在视图中确定ASP.NET Core环境名称

Question

新的ASP.NET Core框架使我们能够为不同的环境执行不同的html：

<environment names="Development">
    <link rel="stylesheet" href="~/lib/material-design-lite/material.css" />
    <link rel="stylesheet" href="~/css/site.css" />
</environment>
<environment names="Staging,Production">
    <link rel="stylesheet" href="https://ajax.aspnetcdn.com/ajax/bootstrap/3.0.0/css/bootstrap.min.css"
          asp-fallback-href="~/lib/material-design-lite/material.min.css"
          asp-fallback-test-class="hidden" asp-fallback-test-property="visibility" asp-fallback-test-value="hidden"/>
    <link rel="stylesheet" href="~/css/site.css" asp-append-version="true"/>
</environment>

但是，如何在ASP.NET Core MVC Web应用程序的_Layout.cshtml中确定并可视化当前环境的名称？

例如，我想将环境名称（Production，Staging，Dev）可视化为HTML注释，以便进行调试：

<!-- Environment name: @......... -->

Answer 1

您可以通过执行操作在视图中注入服务IHostingEnvironment @inject Microsoft.AspNetCore.Hosting.IHostingEnvironment hostingEnv 并做一个@hostingEnv.EnvironmentName

Answer 2

为了验证我刚刚制作了一个简单的API控制器

[Route("api/[controller]")]
public class DebugController : Controller
{
    private IHostingEnvironment _hostingEnv;

    public DebugController(IHostingEnvironment hostingEnv)
    {
        _hostingEnv = hostingEnv;
    }

    [HttpGet("environment")]
    public IActionResult Environment()
    {
        return Ok(_hostingEnv.EnvironmentName);
    }

然后我只是运行/api/debug/environment来查看值。

Answer 3

以下工作在.net核心2.2中：

@inject Microsoft.AspNetCore.Hosting.IHostingEnvironment env
@using Microsoft.AspNetCore.Hosting 

if (env.IsProduction())
{
   //You can also use:

   //env.IsStaging();
   //env.IsDevelopment();
   //env.IsEnvironment("EnvironmentName");
}