Unable to read connection string from app.config

从 src/SQLProvider/Utils.fs 开始，重点查看 getConStringFromConfig 以及读取连接字符串的相关行。按照所附示例中的 docker-compose、restore 和 build 步骤重现该故障。当 provider 能够使用 app.config 中的连接字符串成功连接，而不再要求在源代码中或运行时提供该字符串时，即表示完成。

Description

I'm attempting to specify the connection string to my DB in an app.config file in the root of my project, instead of hardcoding it in source. The type provider throws the following error:

No connection string specified or could not find a connection string with name DefaultConnectionString

I've read through the Utils.fs file, specifically the getConStringFromConfig function. I can see that line 235 reads match config.ConnectionStrings.ConnectionStrings.[connectionStringName]. Not sure if the double ConnectionStrings is intended? That said, I've tried a few variations of nesting in my app.config file with no luck.

Repro steps

1. Download and extract the attached example
2. cd to root directory of example
3. docker-compose up
4. dotnet restore
5. dotnet build

Expected behavior

Successful connection to DB using connection string defined in app.config.

Actual behavior

The compiler throws the following error:

No connection string specified or could not find a connection string with name DefaultConnectionString

Known workarounds

1. Hardcode the connection string in source
2. Provide a connection string at runtime using .GetDataContext connString (though doesn’t help where compilation needs to happen across differing environments)

Related information

• Used database: Postgres
• Operating system: MacOS and Windows 10 (tested on both)
• Branch: master
• .NET Runtime, CoreCLR or Mono Version: assuming CoreCLR - not sure how to be certain?
• Performance information, links to performance testing scripts:

ConnectionStringTest.zip