https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#configuration says that:
"ABP can use IConnectionStringResolver to determine it. This behaviour can be changed and the connection string can be determined dynamically."
I never try it, but i think you should try it before them https://support.aspnetzero.com/QA/Questions/7386#answer-266967fa-ea7f-b56e-03ee-39ef3b733097
I don't have an example project but documents has all of them. see: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core
creating db context: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#dbcontext configuring db context: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#configuration creating custom repositories from db context: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#custom-repositories
What is an error ? Can you please share more information. Error message or screnshot.
You can create db context for each custom repository if you have a few connection string.
Steps: Create dbcontext and then configure them with their connection strings.
see: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core?searchKey=DbContext%20#configuration
Then create custom repositories for them
you can create custom repository. see:https://aspnetboilerplate.com/Pages/Documents/EntityFramework-Integration#custom-repositories
We don't have such an integrated by default.
you want Hangfire to work with tenant databases?
Search localhost in all solution, change necessary urls. Count depends on what you are using.
Did you add your registerer to IocManager? see : https://github.com/aspnetboilerplate/aspnetboilerplate/blob/f4b34279b743319d922a02a2246a1af9b7255886/src/Abp/AbpKernelModule.cs#L45
can you connect that sql server with using ssms or one of visual studio sql server extension? That server may only accept Windows Authentication mode.