c# - 无法声明具有不同属性类型的属性

Question

在链接上，我向您展示了我程序中的所有类(class)

我的 customerframe 类中有这样的属性:

 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，在执行此操作时，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; }

错误是这样的

inconsistent accessibility property type is less accessible than property

在类里面，我将执行以下操作:

        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;

但为什么我的属性会出现问题？我该如何解决这个问题才能让它发挥作用？提前致谢

Answer 1

显然，CustomerFiles.Phone 类型(或者它的包含类型 CustomerFiles，如果它是类型而不是命名空间)没有 public 的可见性。由于您创建的返回类型的属性是公共(public)的，因此类型本身也需要是 public。