How to SetBasePath in ConfigurationBuilder in Core 2.0

Question

How can I set the base path in ConfigurationBuilder in Core 2.0.

I have googled and found this question, this from Microsoft docs, and the 2.0 docs online but they seem to be using a version of Microsoft.Extension.Configuration from 1.0.0-beta8.

I want to read appsettings.json. Is there a new way of doing this in Core 2.0?

using System;
using System.IO;
using Microsoft.Extensions.Configuration;
namespace ConsoleApp2
{
    class Program
    {
        public static IConfigurationRoot Configuration { get; set; }

        static void Main(string[] args)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory()) // <== compile failing here
                .AddJsonFile("appsettings.json");

            Configuration = builder.Build();

            Console.WriteLine(Configuration.GetConnectionString("con"));
            Console.WriteLine("Press a key...");
            Console.ReadKey();
        }
    }
}

appsetting.json

{
  "ConnectionStrings": {
    "con": "connection string"
  }
}

UPDATE: In addition to adding Microsoft.Extensions.Configuration.FileExtensions as indicated below by Set I also needed to add Microsoft.Extensions.Configuration.Json to get the AddJsonFile extension.

Answer 1

The SetBasePath extension method is defined in Config.FileExtensions.

You need to add a reference to the Microsoft.Extensions.Configuration.FileExtensions package.

To resolve AddJsonFile, add a reference to the Microsoft.Extensions.Configuration.Json package.

Answer 2

I'm developing a .NET Core 2 console app using Visual Studio 2017 v15.5. As others have noted, after adding Microsoft.Extensions.Configuration I needed to add Microsoft.Extensions.Configuration.Json to get the AddJsonFile() call to work. This also made the SetBasePath() call work; so I did not need to add Configuration.FileExtensions . (My code compiles and runs both with and without it.)

I also had a call to AddEnvironmentVariables(), for which I needed to add Configuration.EnvironmentVariables. My code is as follows:

  var builder = new ConfigurationBuilder()
                    .SetBasePath(Directory.GetCurrentDirectory()) // requires Microsoft.Extensions.Configuration.Json
                    .AddJsonFile("appsettings.json") // requires Microsoft.Extensions.Configuration.Json
                    .AddEnvironmentVariables(); // requires Microsoft.Extensions.Configuration.EnvironmentVariables
  Configuration = builder.Build();

Interestingly, the only using statement I needed was using Microsoft.Extensions.Configuration.

Answer 3

Use both 'Microsoft.Extensions.Configuration' and 'Microsoft.Extensions.Configuration.Json' this will solve the problem.

https://www.nuget.org/packages/Microsoft.Extensions.Configuration/ https://www.nuget.org/packages/Microsoft.Extensions.Configuration.Json/

Here is the sample 'ConnectionFactory'

using System.Data;
using System.Data.SqlClient;
using Microsoft.Extensions.Configuration;
using System.IO;

namespace DataAccess.Infrastructure
{
 public class ConnectionFactory : IConnectionFactory
 {
    public ConnectionFactory()
    {
        var builder = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json");
        Configuration = builder.Build();
    }


    public IConfigurationRoot Configuration { get; }
    public IDbConnection GetConnection
    {
        get
        {
            var connectionString = Configuration.GetConnectionString("DefaultConnection");
            var conn = new SqlConnection(connectionString);
            conn.Open();
            return conn;
        }
    }

    #region IDisposable Support
    private bool disposedValue = false; // To detect redundant calls

    protected virtual void Dispose(bool disposing)
    {
        if (!disposedValue)
        {
            if (disposing)
            {
                // TODO: dispose managed state (managed objects).
            }


            // TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
            // TODO: set large fields to null.

            disposedValue = true;
        }
    }

    // TODO: override a finalizer only if Dispose(bool disposing) above has code to free unmanaged resources.
    // ~ConnectionFactory() {
    //   // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
    //   Dispose(false);
    // }

    // This code added to correctly implement the disposable pattern.
    public void Dispose()
    {
        // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
        Dispose(true);
        // TODO: uncomment the following line if the finalizer is overridden above.
        // GC.SuppressFinalize(this);
    }
    #endregion
} }

Answer 4

After adding reference if you are still unable to get the content of JSON.

Go to in properties of JSON (right-click on JSON file > properties) change "Copy to Output Directory" to "Copy Always"

check screenshot