Cannot set Configuration from JSON appsettings file in .NET Core project

Question

Since there's no ConfigurationManager class in .NET Core, now I have to set config in appsettings.json instead web.config

According to this blog post I have to set my configuration there, so I did like this:

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },

  "Conexion": {
    "name" : "empresas",
    "connectionString": "Data Source=empresas;Initial Catalog=CATALMA; Integrated Security=True;",
    "providerName": "System.Data.SqlClient"
  }
}

I just writed that "Conexion".

Now I created in a ViewModels folder the following class:

public class ConexionConfig 
    {
       public string name { get; set; }
        public string connectionString { get; set; }
        public string providerName { get; set; }
    }

Now, In Startup.cs, in the ConfigureServices method, I have to add it by:

public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.Configure<ConexionConfig>(Configuration.GetSection("Conexion"));
            services.AddMvc();
        }

But unfortunately, I get the following error:

Argument 2: cannot convert from 
     'Microsoft.Extensions.Configuration.IConfigurationSection' to
     'System.Action<ConexionConfig>'

What am I missing?

Hello, did you ever find a solution to this? I've got exactly the same issue. — AndyM
– AndyM, Commented Dec 7, 2016 at 8:54
Yes I did, but I change appsettings.json content to match an example that I see somewhere else. — Mr_LinDowsMac
– Mr_LinDowsMac, Commented Dec 8, 2016 at 15:45

Sarel Esterhuizen · Accepted Answer · 2016-12-29 10:28:01Z

72

Firstly, you need to add the following nuget package to your ASP Core Project.

Microsoft.Extensions.Options.ConfigurationExtensions

The extension methods contained in the package will allow you to configure the strongly typed configuration the way you originally wanted to do it.

services.Configure<ConexionConfig>(Configuration.GetSection("Conexion"));

Alternatively, you could use the binder directly like another answer in this thread suggests without important the previous package but rather:

Microsoft.Extensions.Configuration.Binder

This means that you would have to explicitly enable the options on the pipeline, and bind the action. That is:

services.AddOptions();
services.Configure<ConexionConfig>(x => Configuration.GetSection("Conexion").Bind(x));

answered Dec 29, 2016 at 10:28

Sarel Esterhuizen

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5 Comments

Arghya C Over a year ago

This answer is helpful. Just a note, with ASP.NET Core 2.0, that additional NuGet is not required.

Jeremy Thompson Over a year ago

@ArghyaC - something must have changed in the library dependencies because I've found you do need the NuGet package. ASP.Net Core 2.1

Gene S Over a year ago

This should be marked as the correct answer because this worked for me. I'm using .NET Core 2.2. Used the first answer not the alternative.

smyk Over a year ago

Got to this issue after upgrade of .NET Core from 2.2 to 3.1. This solved the problem for me.

Ciprian Jijie Over a year ago

I installed Install-Package Microsoft.Extensions.Options.ConfigurationExtensions -Version 3.1.2 and works perfectly

peco · Accepted Answer · 2016-07-22 07:22:35Z

8

Try installing the nuget package Microsoft.Extensions.Configuration.Binder and use it´s Bind method:

 services.Configure<ConexionConfig>(x => Configuration.GetSection("Conexion").Bind(x));

You also have to install the options package Microsoft.Extensions.Options and add support for it if you want to inject your options class:

public void ConfigureServices(IServiceCollection services)
{
    services.AddOptions();
    //..
}

Now you can inject IOptions<ConexionConfig> in your controllers and views.

answered Jul 22, 2016 at 7:22

peco

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1 Comment

Sarel Esterhuizen Over a year ago

This would work you are right, but if one wanted to configure it in the same way many tutorials illustrate the problem then one only needs to add the correct package. See my answer...

Mr_LinDowsMac · Accepted Answer · 2016-12-08 15:55:14Z

0

I based on a example somewhere else. Changed appsettings.json to something like this:

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "Data": {
    "DefaultConnection": {
      "ConnectionString": "Data Source=myserver\\sql08;Initial Catalog=enterprises;User id=userAPP;Password=mypassword;"
    }
  }
}

ConexionConfig class changed to this:

 public class ConexionConfig
        {

        public string ConnectionString { get; set; }

    }
}

Then In Startup.cs

...
public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddMvc();
            services.Configure<ConexionConfig>(Configuration.GetSection("Data:DefaultConnection"));
        }
...

Is important to include using Microsoft.Extensions.Configuration in this file.

answered Dec 8, 2016 at 15:55

Mr_LinDowsMac

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1 Comment

Sarel Esterhuizen Over a year ago

I think the only difference between your original question and this answer is that you added the correct package along the way. See my answer...

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