PropertyInfo如何实现深层属性访问

在C#中，可以使用PropertyInfo类实现深层属性访问。首先，获取对象的类型信息，然后使用GetProperty方法获取指定属性的PropertyInfo对象，再递归地获取嵌套属性的PropertyInfo对象，直到达到需要访问的深层属性。

以下是一个示例代码，演示如何使用PropertyInfo实现深层属性访问：

using System; using System.Reflection;  public class Person {     public string Name { get; set; }     public Address Address { get; set; } }  public class Address {     public string Street { get; set; }     public string City { get; set; } }  class Program {     static void Main()     {         Person person = new Person         {             Name = "John Doe",             Address = new Address             {                 Street = "123 Main St",                 City = "City"             }         };          PropertyInfo propertyInfo = GetDeepPropertyInfo(person, "Address.City");         if (propertyInfo != null)         {             object propertyValue = GetDeepPropertyValue(person, "Address.City");             Console.WriteLine(propertyInfo.Name + ": " + propertyValue);         }     }      static PropertyInfo GetDeepPropertyInfo(object obj, string propertyName)     {         Type type = obj.GetType();         string[] propertyNames = propertyName.Split('.');          PropertyInfo propertyInfo = null;         foreach (string name in propertyNames)         {             propertyInfo = type.GetProperty(name);             if (propertyInfo != null)             {                 type = propertyInfo.PropertyType;             }             else             {                 return null;             }         }          return propertyInfo;     }      static object GetDeepPropertyValue(object obj, string propertyName)     {         Type type = obj.GetType();         string[] propertyNames = propertyName.Split('.');          object propertyValue = null;         foreach (string name in propertyNames)         {             PropertyInfo propertyInfo = type.GetProperty(name);             if (propertyInfo != null)             {                 propertyValue = propertyInfo.GetValue(obj);                 obj = propertyValue;                 type = propertyInfo.PropertyType;             }             else             {                 return null;             }         }          return propertyValue;     } } 

在上面的示例中，GetDeepPropertyInfo和GetDeepPropertyValue方法分别用于获取深层属性的PropertyInfo对象和属性值。通过使用这两个方法，可以实现对任意深层属性的访问。