在ASP.NET MVC中自动切换AMP的视图 [英] Automatically switching views for AMP in ASP.NET MVC

问题描述

我想使用.NET Core 2.0在ASP.NET MVC中创建我的网站的AMP版本.以前，我过去曾在.Net框架上对DisplayModeProvider实例进行过一些工作，但这在.NET Core中似乎不是一个选择.

I want to create and AMP version of my website in ASP.NET MVC using .NET Core 2.0. Previously I had done some work with DisplayModeProvider instances in tha past on .Net framework, but that does not seem to be an option in .NET Core.

我想做的是，当我的URL从/amp开始时，将视图名称更改为index.amp.cshtml而不是index.cshtml.在.NET Core中实现此目标的最佳方法是什么?

What I want to be able to do is alter the view names to be index.amp.cshtml rather than index.cshtml when my URL starts iwth /amp. What's the best way to achieve this in .NET Core?

推荐答案

您可以使用IViewLocationExpander执行类似的操作.碰巧的是，几天前我正在玩这个游戏，所以我要准备一些代码示例.如果您创建这样的内容:

You can do something like this using IViewLocationExpander. As it happens, I was playing with this a few days ago so I have some code samples to hand. If you create something like this:

public class AmpViewLocationExpander : IViewLocationExpander
{
    public void PopulateValues(ViewLocationExpanderContext context)
    {
        var contains = context.ActionContext.HttpContext.Request.Query.ContainsKey("amp");
        context.Values.Add("AmpKey", contains.ToString());

        var containsStem = context.ActionContext.HttpContext.Request.Path.StartsWithSegments("/amp");
        context.Values.Add("AmpStem", containsStem.ToString());
    }

    public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
    {
        if (!(context.ActionContext.ActionDescriptor is ControllerActionDescriptor descriptor)) { return viewLocations; }

        if (context.ActionContext.HttpContext.Request.Query.ContainsKey("amp")
            || context.ActionContext.HttpContext.Request.Path.StartsWithSegments("/amp")
        )
        {
            return viewLocations.Select(x => x.Replace("{0}", "{0}.amp"));
        }

        return viewLocations;
    }
}

iViewLocationExpander可以在Microsoft.AspNetCore.Mvc.Razor

然后在Startup.cs中的Configure Services方法中，添加以下内容:

Then in your Configure Services method in Startup.cs, add the following:

  services.Configure<RazorViewEngineOptions>(options =>
        {
            options.ViewLocationExpanders.Add(new AmpViewLocationExtender());
        });

此操作将在URL以/amp开头或查询字符串键为amp的任何时候更新在.cshtml之前插入.amp的每个请求的视图位置.如果您的AMP视图不存在，它可能会爆炸一些，我尚未对其进行全面测试，但这应该可以帮助您入门.

What this will do is update the view locations per request to insert .amp before .cshtml any time the URL either starts with /amp or there is a query string key of amp. If your AMP views don't exist, it might blow-up a little, I've not fully tested it, but it should get you started.

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