System.ArgumentNullException: 'Value cannot be null. Paramet

Hi 

launchsettings.json is used to define environment like development, staging etc., for each environemnt you can define environment variables. 

 

you can refer this link for more details on how to use launchsetting.json in .net core application. this is applicable for any kind of application including azure

 

https://www.talkingdotnet.com/launchsetting-json-in-aspnet-5/

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-2.2 

I have referred many links in all these references I have not found connection string to be defined in launchSetting.json file

 

https://blog.elmah.io/individual-developer-settings-in-asp-net-core/ 

https://dotnetcore.show/episode-10-configuration-in-net-core/ 

Hi

 

Is this rule applied to Microsoft Azure? 

You need to add connection string in appSetting.json file instead of launchSetting.json file

 

Refer below link for more details

 

https://stackoverflow.com/questions/51605177/net-core-how-can-i-set-the-connection-string

 

https://dzone.com/articles/dynamic-connection-string-in-net-core