我正在使用以下内容生成操作链接:
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
}
}
请注意,GetAttributeString 方法依赖于 Fasterflect 库来简化反射任务,但如果您不想使用额外的依赖项,则可以将其替换为常规反射。
Image helper 扩展曾经是 MvcContrib 的一部分,但似乎已被删除,很可能是因为该功能现在已内置到 MVC 中。无论如何,为了完整起见,我将其包含在下面:
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;
}
}