页面上没有显示Html助手 [英] Html helper is not displaying on the page

问题描述

我在视图中写了以下代码 -

< pre lang =c＃> 
< tr> 
< td> 
<％Html.Label（FromCity）; ％GT; 
 
< / td> 
< td> 
< select id =Select1> 
< option>< / option> 
< / select> 
 
<％Html.DropDownList（City）; ％GT; 
<％ - <％Html.DropDownListFor（ddlCity，新的SelectList（ViewData [City]。ToString（），CityId，CityName））;％>  - ％ > 
 
< / td> 
 
< / tr> 

运行项目时没有显示助手，没有显示错误。显示除助手之外的所有其他HTML控件。

我该怎么办？

解决方案

替换

 ViewData [  城市]。ToString（）

 ViewData [ 城市]  as  IEnumerable< SelectListItem> 

 <％  Html.DropDownListFor（  ddlCity，新 SelectList（ViewData [  City]  as  IEnumerable< SelectListItem>，  CityId，  CityName））; ％>  

请确保使用selectList和data填充viewBag.City

< pre lang =c＃> ViewBag.City = new SelectList（db.Cities， Id， 名称）;

其余的代码是正确的

 <％ Html.DropDownList（  City）; ％GT; 
 

;; - ）

I have written following code in the view -

<pre lang="c#">
    <tr>
              <td>
                <%Html.Label("FromCity"); %>
               
              </td>
              <td>
                  <select id="Select1">
                      <option></option>
                 </select>             

               <%Html.DropDownList("City"); %>
               <%--<%Html.DropDownListFor("ddlCity",new SelectList(ViewData["City"].ToString(),"CityId","CityName"));%>--%>
               
              </td>
             
          </tr>

The helpers are not being displayed when I run the project, no error is displayed. All other HTML controls except helpers are displayed.
What should I do?

解决方案

Replace

ViewData["City"].ToString()

with

ViewData["City"] as IEnumerable <SelectListItem>

<%Html.DropDownListFor("ddlCity",new SelectList(ViewData["City"] as IEnumerable <SelectListItem>,"CityId","CityName"));%>

Please make sure you are filling viewBag.City with selectList and data

ViewBag.City= new SelectList(db.Cities, "Id", "Name");

Rest of your code is correct

<%Html.DropDownList("City"); %>

;;-)

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