ASP.NET _ViewStart.cshtml-获取请求 [英] ASP.NET _ViewStart.cshtml - Getting the Request

问题描述

我有一个ASP.NET应用程序.我的应用程序具有_ViewStart.cshtml文件.该文件如下所示:

I have an ASP.NET app. My app has a _ViewStart.cshtml file. That file looks like this:

@using MyCompany.MyApp;
@{
  Layout = "/Views/Shared/_Layout.cshtml";

  var p = HttpContext.Current.Request.QueryString["parameter"];
  ViewBag.QSParameter = p;
}

执行此代码时，出现以下错误:

When I execute this code, I get the following error:

The name 'HttpContext' does not exist in the current context

我不明白._ViewStart.cshtml是否不是视图的外壳"?我试图弄清楚如何全局读取查询字符串参数并为每个请求在ViewBag上设置一个值.我以为这是做到这一点的方法.

I don't understand. Isn't _ViewStart.cshtml kind of the "shell" for the views? I'm trying to figure out how to globally read a query string parameter and set a value on the ViewBag for each request. I thought this would be the way to do it.

谢谢

推荐答案

要从 _ViewStart.cshtml 检索它，可以使用:

To retrieve it from _ViewStart.cshtml, you can use:

ViewBag.QSParameter = Context.Request.Query["parameter"];

注意:现在使用 Query (通过ASP.NET 5中的 QueryString )

但是，我可能会选择走一条不同的路线，并利用 IResultFilter :

However, I might ellect to go a different route and take advantage of IResultFilter:

public class QSParameterFilter : IResultFilter
{
  public void OnResultExecuting(ResultExecutingContext context)
  {
    var QSParameter = context.HttpContext.Request.Query["parameter"];
    ((Controller)context.Controller).ViewBag.QSParameter = QSParameter;
  }
  public void OnResultExecuted(ResultExecutedContext context) { }
}

然后，在您的Startup.cs中注册它:

Then, register it within your Startup.cs:

services.AddMvc();
services.Configure<MvcOptions>(options => {
  options.Filters.Add(new QSParameterFilter());
});

这篇关于ASP.NET _ViewStart.cshtml-获取请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！