如何在 ASP.NET MVC 中创建几个单选框？

发布于 2024-07-15 17:39:05 字数 677 浏览 3 评论 0 原文

是的:(简单的问题*脸红*

让我们想象一下我有以下枚举：-

string[] languages = new string[]
                     {
                         "en (uk)", // English (colour)
                         "en (us)", // English (color)
                         "fr", // French
                         "es" // Spanish
                     };

ViewData["Languages"] = languages;
ViewData["UserLanguage"] = "en (uk)";

有了这个，我将如何在视图中显示单选按钮？这是枚举所有内容的唯一方法语言值并渲染RadioBox？

例如

<% foreach(string language in ViewData["Languages"] as string[])
{
  response.write Html.RadioBox(... not sure what to set in here ...)
}%>

。

原文

yeah :( simple question * blush *

Lets imagine i have the following enumeration:-

string[] languages = new string[]
                     {
                         "en (uk)", // English (colour)
                         "en (us)", // English (color)
                         "fr", // French
                         "es" // Spanish
                     };

ViewData["Languages"] = languages;
ViewData["UserLanguage"] = "en (uk)";

Armed with this, how would i display a radio button in the View? Is the only way to do this to enumerate through all the language values and render a RadioBox?

eg. pseduo-code...

<% foreach(string language in ViewData["Languages"] as string[])
{
  response.write Html.RadioBox(... not sure what to set in here ...)
}%>

cheers!

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零度℉ 2024-07-22 17:39:05

快速而肮脏：

<% foreach(string language in ViewData["Languages"] as string[]) { %>
  <%= Html.RadioBox(language,language,language == ViewData["UserLanguage"].ToString()) %>
<% } %>

问题是您在该视图数据中分配了魔术字符串。我要做的是这样的：

创建一个类：UserForm

类用户表单{ 

       IList<字符串>   _语言； 
       字符串_selectedL； 

       public UserForm（IList languages, string selectedLanguage） 
       { 
         _languages = 语言； 
         _selectedL = 选定语言； 
       } 

       IEnumerable;   用户语言{ 
           得到 { 
                从 _languages 中的 l 返回 
                        选择新的SelectedListItem { 
                            文本 = l， 
                            值=l， 
                            选定 = (l == _selectedL) 
                        }; 
           } 
       } 
  }

视图应该是强类型的并且类型为：UserForm
然后你可以像这样渲染它：
```
<%= Html.RadioButtonList("userLanguages",ViewData.Model.UserLanguages) %> 
  
```

从控制器你会：

return View(new UserForm(listOfLanguages, selectedLanguage));

HTH。

编辑：
好的，找到了 - RadioButtonList 是 Microsoft.Web.Mvc 命名空间（MVCFutures 项目）中的一个扩展方法 - 您可以从这里获取它：MVCFutures

Quick and dirty:

<% foreach(string language in ViewData["Languages"] as string[]) { %>
  <%= Html.RadioBox(language,language,language == ViewData["UserLanguage"].ToString()) %>
<% } %>

The problem is that you have allot of magic strings in that viewdata. What I would do is something like this:

Create a class: UserForm

class UserForm {

     IList<string> _languages;
     string _selectedL;

     public UserForm (IList<string> languages, string selectedLanguage)
     {
       _languages = languages;
       _selectedL = selectedLanguage;
     }

     IEnumerable<SelectedListItem> UserLanguages {
         get {
              return from l in _languages
                      select new SelectedListItem {
                          Text = l,
                          Value = l,
                          Selected = (l == _selectedL)
                      };
         }
     }
}

the view should be strongly typed and be of type : UserForm
then you could render it like :
```
<%= Html.RadioButtonList("userLanguages",ViewData.Model.UserLanguages) %>
```

From the controller you would :

return View(new UserForm(listOfLanguages, selectedLanguage));

HTH.

EDIT:
OK, found it - the RadioButtonList is an extension method in the Microsoft.Web.Mvc namespace (the MVCFutures project) - you can get it from here : MVCFutures