C# .NET5.0 launchSettings.json

{
  "$schema": "http://json.schemastore.org/launchsettings.json",
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:32462",
      "sslPort": 44348
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "swagger",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "WebApplication1": {
      "commandName": "Project",
      "dotnetRunMessages": "true",
      "launchBrowser": true,
      "launchUrl": "swagger",
      "applicationUrl": "https://localhost:5001;http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

ASPNETCORE_ENVIRONMENT--环境配置方式，默认为开发环境
ASPNETCORE_ENVIRONMENT常见方式三种，也可进行自定义，例如Demo方式...

//env.IsDevelopment 开发环境
//env.IsProduction 生成环境
//env.IsStaging 预览
//env.IsEnvironment（demo） 可理解为自定义方式

"ASPNETCORE_ENVIRONMENT": "Development"
注：默认启动Startup.cs中
public void ConfigureServices(IServiceCollection services)

如果将"ASPNETCORE_ENVIRONMENT": "Demo"
则启动——约定方式哦
public void ConfigureDemoServices(IServiceCollection services)

如下所示：

 注：如果找不到对应的ConfigureDemoServices，则启动ConfigureServices