ActionResult返回的空属性缺失

如何解决ActionResult返回的空属性缺失

我的控制器操作方法如下：

public virtual async Task<ActionResult<Customer>> GetCustomerAddress(int CustomerId)
{
    customer =  await scope.ServiceProvider
                           .GetrequiredService<CustomerClient>()
                           .GetCustomerAddressAsyn(CustomerId);

    Ok(Customer);
}

客户模型对象如下：

public class Customer
{
     public int CustomerID { get; set; }
     public string CustomerName { get; set; }
     public string CustomerLastName { get; set; }
     public string CustomerMiddleName { get; set; }
}

CustomerMiddleName值存储在此变量时为空。

Customer customer =  await scope.ServiceProvider
                                .GetrequiredService<CustomerClient>()
                                .GetCustomerAddressAsyn(CustomerId);

但是这样做

return Ok(Customer); 

邮递员测试的Json响应中缺少CustomerMiddleName属性本身。无法理解为什么会这样。由OkObjectResult

返回时，此处缺少空值属性