Question

我正在尝试在.net core 2.0应用程序中设置Multiple Environment，请参阅下面的代码。

配置文件（Launch.JSON）

"configurations": [
    {
        "name": ".NET Core Launch (web)",
        "type": "coreclr",
        "request": "launch",
        "preLaunchTask": "build",
        // If you have changed target frameworks, make sure to update the program path.
        "program": "${workspaceRoot}/my.api/bin/Debug/netcoreapp2.0/my.api.dll",
        "args": [],
        "cwd": "${workspaceRoot}/my.api",
        "stopAtEntry": false,
        "requireExactSource": false,
        "internalConsoleOptions": "openOnSessionStart",
        "launchBrowser": {
            "enabled": true,
            "args": "${auto-detect-url}",
            "windows": {
                "command": "cmd.exe",
                "args": "/C start ${auto-detect-url}"
            },
            "osx": {
                "command": "open"
            },
            "linux": {
                "command": "xdg-open"
            }
        },
        "env": {
            "ASPNETCORE_ENVIRONMENT": "Development"
        },
        "sourceFileMap": {
            "/Views": "${workspaceRoot}/Views"
        }
    },
    {
        "name": ".NET Core Attach",
        "type": "coreclr",
        "request": "attach",
        "processId": "${command:pickProcess}"
    }
]

Program.cs的

public class Program
{
    public static void Main(string[] args)
    {
        BuildWebHost(args).Run();
    }

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();
}

StartUp.cs

 public class Startup
{
    public IContainer ApplicationContainer { get; private set; }
    private IHostingEnvironment HostingEnvironment { get; set; }
    public IConfigurationRoot Configuration { get; }
    private string ConnectionString
    {
        get
        {
            return this.HostingEnvironment.IsDevelopment() ? Configuration.GetConnectionString("DefaultConnection") : Configuration.GetConnectionString("Production");
        }
    }
    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()  
            .SetBasePath(env.ContentRootPath)
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            .AddJsonFile($"appsettings.Development.json", optional: true, reloadOnChange: true)
            .AddJsonFile($"appsettings.Azuredev.json", optional: true, reloadOnChange: true)
            .AddEnvironmentVariables();

        Configuration = builder.Build();

        this.HostingEnvironment = env;         

        System.Console.WriteLine(env.EnvironmentName); //here it always give me Production.
    }

我的问题

我尝试使用命令行，如 dotnet run --environment“Development”

因此，它应该在开发环境上运行，但它始终以生产运行，（看起来我在启动时添加了 console.writeline 的.cs）

现在奇怪的是，如果我使用F5进行调试，那么它与开发环境完美匹配。

Answer 1

您可以更新launchsettings.json以包含“开发”配置文件，然后运行：

dotnet run --launch-profile "Development"

有关配置launchSettings.json文件的更多详细信息，请参阅Working with multiple environments

请注意，commandName可能需要是“Project”（我还没有真正尝试过这么多）。示例launchSettings.json如下：

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:19882/",
      "sslPort": 0
    }
  },
  "profiles": {
    "Development": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

Answer 2

最后我做到了..

让我们看看我是如何实现这一目标的。

我在launchSettings.JSON
Program.cs与我在问题中添加的内容相同。
更新了startup.cs（见下文）
通过终端运行它的CLI也不同。

现在先看看我的项目结构。

我的launchSettings.json中的
代码

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:40088/",
      "sslPort": 0
    }
  },
  "profiles": {
    "Development": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "Azuredev": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Azuredev"
      }
    }
  }
}

launch.json中的代码

{     
"version": "0.2.0",
"configurations": [
        {
            "name": ".NET Core Launch (web)",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            // If you have changed target frameworks, make sure to update the program path.
            "program": "${workspaceRoot}/my.api/bin/Debug/netcoreapp2.0/my.api.dll",
            "args": [],
            "cwd": "${workspaceRoot}/my.api",
            "stopAtEntry": false,
            "requireExactSource": false,
            "internalConsoleOptions": "openOnSessionStart",
            "launchBrowser": {
                "enabled": true,
                "args": "${auto-detect-url}",
                "windows": {
                    "command": "cmd.exe",
                    "args": "/C start ${auto-detect-url}"
                },
                "osx": {
                    "command": "open"
                },
                "linux": {
                    "command": "xdg-open"
                }
            },
            "sourceFileMap": {
                "/Views": "${workspaceRoot}/Views"
            }
        },
        {
            "name": ".NET Core Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command:pickProcess}"
        }
    ]
}

startup.cs

    public IConfigurationRoot Configuration { get; }

    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()  
            .SetBasePath(env.ContentRootPath)
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true)
            .AddEnvironmentVariables();

        Configuration = builder.Build();

        this.HostingEnvironment = env;        
    }

在完成所有更改之后，我的API在F5调试选项和CLI终端都正常工作。

要从命令行启动应用程序，请使用此关键字。

dotnet run --launch-profile＆＃34; Development＆＃34;

OR

dotnet run --launch-profile＆＃34; Azuredev＆＃34;

Answer 3

dotnet run --environment对ASPNETCORE_ENVIRONMENT环境变量没有影响，请参阅this issue。

以下是有关如何以多种方式切换环境的详细说明：https://docs.microsoft.com/en-us/aspnet/core/fundamentals/environments

例如，您可以从命令行（dotnet run之前）运行它：set ASPNETCORE_ENVIRONMENT=Development

Answer 4

您可以在命令终端中使用以下命令设置环境。

setx ASPNETCORE_ENVIRONMENT "Environment_Name"

环境名称可以是开发，分期或生产

请注意，当前打开的窗口中未设置环境变量。您需要打开一个新的命令提示符以查看更新的环境。如果打开管理命令提示符并添加/ M开关，也可以设置系统变量（而不仅仅是用户变量）

For reference

Answer 5

对于.NET Core 3.1，您需要添加：

.AddCommandLine(args)

访问Program.cs中的ConfigurationBuilder

为

dotnet run --environment "Development"

正常工作（切换ASP.NET Core环境）。

Answer 6

打开Powershell，到达项目位置

首先使用命令设置环境变量

$Env:ASPNETCORE_ENVIRONMENT = "Qa"

从电源外壳运行应用程序 dotnet run --no-launch-profile

在.net Core 2.0中设置环境变量

6 个答案: