将 ViewUserControl 上的属性绑定到 .NET MVC2 中的本地变量

发布于 2024-10-21 17:55:06 字数 244 浏览 1 评论 0原文

我想做这样的事情，其中 item 是 .aspx 页面中的本地变量：

<p:ProgressBar  runat="server" Progress="<%#item.Completed/item.Total%>" Width="100" />

绑定表达式未检测本地页面级别变量。有没有办法可以使用 RenderPartial 来不完成此任务？

原文

I want to do something like this where item is a local variable in the .aspx page:

<p:ProgressBar  runat="server" Progress="<%#item.Completed/item.Total%>" Width="100" />

the binding expression isn't detecting the local page level variables. Is there a way I can accomplish this wihtout using RenderPartial?

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暮年慕年 2024-10-28 17:55:07

您不应在 ASP.NET MVC 应用程序中使用任何服务器端控件 (runat="server")，因为它们依赖于 ViewState 和 PostBack，而这些概念在 ASP.NET MVC 中已不再存在。唯一的例外是 Webforms 视图引擎使用面板来实现母版页。也没有绑定的概念。

在 ASP.NET MVC 中，您有一个模型、一个控制器和一个视图。控制器填充一些模型并将其传递给要显示的视图。视图本身可以使用 HTML 助手生成简单的标记或包含更复杂场景的其他部分视图。

因此，您从定义一个模型开始：

public class MyViewModel
{
    public double Progress { get; set; }
}

然后您有一个控制器将操纵该视图模型：

public class HomeController: Controller
{
    public ActionResult Index()
    {
        var completed = 5; // get this from somewhere
        var total = 10; // get this from somewhere
        var model = new MyViewModel
        {
            Progress = (1.0 * completed / total)
        }
        return View(model);
    }
}

最后您将拥有该模型的强类型视图，您将在其中显示标记：

<%@ Page 
    Language="C#" 
    MasterPageFile="~/Views/Shared/Site.Master" 
    Inherits="System.Web.Mvc.ViewPage<AppName.Models.MyViewModel>" 
%>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <h2>Progress</h2>
    <div><%= Html.DisplayFor(x = x.Progress)</div>
</asp:Content>

You shouldn't use any server side controls (runat="server") in an ASP.NET MVC application because that they rely on ViewState and PostBack which are notions that no longer exist in ASP.NET MVC. The only exception makes <asp:Content> panels used by the webforms view engine to implement master pages. Also there is no notion of binding.

In ASP.NET MVC you have a model, a controller and a view. The controller populates some model and passes it to the view to be shown. The view itself could use HTML helpers to generate simple markup or include other partial views for more complex scenarios.

So you start with defining a model:

public class MyViewModel
{
    public double Progress { get; set; }
}

then you have a controller which will manipulate this view model:

public class HomeController: Controller
{
    public ActionResult Index()
    {
        var completed = 5; // get this from somewhere
        var total = 10; // get this from somewhere
        var model = new MyViewModel
        {
            Progress = (1.0 * completed / total)
        }
        return View(model);
    }
}

and finally you would have a strongly typed view to this model where you would show the markup:

<%@ Page 
    Language="C#" 
    MasterPageFile="~/Views/Shared/Site.Master" 
    Inherits="System.Web.Mvc.ViewPage<AppName.Models.MyViewModel>" 
%>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <h2>Progress</h2>
    <div><%= Html.DisplayFor(x = x.Progress)</div>
</asp:Content>

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