使用TagBuilder和ASP.NET MVC 4（使用Razor引擎）呈现html代码

Question

我想使用TagBuilder呈现li项。

我的功能

public static string RenderListTag(this HtmlHelper helper, string labelText, string action, string controller, bool isAdmin, string listCssClass = "") 
     { 
      string value = string.Empty; 

      TagBuilder li = new TagBuilder("li"); 
      TagBuilder anchor = new TagBuilder("a"); 
      UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext); 

      if (string.IsNullOrEmpty(action) || string.IsNullOrEmpty(controller)) 
      { 
       anchor.MergeAttribute("href", "#"); 
      } 
      else 
      { 
       anchor.MergeAttribute("href", urlHelper.Action(action, controller, new 
       { 
        area = isAdmin ? "Admin" : "" 
       })); 
      } 

      anchor.SetInnerText(labelText); 

      if (action.IsEqualWith(helper.ViewContext.RouteData.Values["action"].ToString())) 
      { 
       li.MergeAttribute("class", "active"); 
      } 

      if (!string.IsNullOrEmpty(listCssClass)) 
      { 
       li.MergeAttribute("class", listCssClass); 
      } 

      li.SetInnerText(anchor.ToString(TagRenderMode.Normal)); 

      return li.ToString(TagRenderMode.Normal); 
     } 

当我打电话使用下面的代码：

@Html.RenderListTag("Home", "Index", "Contents", false) 
@Html.RenderListTag("About", "About", "Home", false) 
@Html.RenderListTag("Contact", "Contact", "Home", false) 
@Html.RenderListTag("Show toolbar", "", "", false, "options no-display") 
@Html.RenderListTag("CMS", "Index", "Home", true) 

结果打印为文本而不是HTML标签。

<li class="active">&lt;a href=&quot;/Contents&quot;&gt;Home&lt;/a&gt;</li> <li>&lt;a href=&quot;/Home/About&quot;&gt;About&lt;/a&gt;</li> <li>&lt;a href=&quot;/Home/Contact&quot;&gt;Contact&lt;/a&gt;</li> <li class="options no-display">&lt;a href=&quot;#&quot;&gt;Show toolbar&lt;/a&gt;</li> <li class="active">&lt;a href=&quot;/Admin/Home&quot;&gt;CMS&lt;/a&gt;</li> 

我想打印HTML标记而不是文本。

我的错误在哪里？

Answer 1

使用@Html.Raw(Html.RenderListTag("CMS", "Index", "Home", true))

Answer 2

尝试改变最后一行：

return helper.Raw(li.ToString(TagRenderMode.Normal)).ToHtmlString();

Answer 3

，我发现我的错误:)

我用

li.SetInnerText(anchor.ToString(TagRenderMode.Normal)); 

正确的方法是

li.InnerHtml = anchor.ToString(TagRenderMode.Normal); 

我改变了我的函数的类型从string到MvcHtmlString，如：

public static MvcHtmlString RenderListTag(this HtmlHelper helper, string labelText, string action, string controller, bool isAdmin, string listCssClass = "") 

和函数的返回是：

return MvcHtmlString.Create(li.ToString()); 

现在，工作。

Answer 4

对于这样的情况，我在HttpUtility类的静态方法HtmlDecode中有一个好朋友。尝试：返回MvcHtmlString.Create（HttpUtility.HtmlDecode（li.ToString（TagRenderMode.Normal）））;

HTH

Answer 5

必须从方法

public static MvcHtmlString RenderListTag(this HtmlHelper helper, string labelText, string action, string controller, bool isAdmin, string listCssClass = "") 
{ 
    string value = string.Empty; 

    TagBuilder li = new TagBuilder("li"); 
    TagBuilder anchor = new TagBuilder("a"); 
    UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext); 

    if (string.IsNullOrEmpty(action) || string.IsNullOrEmpty(controller)) 
    { 
     anchor.MergeAttribute("href", "#"); 
    } 
    else 
    { 
     anchor.MergeAttribute("href", urlHelper.Action(action, controller, new 
     { 
      area = isAdmin ? "Admin" : "" 
     })); 
    } 

    anchor.SetInnerText(labelText); 

    if (action.IsEqualWith(helper.ViewContext.RouteData.Values["action"].ToString())) 
    { 
     li.MergeAttribute("class", "active"); 
    } 

    if (!string.IsNullOrEmpty(listCssClass)) 
    { 
     li.MergeAttribute("class", listCssClass); 
    } 

    li.SetInnerText(anchor.ToString(TagRenderMode.Normal)); 

    return new MvcHtmlString(li.ToString(TagRenderMode.Normal)); 
}