anchor.InnerHtml = image.ToString(TagRenderMode.Normal) + " " + span.ToString(TagRenderMode.Normal);
        }

        // Render tag
        return anchor.ToString(TagRenderMode.Normal); //to add </a> as end tag
    }