无法使用 DataContractJsonSerializer 将对象序列化为 JSON

Question

我从https://msdn.microsoft.com/en-us/library/bb410770(v=vs.110).aspx 中获取了以下代码并将其放入 Visual Studio 项目中。

Program.cs

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;

namespace DataContractJsonSerializer_Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a person object.
            Person p = new Person();
            p.name = "John";
            p.age = 42;

            // Serialize the Person object to a memory stream using DataContractJsonSerializer.
            MemoryStream stream1 = new MemoryStream();
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(DataContractJsonSerializer));

            // Use the WriteObject method to write JSON data to the stream.
            ser.WriteObject(stream1, p);

            // Show the JSON output.
            stream1.Position = 0;
            StreamReader sr = new StreamReader(stream1);
            Console.Write("JSON form of Person object: ");
            Console.WriteLine(sr.ReadToEnd());
            Console.Read();
        }
    }
}

Person.cs

using System.Runtime.Serialization;

namespace DataContractJsonSerializer_Example
{
    [DataContract]
    class Person
    {
        [DataMember]
        internal string name;

        [DataMember]
        internal int age;
    }
}

我收到以下运行时错误：

An unhandled exception of type 'System.Runtime.Serialization.InvalidDataContractException' occurred in System.Runtime.Serialization.dll

Additional information: Type 'System.Runtime.Serialization.Json.DataContractJsonSerializer' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute.  If the type is a collection, consider marking it with the CollectionDataContractAttribute.

异常发生在这一行：

ser.WriteObject(stream1, p);

这似乎很奇怪。而不是标记 Person 类，它似乎希望我标记 DataContractJsonSerializer 类本身。另一个奇怪的是，我从 MSDN 下载了示例代码并运行了他们的版本，这与我的基本相同，没有任何问题。他们的项目是一个 VS2010 项目，他们将 Person 类与包含 Main 方法的类放在同一个文件中，但这应该没什么区别。谁能告诉我我做错了什么？

Answer 1

问题上线了 DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(DataContractJsonSerializer)); 它应该是 DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Person));