团队开发中，开发，测试，预发布，生产，不同的角色工作在不同的环境中，不同的环境有不同的作用(有些公司的环境更多，按照自己的交付流程设计)，当然不同的环境，配置也不能相同，特别生产数据是隔离的。那asp.net core怎么来对应呢？

asp.net core为了支持不同的环境，可以把配置文件分为设置成appsettings.json,appsettings.Staging.json,appsettings.QA.json,appsettings.Development.json，配置文件中，可以放不同的配置项。

常见的不同环境配置项：

1、数据库链接字符串

2、外接存存储

3、三方接口url

4、本服务对外端口

5、区分不同环境的标准信息等

下面是三个环境的appsettings文件

Production：appsettings.json

{"urls": "https://*:5001;http://*:5000","Logging": {"LogLevel": {"Default": "Information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "Information"}},"ConnectionStrings": {"DefaultConnectionString": "server=123.1.1.1;database=ab_db;uid=sa;pwd=!fuzamimi20;"},"AllowedHosts": "*"
}

Staging：appsettings.Staging.json

{"urls": "https://*:7001;http://*:7000","Logging": {"LogLevel": {"Default": "Information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "Information"}},"ConnectionStrings": {"DefaultConnectionString": "server=123.1.1.2;database=ab_db;uid=sa;pwd=sa;"}
}

Development：appsettings.Development.json

{"urls": "https://*:8001;http://*:8000","Logging": {"LogLevel": {"Default": "Information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "Information"}},"ConnectionStrings": {"DefaultConnectionString": "server=123.1.1.4;database=ab_db;uid=sa;pwd=sa;"}
}

Development：appsettings.Development.json

{"urls": "https://*:9001;http://*:9000","Logging": {"LogLevel": {"Default": "Information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "Information"}},"ConnectionStrings": {"DefaultConnectionString": "server=123.1.1.3;database=ab_db;uid=sa;pwd=sa;"}
}

在Visual Studio中，项目属性下，可以查询环境变量

对应UI的配置文件在Properties下的launchSettings.json

{"iisSettings": {"windowsAuthentication": false,"anonymousAuthentication": true,"iisExpress": {"applicationUrl": "http://localhost:55263","sslPort": 44313}},"$schema": "http://json.schemastore.org/launchsettings.json","profiles": {  "AspNetCoreEnvironment": {"commandName": "Project","launchBrowser": true,"launchUrl": "swagger","environmentVariables": {"ASPNETCORE_ENVIRONMENT": "Development"},"dotnetRunMessages": "true","applicationUrl": "https://localhost:9001;http://localhost:9000"}}
}

对于Staging环境，如果使用DevOpt，可以在对应工具中来配置Staging或Production环境变量

Jenkins

配置全局环境变量，来配置对应asp.net core ASPNETCORE_ENVIRONMENT的运行时环境

dockerfile

ENV ASPNETCORE_ENVIRONMENT="Staging"