在.net Core 2.0中设置环境变量

我正在尝试在我的.net核心2.0应用程序中设置多个环境，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中

 public class Program { public static void Main(string[] args) { BuildWebHost(args).Run(); } public static IWebHost BuildWebHost(string[] args) => WebHost.CreateDefaultBuilder(args) .UseStartup() .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，但它始终使用Prodution运行，（看起来我在startup.cs中添加了console.writeline ）

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launchSettings.json文件配置的更多详细信息，请参阅使用多个环境

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。

1. 我在launchSettings.JSON中添加了所有配置文件设置
2. Program.cs与我在问题中添加的相同。
3. 更新了startup.cs（见下文）
4. 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; } 

完成所有更改后，我的API可以正常使用F5调试选项以及CLI终端。

要从命令行启动应用程序，请使用此关键字。

dotnet run –launch-profile“开发”

要么

dotnet run –launch-profile“Azuredev”

Answer 3

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，分段或生产

请注意，未在当前打开的窗口中设置环境变量。 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）

以供参考

Answer 4

dotnet run --environment对ASPNETCORE_ENVIRONMENT环境变量没有影响，请参阅此问题 。

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