How to get ConnectionString in a ClassLibrary?

Question

Connection strings exist in appsettings.json in an ASP.Net MVC Core Project. I also have a Class Library Project in the same solution and there I want to get the connection string of web project, I am unable to find help in official resources, how can I achieve this?

Update: The class library is of .Net 4.6.1, also in the ASP.Net Core Project I am targeting .Net 4.6.1.

Add reference System.Configuration in your Class library project. — Abhay
– Abhay, Commented Dec 27, 2016 at 6:10
Please have a look at Get connection string in class library project in a solution — Abhay
– Abhay, Commented Dec 27, 2016 at 6:21
@Abhay: Don't ignore the tags. Question is about ASP.NET Core, which doesn't support confiugration via web.config anymore. One should use the dependency injection pattern all the way and the IOptions<T>pattern — Tseng
– Tseng, Commented Dec 27, 2016 at 8:22
Possible duplicate of .NET Core get connection string from appsettings.json — Tseng
– Tseng, Commented Dec 27, 2016 at 10:17

Ahmar · Accepted Answer · 2017-01-18 10:22:03Z

2

Register Configuration in Startup.cs

public void ConfigureServices(IServicesCollection services) 
{
     services.AddSingleton(Configuration);
}

Then you can inject it in controller or any other library project class

public HomeController(IConfigurationRoot Configuration)
{
            this.Configuration= Configuration;
}

Then you can get connection string as you get in Startup.cs

Configuration.GetConnectionString("DefaultConnection")

edited Jan 18, 2017 at 10:22

answered Dec 28, 2016 at 12:53

Ahmar

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