要在控制器中自动展开类型的属性，可以使用OData的AutoExpand属性。以下是一个示例控制器：

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.OData.Query;
using Microsoft.AspNetCore.OData.Query.Attributes;
using System.Collections.Generic;

namespace ODataAutoExpandExample.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class UsersController : ControllerBase
    {
        private readonly List _users = new List
        {
            new User { Id = 1, Name = "John Doe", Email = "johndoe@example.com", Address = new Address { Country = "USA", City = "New York"} },
            new User { Id = 2, Name = "Jane Doe", Email = "janedoe@example.com", Address = new Address { Country = "USA", City = "Los Angeles"} },
            new User { Id = 3, Name = "Bob Smith", Email = "bobsmith@example.com", Address = new Address { Country = "Australia", City = "Sydney"} },
        };

        [HttpGet]
        [EnableQuery]
        public IEnumerable Get(ODataQueryOptions options)
        {
            options.SelectExpand.AddExpansion("Address");

            var results = options.ApplyTo(_users.AsQueryable());
            return (IEnumerable)results;
        }
    }

    public class User
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Email { get; set; }

        [AutoExpand]
        public Address Address { get; set; }
    }

    public class Address
    {
        public string Country { get; set; }
        public string City { get; set; }
    }
}

上述代码中，我们在Address属性前添加了AutoExpand属性，表示当使用OData查询时，这个属性会自动展开。然后，在控制器的Get方法中，我们添加了一个SelectExpand额外展开Address属性的选项。这样，当我们调用/users API时，返回的数据中即包含users的基本信息，也包括他们的地址信息。