Asp.net core 发布未从appsettings.production.json获取连接字符串

我无法使用appsettings.production.json文件中的连接字符串切换到已发布的ASP.net核心应用程序

我已将launchSettings设置为在开发和生产配置文件中使用ASPNETCORE_环境变量。当我切换配置文件并在VisualStudio中运行它们时，我的连接字符串会正确更改

当我在Ubuntu服务器上运行发布的应用程序时，它不会切换。我已在服务器上将ASPNETCORE_环境变量设置为“Production”。我还验证了appSettings.json和appSettings.production.json都存在于应用程序的根目录中

My appsettings.json文件：

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "ConnectionStrings": {
    "DefaultConnection": "server=localhost;user id=root;password=dev;database=testdb;sslmode=none",
  }
}

{
  "ConnectionStrings": {
    "DefaultConnection": "server=localhost;user id=root;password=prod;database=testdb;sslmode=none"
  }
}

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:50824/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "home/index",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "IIS Express (Production)": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "home/index",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Production"
      }
    }
  }
}

我的appsettings.production.json文件：

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "ConnectionStrings": {
    "DefaultConnection": "server=localhost;user id=root;password=dev;database=testdb;sslmode=none",
  }
}

{
  "ConnectionStrings": {
    "DefaultConnection": "server=localhost;user id=root;password=prod;database=testdb;sslmode=none"
  }
}

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:50824/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "home/index",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "IIS Express (Production)": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "home/index",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Production"
      }
    }
  }
}

My launchSettings.json文件：

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "ConnectionStrings": {
    "DefaultConnection": "server=localhost;user id=root;password=dev;database=testdb;sslmode=none",
  }
}

{
  "ConnectionStrings": {
    "DefaultConnection": "server=localhost;user id=root;password=prod;database=testdb;sslmode=none"
  }
}

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:50824/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "home/index",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "IIS Express (Production)": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "home/index",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Production"
      }
    }
  }
}

My Startup.cs：

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);

    if (env.IsEnvironment("Development"))
    {
        // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
        builder.AddApplicationInsightsSettings(developerMode: true);
    }

    builder.AddEnvironmentVariables();
    Configuration = builder.Build();


    Console.WriteLine("Root Path: " + env.ContentRootPath);
    Console.WriteLine("Connection String: " + Configuration.GetConnectionString("DefaultConnection"));
}

我已经提到了这些问题，但运气不好：

事实证明，中的“注意事项”非常重要：

在Windows和macOS上，指定的环境名称为大小写 不敏感的无论您将变量设置为开发还是 发展或发展的结果将是相同的。然而， 默认情况下，Linux是区分大小写的操作系统。环境变量，文件 名称和设置应采用区分大小写的最佳做法

主要是“Linux默认情况下是区分大小写的操作系统”！！！！！哎呀：）

一旦我将环境变量改为“production”而不是“production”，它就工作了

进一步解释：

关键在于理解Startup.cs启动方法中的这行代码：

.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

它用您的环境变量替换{env.EnvironmentName}，因此如果您在linux中操作，它需要与您的文件名完全匹配。在我的例子中是“appSettings.production.json”，所以ASPNETCORE_环境必须是“production”