c# - Access App key data from class libraries in .NET Core / ASP.NET Core -


to access app keys in class library, need following code in every class library , class need access appkey?

public static iconfigurationroot configuration = new configurationbuilder().addjsonfile("appsettings.json").build();

this found in microsoft docs, looks redundant.

startup class in project below

 public class startup     {         public iconfigurationroot configuration { get; set; }          public startup()         {             var builder = new configurationbuilder()                 .addjsonfile("appsettings.json");              configuration = builder.build();         }          public void configureservices(iservicecollection services)         {             services.addentityframework().addentityframeworksqlserver()                 .adddbcontext<dbcontext>(options =>                     options.usesqlserver(configuration["data:mydb:connectionstring"]));         }     }

then how should inject "iconfigurationroot" in each class of project. , have repeat startup class in each class library? why not part of .net core framework?

by principle of information hiding in object-oriented programming, classes should not need have access application configuration. main application class should need directly have access information. class libraries should expose properties , methods alter behavior based on whatever criteria callers deem necessary, , application should use configuration set right properties.

for example, datebox shouldn't need know how timezone information stored in application configuration file - needs know has datebox.timezone property can check @ runtime see timezone in.


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