在c#中在运行时将expando属性添加到类型化对象

using System;
using System.Dynamic;

class Program
{
    static void Main()
    {
        dynamic obj = new ExpandoObject();

        // 添加属性
        obj.Name = "John";
        obj.Age = 30;

        // 访问属性
        Console.WriteLine(obj.Name);
        Console.WriteLine(obj.Age);

        // 删除属性
        var expandoDict = (IDictionary<string, object>)obj;
        expandoDict.Remove("Age");

        // 检查属性是否存在
        if (expandoDict.ContainsKey("Age"))
        {
            Console.WriteLine(obj.Age);
        }
        else
        {
            Console.WriteLine("属性不存在");
        }
    }
}