无法声明具有不同属性类型的属性

Question

在链接上,我会在程序中向您展示我的所有课程

我的customerframe课堂上有这样的属性:

 public string firstName { get; set; }
 public string lastName { get; set; }
 public CustomerFiles.Phone phone { get; set; }
 public CustomerFiles.Email email { get; set; }
 public CustomerFiles.Address addressinfo { get; set; }
 public string city { get; set; }
 public CustomerFiles.Countries countryinfo { get; set; }
 public string street { get; set; }
 public string zipcode { get; set; }

但我的问题是,当这样做时,我得到指向这4个属性的错误

public CustomerFiles.Phone phone { get; set; }
public CustomerFiles.Email email { get; set; }
public CustomerFiles.Address addressinfo { get; set; }
public CustomerFiles.Countries countryinfo { get; set; }

错误就是这个

不一致的可访问性属性类型比属性更不易访问

在课堂上继续下去,我会做以下事情:

        contact.FirstName = tbFirstName.Text;
        firstName = contact.FirstName;

        contact.LastName = tbLastName.Text;
        lastName = contact.LastName;

        contact.PhoneData = tbCellPhone.Text;
        phone = contact.PhoneData;

        contact.EmailData = tbHomePhone.Text;
        email = contact.EmailData;

        //inside address class
        address.City = tbCity.Text;
        city = address.City;

        address.Country = cbCountry.Text;
       countryinfo = address.Country;

        address.Street = tbStreet.Text;
        street = address.Street;

        address.ZipCode = tbZipCode.Text;
        zipcode = address.ZipCode;

但为什么我的财产有问题？如何解决这个问题才能使其发挥作用？提前致谢

Answer 1

显然,类型CustomerFiles.Phone(或其包含类型CustomerFiles,如果它是类型而不是命名空间)没有可见性public.由于您创建的返回类型的属性是public,因此类型本身也需要public.