How do I design nested classes in a .NET Core API to get to a particular schema?

Designing nested classes in a .NET Core API involves creating a set of classes and structuring them hierarchically to represent a particular schema. This is often done when modeling complex data structures or dealing with nested JSON objects. Below is a guide on how to design nested classes in a .NET Core API:

Assuming you have a JSON schema like the following:

```json
{
  "name": "John Doe",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "Anytown",
    "zipCode": "12345"
  }
}
```

You would design your classes in C# to match this structure. Here's an example:

```csharp
public class Address
{
    public string Street { get; set; }
    public string City { get; set; }
    public string ZipCode { get; set; }
}

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public Address Address { get; set; }
}
```

In this example:

- `Address` is a nested class within the `Person` class.
- The `Person` class has properties `Name`, `Age`, and `Address`. The `Address` property is of type `Address`, which is the nested class.

When working with a .NET Core API, you might use these classes in your controllers or data models. For example:

```csharp
[ApiController]
[Route("api/[controller]")]
public class PersonController : ControllerBase
{
    [HttpGet]
    public ActionResult<Person> GetPerson()
    {
        var person = new Person
        {
            Name = "John Doe",
            Age = 30,
            Address = new Address
            {
                Street = "123 Main St",
                City = "Anytown",
                ZipCode = "12345"
            }
        };

        return Ok(person);
    }
}
```

In this API controller, when you hit the endpoint, it will return a JSON representation of the `Person` class, which includes the nested `Address` class.

Note: It's important to follow good coding practices, such as encapsulation, when designing nested classes. Consider whether you need to expose all properties as public or if some should be private with corresponding methods to access or modify them. Additionally, you may want to add validation, error handling, and other features based on your specific requirements.