具有ASP NET CORE和Docker支持的基于环境的连接字符串

Question

I have a ASP.NET Core app with Docker support and following service configuration in the Startup.cs :

        string connectionString = Environment.GetEnvironmentVariable("ORACLE_CONNECTION_STRING");
        services.AddDbContext<BloggingContext>(options => options.UseOracle(connectionString)); 

I set the connection string in the docker-compose.override.yml :

version: '2'

services:
  continuouseverything:
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
      - ORACLE_CONNECTION_STRING=Server=(DESCRIPTION = (ADDRESS = (PROTOCOL=TCP) (HOST=LOCALHOST) (PORT=1521)) (CONNECT_DATA= (SERVER=DEDICATED) (SERVICE_NAME=xe.oracle.docker))); direct=true; User Id=system; Password=oracle; Unicode=true
    ports:
      - "80"

I works fine when I just start the app via Docker. And in Debugger I can see that the connectionString variable got the right connection String.

But when I try to run Add-Migration InitialCreate I get an ArgumentNullException in the Startup when services.AddDbContext() is called because the connectionString variable is null.

How do I accomplish this, that the EnvironmentVariable is set like defined in the docker-compose file?

Answer 1

如果直接从Powershell运行Add-Migration InitialCreate ，则需要首先在Shell中设置环境变量。

$env:ORACLE_CONNECTION_STRING = "connstring goes here"; Add-Migration InitialCreate