c# - 由于保护级别而无法访问类属性

Question

这是我的类声明

public class PlacesAPIResponse
{
    public string formatted_address { get; set; }
    public Geometry geometry { get; set; }
    public Location location { get; set; }
    public string icon { get; set; }
    public Guid id { get; set; }
    public string name { get; set; }
    public string reference { get; set; }
    public string[] types { get; set; }
}
public class Geometry
{
    Location location { get; set; }
}
public class Location
{
    public double lat { get; set; }
    public double lon { get; set; }
}

当我尝试像这样访问它时，我得到了“由于保护级别而无法访问”

PlacesAPIResponse response = new PlacesAPIResponse();
string lon = response.geometry.location.lon;

我做错了什么？

Answer 1

您需要将您的 Geometry.location 字段声明为公共(public)字段:

public class Geometry
{
    public Location location;
}

默认情况下，当您没有显式声明类成员的访问修饰符时，假定它的可访问性是 private。

来自 C# 规范部分 10.2.3 Access Modifiers :

When a class-member-declaration does not include any access modifiers, private is assumed.

---

顺便说一句，您也可以考虑将其设为属性(除非它是 mutable struct )

编辑:此外，即使您修复了访问问题，Location.lon 也被声明为 double 但您隐式地将其分配给了 string 。您还需要将其转换为字符串:

string lon = response.geometry.location.lon.ToString();