你如何在 asp.net mvc 中使用显示“岛"的用户控件?数据的?

问题描述

我正在尝试找出如何在 asp.net mvc 中使用用户控件.我知道如何将用户控件添加到视图以及如何将数据传递给它.我一直无法弄清楚的是，您如何在不必在每个控制器中检索和传递数据的情况下执行此操作?

例如，如果我有一个用户控件在站点中的几个页面而不是所有页面上显示最近的帖子，我如何编写控制器以便我获取该用户控件的数据并将其传递给用户控件仅从网站中的一个位置，而不是在使用用户控件的每个不同控制器中获取和传递数据?

我不确定这是否有意义.是否有更好或推荐的方法来处理要在多个页面上显示的数据孤岛"?

我来自网络表单，我可以在其中编写一个用户控件，该控件获取自己的数据并独立于使用它的任何页面的其余部分显示数据.

解决方案

有多种方法可以做到.

基本方法是

• 为 BaseController 中的视图填充数据(OnActionExecuting 事件)
• 编写自定义操作过滤器
• 编写应用程序控制器(例如在下面的链接中).

OnActionExecuting 的一个例子是

 [处理错误]公共类 BaseController :控制器{CourseService cs = new CourseService();protected override void OnActionExecuting(ActionExecutingContext filterContext){列表标签 = cs.GetTags();ViewData["标签"] = 标签；}}

您可以在任何视图上使用标签"视图数据.这只是将用户控件呈现为副内容的示例.

<asp:ContentPlaceHolder ID="ContentReferenceB" runat="server" ><% Html.RenderPartial("标签");％＞</asp:ContentPlaceHolder>

我发现以下网址很有用.

http://weblogs.asp.net/stephenwalther/archive/2008/08/12/asp-net-mvc-tip-31-passing-data-to-master-pages-and-user-controls.aspx

http://blog.matthidinger.com/2008/02/21/ASPNETMVCUserControlsStartToFinish.aspx

http://www.aaronlerch.com/blog/2008/01/26/displaying-foo-on-every-page-of-an-aspnet-mvc-application/

http://blog.wekeroad.com/2008/01/07/aspnet-mvc-using-usercontrols-usefully/

I am trying to find out how to use usercontrols in asp.net mvc. I know how to add a usercontrol to a view and how to pass data to it. What I haven't been able to figure out is how do you do this without having to retrieve and pass the data in every single controller?

For example, if I have a user control that displays the most recent posts on several but not all the pages in the site, how do I write the Controllers so that I get data for that usercontrol and pass it to the user control from only one place in the web site instead of getting and passing data in each of the different controllers that the user control is used in?

I'm not sure if this makes sense or not. Is there a better or recommended way to handle an "island" of data that you want to display on several pages?

I'm coming from web forms where I could just write a user control that got its own data and displayed data independently from the rest of whatever page it is used on.

解决方案

There are multiple ways to do it.

The basic approach is

• Populate the data for the view in the BaseController (OnActionExecuting event)
• Writing a custom action filter
• Writing an Application Controller (the eg. is in the below links).

An example of OnActionExecuting will be

   [HandleError]
    public class BaseController : Controller
    {
        CourseService cs = new CourseService();
        protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            List<Tag> tags = cs.GetTags();
            ViewData["Tags"] = tags;
        }

    }

You can use the "tags" view data on any view. This is just an example of usercontrol being rendered as side content.

<div id="sidebar_b">
         <asp:ContentPlaceHolder ID="ContentReferenceB" runat="server" >
             <% Html.RenderPartial("Tags"); %>
         </asp:ContentPlaceHolder>
   </div>

I found the following URL to be useful.

http://weblogs.asp.net/stephenwalther/archive/2008/08/12/asp-net-mvc-tip-31-passing-data-to-master-pages-and-user-controls.aspx

http://blog.matthidinger.com/2008/02/21/ASPNETMVCUserControlsStartToFinish.aspx

http://www.aaronlerch.com/blog/2008/01/26/displaying-foo-on-every-page-of-an-aspnet-mvc-application/

http://blog.wekeroad.com/2008/01/07/aspnet-mvc-using-usercontrols-usefully/

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