connection string in asp.net core library project -

i have asp.net core library project. want add connection string in it. don't have startup class in this. need place connection string , how fetch it?

please suggest.

in dotnet core can manage configuration using json files, 1 in many ways configure application.

according dotnet core configuration documentation can (copied link reference)

using microsoft.extensions.configuration; using system; using system.io;  // add nuget <package id="microsoft.extensions.configuration" , // <package id="microsoft.extensions.configuration.json" // .net framework 4.x use following path: //.setbasepath(path.combine(directory.getcurrentdirectory(), @"..\.."))  public class program {     static public iconfigurationroot configuration { get; set; }     public static void main(string[] args = null)     {         var builder = new configurationbuilder()             .setbasepath(directory.getcurrentdirectory())             .addjsonfile("appsettings.json");          configuration = builder.build();          console.writeline($"option1 = {configuration["option1"]}");         console.writeline($"option2 = {configuration["option2"]}");         console.writeline(             $"option1 = {configuration["subsection:suboption1"]}");     } } 

then in appsettings.json file can add:

{     "connectionstrings": {         "bloggingdatabase": "server=(localdb)\\mssqllocaldb;database=efgetstarted.consoleapp.newdb;trusted_connection=true;"     }, } 

and access in code using configuration.getconnectionstring("bloggingdatabase")

i can recommend reading dotnet core documentation regarding connection strings

edit: commentors mention on post, don't add connection strings , config files library code - console application or web application!

additional forms of configuration dotnet core includes user secrets, environment variables , perhaps xml files or other forms of storage, pointed out in comments