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"