與MVC

Question

簡單的繼承我有這樣的擴展方法：

public static MvcHtmlString BenefitURL(this HtmlHelper Html 
              , DTOBaseBenefit benefit) 
    { 

     string title = **(benefit is DTOBenefitButtonText)** ? 
         ((DTOBenefitButtonText)benefit).ButtonText : 
         benefit.BenefitTitle; 

     if (string.IsNullOrEmpty(benefit.FileURL)) 
     { 
      return Html.ActionLink(title, 
            "GetBenefit", 
            new { benefitID = benefit.BenefitID }); 
     } 

     var url = new UrlHelper(HttpContext.Current.Request.RequestContext); 
     return Html.ActionLink(benefit.BenefitTitle, 
           url.Content(benefit.FileURL)); 
    } 

在視圖中我有這樣的：

@model IEnumerable<WellfareSystem.Entities.ViewModels.DTOBenefitButtonText> 
. 
. 
. 
    @for (int i = 0; i < Model.Count(); i++) 
    { 
    @Html.BenefitURL(Model.Skip(i).First()) 
    } 

現在：

public class DTOBenefitButtonText : DTOBaseBenefit 
{ 
.... 
} 

**問：在我的分機。方法的轉換檢查（好處是DTOBenefitButtonText）返回FALSE。儘管我將DTOBenefitButtonText傳遞給該方法，但它並不適用。我究竟做錯了什麼？

Answer 1

試試這個：

benefit.GetType() == typeof(DTOBenefitButtonText)