c# - read connectionstring outside startup from appsetting.json in vNext

Question

I have a project class (Nuget Package). I need to read in a static class without constructor my connections string to MongoDB.

Static Class Method:

        /// <summary>
        /// The default key MongoRepository will look for in the appsettings.json 
        /// </summary>
        private const string DefaultConnectionstringName = "Data:MongoDB:MongoServerSettings";

        /// <summary>
        /// Retrieves the default connectionstring from appsettings.json
        /// </summary>
        /// <returns>Returns the default connectionstring from the App.config or Web.config file.</returns>
        public static string GetDefaultConnectionString()
        {
            var config = new Configuration();
            return config.Get<string>(DefaultConnectionstringName);
        }

I have always null... How can I obtain the value outside the Startup.cs without using DI?

It is possible?

In my old code I could do something like that:

/// <summary>
    /// Retrieves the default connectionstring from the App.config or Web.config file.
    /// </summary>
    /// <returns>Returns the default connectionstring from the App.config or Web.config file.</returns>
    public static string GetDefaultConnectionString()
    {
        return ConfigurationManager.ConnectionStrings[DefaultConnectionstringName].ConnectionString;
    }

Thanks!!

Answer 1

1.ConnectionString in appsetting.json

2. Creating Singleton Instance of Configuration in Startup.cs class

3. Reading Values from Configuration Instance Using Dependency Injection [Constructor injection ]

4. Finally Output