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_Layout.cshtml ASP.NET Core MVC Web应用程序中确定和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IHostingEnvironment通过执行
@inject Microsoft.AspNetCore.Hosting.IHostingEnvironment hostingEnv
操作在视图中注入服务@hostingEnv.EnvironmentName

Answer 2

从.NET Core 3.1开始推荐使用

@inject Microsoft.AspNetCore.Hosting.IWebHostEnvironment hostingEnv

将其添加到 Razor 视图的顶部。您可以使用@hostingEnv.EnvironmentName来获取当前环境。

Answer 3

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);
    }

然后我跑去/api/debug/environment看看价值.

Answer 4

.net core 2.2中的以下工作：

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

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

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