.NET Core AppSettings.json - Get the right class for a derived item

Question

I'm trying to get the parameter from my appsettings.json which is a list of derived classes. The problem is that I don't know how I can retrieve the information and create the object with the good class for each item get.

My appsettings.json is something like this :

"DiagnosticSettings": {
"Diagnostics": [
  {
    "Type": "Connection",
    "Address": "xxx"
  },
  {
    "Type": "DNS",
    "DNSAddress": "www.google.com",
    "IPToCompare": "8.8.8.8"
  },
  {
    "Type": "DNS",
    "DNSAddress": "www.abc.com",
    "IPToCompare": "x.x.x.x"
  }, [...] 
]}

I have a base class :

public class BaseDiagnosticConfig
{
    public string Type { get; set; }
}

And derived classes like :

public class DNSDiagConfig : BaseDiagnosticConfig
{
    public string DNSAddress { get; set; }
    public string IPToCompare { get; set; }
}

I can retrieve the provider which contains the list of items with something like this :

var a = Configuration.GetSection("DiagnosticSettings:Diagnostics");

And I can have the list of base class (but it is not what I want as I lost all the derived classes information) :

var b = Configuration.GetSection("DiagnosticSettings:Diagnostics").Get<List<BaseDiagnosticConfig>>();

So there is a way to get my items which the good class even if I had to check one by one all the items in my appsettings list or I am just doing something impossible/wrong ?

You are paddling against the stream here, what not use a list of class with a property called Type, and a dictionary of attributes? or even make it all just a dictionary with dictionary of attributes — TheGeneral
– TheGeneral, Commented Jun 26, 2020 at 6:20

Vivek Nuna · Accepted Answer · 2020-06-26 06:44:11Z

0

You have to do like this. I am providing you a very simple example, you can use according to your requirement.

"MySettings": {  
    "Email": "[email protected]",   
  }


public class MySettingsModel  
{   
       public string Email { get; set; }  
}

Register it

services.Configure<MySettingsModel>(Configuration.GetSection("MySettings"));

Declare in the class in which you want to read the setting.

private readonly IOptions<MySettingsModel> appSettings; 
public StudentController(IOptions<MySettingsModel> app)  
{  
    appSettings = app;  
}

Read the value

var value = appsettings.Value;

Reference: https://www.c-sharpcorner.com/article/reading-values-from-appsettings-json-in-asp-net-core/

answered Jun 26, 2020 at 6:44

Vivek Nuna

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