如何在 _ViewStart.cshtml 上设置 ViewBag 属性? [英] How do I set ViewBag properties on _ViewStart.cshtml?

问题描述

我有一个特定的 ViewBag 属性，我想在 ViewStart 级别设置它.理想情况下，如有必要，我希望能够在页面基础上覆盖该属性.这可能吗?如果是这样，我如何访问 ViewStart 页面中的 ViewBag 属性?

I have a specific ViewBag property that I would like to set at the ViewStart level. Ideally, I would like to be able to override that property on a page basis, if necessary. Is this possible? If so, how do I access the ViewBag property within a ViewStart page?

推荐答案

有两种方法:

1. 使用 PageData 属性(它更适用于 ASP.NET 网页，很少在 MVC 中使用)

1. Use the PageData property (it's something more applicable to ASP.NET WebPages and seldom used in MVC)

• 设置:

@{
    PageData["message"] = "Hello";
}

检索

Retrieve

<h2>@PageData["message"]</h2>

尝试找到视图实例(代码有点脏，但它确实可以让您直接访问ViewBag/ViewData

Try to find the view instance (the code is a bit dirty, but it does give you access directly to ViewBag/ViewData

• 设置:

@{
    var c = this.ChildPage;
    while (c != null) {
        var vp = c as WebViewPage;
        if (vp != null) {
            vp.ViewBag.Message = "Hello1";
            break;
        }
        c = c.ChildPage;
    }
}

检索:照常

Retrieve: as per usual

<h2>@ViewBag.Message</h2>

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