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
– Steve Eggering, Commented Mar 16, 2017 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
– koelkastfilosoof, Commented Mar 16, 2017 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
– Steve Eggering, Commented Mar 16, 2017 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
– Ilya Chumakov, Commented Apr 19, 2017 at 21:07

netotz · Accepted Answer · 2023-06-24 16:41:18Z

21

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, 2023 at 16:41

netotz

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answered Apr 19, 2017 at 21:04

Ilya Chumakov

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1 Comment

Steve Eggering Over a year ago

Thank you, this works. And sorry about the screenshots, I will correct that on future posts.

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