JSON.Net：强制序列化所有私有字段和子类中的所有字段

Question

我有一个有几个不同类的类，我将这些类中的信息发送给客户，但我不想将它们全部发送出去，所以有些是私有的，有些是[JsonObject(MemberSerialization.OptIn)]旗帜等。但是，现在我想在需要关闭服务器时每隔12个小时（我不想使用数据库）对所有这些对象进行备份，所以我想做的（如果可能的话）是强制JSON .Net Serializer转换对象和属于该对象的所有对象。例如：class Foo{ public int Number; private string name; private PrivateObject po = new PrivateObject(); public string ToJSON() { /* Serialize my public field, my property and the object PrivateObject */ }}我尝试了这段代码（即使它已经过时了）但它没有序列化与我的对象相关的对象： Newtonsoft.Json.JsonSerializerSettings jss = new Newtonsoft.Json.JsonSerializerSettings();        Newtonsoft.Json.Serialization.DefaultContractResolver dcr = new Newtonsoft.Json.Serialization.DefaultContractResolver();        dcr.DefaultMembersSearchFlags |= System.Reflection.BindingFlags.NonPublic;        jss.ContractResolver = dcr;        return Newtonsoft.Json.JsonConvert.SerializeObject(this, jss);

Answer 1

这应该工作：

var settings = new JsonSerializerSettings() { ContractResolver = new MyContractResolver() };

var json = JsonConvert.SerializeObject(obj, settings);

public class MyContractResolver : Newtonsoft.Json.Serialization.DefaultContractResolver

{

    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)

    {

        var props = type.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)

                        .Select(p => base.CreateProperty(p, memberSerialization))

                    .Union(type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)

                               .Select(f => base.CreateProperty(f, memberSerialization)))

                    .ToList();

        props.ForEach(p => { p.Writable = true; p.Readable = true; });

        return props;

    }

}

Answer 2

它需要.NET 3.5或更高版本。

对于我们这些坚持2.0的人......

public class ForceJSONSerializePrivatesResolver : Newtonsoft.Json.Serialization.DefaultContractResolver

{

    protected override IList<Newtonsoft.Json.Serialization.JsonProperty> CreateProperties(System.Type type, MemberSerialization memberSerialization)

    {

        var props = type.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);

        List<Newtonsoft.Json.Serialization.JsonProperty> jsonProps = new List<Newtonsoft.Json.Serialization.JsonProperty>();

        foreach( var prop in props )

        {

        jsonProps.Add( base.CreateProperty(prop, memberSerialization));

        }

        foreach( var field in type.GetFields(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance) )

        {

        jsonProps.Add ( base.CreateProperty( field, memberSerialization ) );

        }

        jsonProps.ForEach(p => { p.Writable = true; p.Readable = true; });

        return jsonProps;

    }

}

......似乎有效。

Answer 3

这是一个.linq脚本的完整实现，以防任何人想要使用私有子类进行测试 - 例如，见A有私有子类B.

void Main()

{

    var a = A.Test();

    SerialiseAllFields.Dump(a);

}

class A

{

    private int PrivField1;

    private int PrivProp1 { get; set; }

    private B PrivSubClassField1;

    public static A Test()

    {

        return new A { PrivField1 = 1, PrivProp1 = 2, PrivSubClassField1 = B.Test() };

    }

}

class B

{

    private int PrivField1;

    private int PrivProp1 { get; set; }

    public static B Test()

    {

        return new B { PrivField1 = 3, PrivProp1 = 4 };

    }

}

// Define other methods and classes here

public static class SerialiseAllFields

{

    public static void Dump(object o, bool indented = true)

    {

        var settings = new Newtonsoft.Json.JsonSerializerSettings() { ContractResolver = new AllFieldsContractResolver() };

        if (indented)

        {

            settings.Formatting = Newtonsoft.Json.Formatting.Indented;

        }

        Newtonsoft.Json.JsonConvert.SerializeObject(o, settings).Dump();

    }

}

public class AllFieldsContractResolver : Newtonsoft.Json.Serialization.DefaultContractResolver

{

    protected override IList<Newtonsoft.Json.Serialization.JsonProperty> CreateProperties(Type type, Newtonsoft.Json.MemberSerialization memberSerialization)

    {

        var props = type

            .GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)

            .Select(p => base.CreateProperty(p, memberSerialization))

            .Union(type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)

            .Select(f => base.CreateProperty(f, memberSerialization)))

            .ToList();

        props.ForEach(p => { p.Writable = true; p.Readable = true; });

        return props;

    }

}

有趣的是，属性的支持字段也是序列化的，即输出为：

{

  "PrivProp1": 2,

  "PrivField1": 1,

  "<PrivProp1>k__BackingField": 2,

  "PrivSubClassField1": {

    "PrivProp1": 4,

    "PrivField1": 3,

    "<PrivProp1>k__BackingField": 4

  }

}