ASP.NET Core 2.0阅读:剃须刀页面中的选项 [英] ASP.NET Core 2.0 read: Options in razor page

问题描述

按照本指南，我正在尝试在ASP.NET Core 2.0页面上显示设置值.

Following this guide, I'm trying to show on an ASP.NET Core 2.0 page the settings values.

在startup.cs中，我添加了一些服务:

In startup.cs I added some services:

services.AddLocalization(options => options.ResourcesPath = "Resources");
services.AddOptions();
services.Configure<MyOptions>(Configuration);

此处定义了MyOptions:

where MyOptions is defined here:

namespace WebApplication1
{
    public class OptionsController : Controller
    {
        private readonly SubOptions _SubOptions;

        public OptionsController(IOptions<SubOptions> options)
        {
            _SubOptions = (SubOptions) options;
        }

        public IActionResult Index()
        {
            var RefreshTime = _SubOptions.RefreshTime;
            return Content($"RefreshTime = {RefreshTime}");
        }
    }

    public class MyOptions
    {
        public MyOptions()
        {
            SubOpt = new SubOptions();
        }

        public SubOptions SubOpt { get; set; }
    }

    public class SubOptions
    {
        public SubOptions()
        {
            RefreshTime = 5;
        }

        public int RefreshTime { get; set; }
    }
}

从startup.cs尝试，我可以访问RefreshTime设置.现在，我想直接在cshtml中执行此操作:

Trying from startup.cs I can access to the RefreshTime setting. Now I want to do this directly in cshtml:

@using Microsoft.Extensions.Options
@model MyOptions
@inject IOptions<MyOptions> Options
@page
@model AboutModel
@{
    ViewData["Title"] = "About";
}
<
<h3>@Model.Message</h3>
<br />
<div>
    <h3>Options</h3>
    <h4>Sub Options</h4>
    <p><b>Refresh time</b> @Options.Value.SubOptions.RefreshTime</p>
</div>

该页面无法加载，但在VisualStudio的输出控制台或浏览器之一中都看不到任何错误.

The page doesn't load but I don't see any errors in the output console of VisualStudio nor in the one of the browser.

此外，即使我只是将第一个@using指令放在此处，也删除了所有其他选项，也无法加载页面.

Furthermore the page doesn't load even if I just put there the first @using directive, removing all the other options stuff.

然后我检查是否已安装该软件包，看来是这样:

Then I checked I have that package installed and it seems so:

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.0" PrivateAssets="All" />
    <PackageReference Include="Microsoft.Extensions.Options" Version="2.0.0" />
    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.0.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.0" PrivateAssets="All" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
    <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="2.0.0" />
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
  </ItemGroup>

我还需要做其他事情吗?

Is there something other I need to do?

正如@Niladri指出的，我混合了MVC和Razor页面(我将在此主题上打开一个单独的问题).

As @Niladri pointed out I mixed MVC and Razor pages (I will open a separate question on this topic).

现在，我删除了控制器类，因为剃须刀页面不需要.无论如何，主要的问题是，如果我在任何页面上使用Microsoft.Extensions.Options 添加 @，这将不允许页面加载.

Now I removed the controller class because is not needed for razor pages. Anyway the main problem is that if I add @using Microsoft.Extensions.Options on any page, this doesn't allow the page loading.

但是我看不到任何错误或异常.

But I cannot see any errors or exceptions.

推荐答案

答案是此处:

@page Razor指令使文件成为MVC操作-这意味着它可以处理请求. @page必须是页面上的第一个Razor指令.

因此，解决方案非常简单，只需对指令重新排序:

Hence the solution is extremely simple, just reorder the directives:

@page
@using Microsoft.Extensions.Options
@inject IOptions<MyOptions> Options
@model AboutModel
@{
    ViewData["Title"] = "About";
}
<
<h3>@Model.Message</h3>
<br />
<div>
    <h3>Options</h3>
    <p><b>Refresh time</b> @Options.Value.SubOpt.RefreshTime</p>
</div>

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