How to configure nested objects from appsettings.json in .NET Core?

Question

VS2015 Pro, .NET Core, Web Application.

I'm trying to figure out how to get objects out of appsettings, that have nested objects. I can do it with single level objects by creating a POCO with simple types that match the config names. But with more complex objects, it's not working. I'm getting top level objects back, but they are coming back null. Here's what I have so far:

StartUp.ConfigureServices:

appsettings.json:

POCO APIContext:

Using Class:

So I get my three API objects back but they are all null. I don't know enough about the Configuration in Startup.cs to know what it's supposed to look like, but here it is.

@koelkastfilosoof Sorry, I made some changes mid typing of that question. No more errors, but I updated the question to show that my API objects are coming back null. — Steve Eggering, Mar 16 '17 at 15:21
Can you put a breakpoint in the `Configure` method in your `Startup` and check the `IConfiguration`? Verify that all the settings are loaded correctly — koelkastfilosoof, Mar 16 '17 at 16:02
@koelkastfilosoof I added an image of my configuration members, but I'm not sure how it's supposed to look to begin with. — Steve Eggering, Mar 16 '17 at 16:21
Please don't make code screenshots. Use copy-paste and code formatting instead. It is much easier to read and reproduce. — Ilya Chumakov, Apr 19 '17 at 21:07

score 20 · Accepted Answer · edited Jun 24 '23 at 16:41

20

Nested options are supported and successfully deserialized from appsettings.json. However, fields instead of properties break built-in POCO object deserialization. With the properties the problem should disappear:

public API FirstAPI { get; set; }

public string Path { get; set; }

edited Jun 24 '23 at 16:41

netotz

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answered Apr 19 '17 at 21:04

Ilya Chumakov

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Thank you, this works. And sorry about the screenshots, I will correct that on future posts. – Steve Eggering Apr 19 '17 at 21:48

How to configure nested objects from appsettings.json in .NET Core?

1 Answers1