一个可以生成复杂结构的json数据的简单例子

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder builder = new StringBuilder();
            User user = new User("abc","123456");
            Person p = new Person();
            p.Code = "B0531";
            p.User = user;
            //Console.WriteLine(Get<User>(ref builder,user));
            //Console.WriteLine();
            Get<Person>(ref builder, p);
            Console.WriteLine(builder.ToString());
            Console.Read();
        }

        private static void Get<T>(ref StringBuilder builder,T obj) //where T:new()
        {
            
            //T type = new T();
            //PropertyInfo[] properties = type.GetType().GetProperties();
            if (obj == null) { return; }
            PropertyInfo[] properties = obj.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
            if (properties.Length == 0) { return; }
            //builder.AppendFormat("\"{0}\":{", obj.GetType().Name);
            builder.Append("\"" + obj.GetType().Name + "\":{");
            for (int i = 0; i < properties.Length;i++ ) {
                if(properties[i].PropertyType.IsValueType||properties[i].PropertyType.Name.StartsWith("String")){
                    builder.AppendFormat("\"{0}\":\"{1}\"", properties[i].Name, properties[i].GetValue(obj, null));
                }
                else{
                    Get(ref builder,properties[i].GetGetMethod().Invoke(obj,null));
                }
                if(i<properties.Length-1){
                    builder.Append(",");
                }
            }

            builder.Append("}");
            //return builder.ToString();
        }
    }

    public class Person {
        private string _code;
        private User _user;
        public string Code {
            get { return this._code; }
            set { this._code = value; }
        }
        public User User {
            get { return this._user; }
            set { this._user = value; }
        }
    }

    public class User 
    {
        private string _name;
        private string _secret;

        public string Name {
            get { return this._name; }
            set { this._name = value; }
        }

        public string Secret {
            get { return this._secret; }
            set { this._secret = value; }
        }

        public User() { }

        public User(string name,string secret) 
        {
            this._name = name;
            this._secret = secret;
        }
    }
}

实际上，这段代码的关键是：PropertyInfo.GetGetMethod()方法

PropertyInfo.GetGetMethod返回表示此属性的get访问器的MethodInfo