CODEWITHSUNDEEP
c#asp.net-core-2.0
Bharat
Bharat

Reputation: 6095

Setting environment variables in .NET Core 2.0

I am trying to setting up multiple environments in my .NET Core 2.0 application. See my code below.

Configuration file (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

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.
    }

My issue

I tried to use command line like dotnet run --environment "Development"

So, it should run on Development Environment, but it always runs with Production, (look I have added console.writeline in my startup.cs file)

Now the strange thing is that if I use F5 to Debug then it runs perfectly with the development environment.

Upvotes: 21

Views: 74555

Answers (5)

Gaurav Prabhakar
Gaurav Prabhakar

Reputation: 11

open Powershell , reach to the project location

First Set environment Variable using the command

$Env:ASPNETCORE_ENVIRONMENT = "Qa"

Run application from power shell dotnet run --no-launch-profile

Upvotes: 1

mcemmy
mcemmy

Reputation: 9332

For .NET Core 3.1, it happens that you need to add:

.AddCommandLine(args)

to your ConfigurationBuilder in Program.cs

for

dotnet run --environment "Development"

to work (switch ASP.NET Core environments).

Upvotes: 2

Bharat
Bharat

Reputation: 6095

Finally I have done it...

Let’s look at how I achieved this.

  1. I have added all my profile settings in launchSettings.JSON
  2. Program.cs remains same as I added in my question.
  3. Updated startup.cs (see below)
  4. CLI for run it via terminal is also different.

Now first let's see my project structure.

enter image description here

Code in my launchSettings.json

{
  "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"
      }
    }
  }
}

Code in launch.json

{
"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;
    }

After this all changes, my API is working fine with both the F5 debug option as well as CLI terminal.

To launch the application from the command line, use these keywords:

dotnet run --launch-profile "Development"

OR

dotnet run --launch-profile "Azuredev"

Upvotes: 7

SpruceMoose
SpruceMoose

Reputation: 10320

You can update your launchsettings.json to include a 'Development' profile and then run:

dotnet run --launch-profile "Development"

For further details on configuration of the launchSettings.json file see Working with multiple environments

Note that the commandName would probably need to be "Project" (I haven't really tried this much). Example launchSettings.json as follows:

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

Upvotes: 18

astef
astef

Reputation: 9518

dotnet run --environment makes no effect on ASPNETCORE_ENVIRONMENT environment variable, see this issue.

Here's a detailed instruction on how to switch environments in a multiple ways: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/environments

For example, you can run it from a Command line (before dotnet run): set ASPNETCORE_ENVIRONMENT=Development

Upvotes: 2

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