JsonConverter byte[]

Question

我有以下代码：

//模型

public class Home{
    public Guid HomeId { get; set; }
    public Guid UserId { get; set; }
    public string Name { get; set; }
    public byte[] Description1 { get; set; }
    public virtual User User { get; set; }
}

public class User
{
    public Guid UserId { get; set; }
    public string Email { get; set; }
    public virtual Perfil Perfil { get; set; }
}

public class Perfil
{
    public Guid UserId { get; private set; }
    public string Name { get; private set; }
    public byte[] Description2 { get; set; }
}

// JsonConverter

public class ByteArrayConverter : JsonConverter
{

    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(byte[]);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.Null)
            return null;

        var m = Convert.FromBase64String((string)reader.Value);
        return m;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        byte[] bytes = (byte[])value;
        writer.WriteValue(Convert.ToBase64String(bytes));
    }
}

//序列化(调用WriteJson函数的ByteArrayConverter，OK)

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

{
"HomeId": "2925362b",
"UserId": "9ea43c30",
"Name": "Name 1",
"Description1": "VABlAHMAdABlAA==", //===> Converts to Base64 (OK)
"User": {
    "UserId": "9ea43c30",
    "Email": "aaaa@aaaa.com",
    "Perfil": {
        "UserId": "9ea43c30",
        "Name": "Name 2",
        "Description2": "dABlAHMAdABlAA==", //===> Converts to Base64  (OK)
    }
}

}

//反序列化

var deserialized = JsonConvert.DeserializeObject<T>(serialized, settings); // T is class Home

 {
"HomeId": "2925362b",
"UserId": "9ea43c30",
"Name": "Name 1",
"Description1": "VABlAHMAdABlAA==", //===> Don't Convert from Base64,  (**Does not call the ReadJson function of ByteArrayConverter**)
"User": {
    "UserId": "9ea43c30",
    "Email": "aaaa@aaaa.com",
    "Perfil": {
        "UserId": "9ea43c30",
        "Name": "Name 2",
        "Description2": "dABlAHMAdABlAA==", //===> Convert from Base64 (OK)
    }
}

}

设置

        var settings = new JsonSerializerSettings
        {
            TypeNameHandling = TypeNameHandling.Objects,
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
            Formatting = Formatting.Indented
        };
        settings.Converters.Add(new ByteArrayConverter());

Description1属性不会进入ByteArrayConverter类的ReadJson函数，因此它不会转换回字节[]，从而生成另一个无效的[]字节，.

对这个问题有什么想法吗？

Answer 1

老问题，但需要澄清

当我不像上面那样使用时，它用以下信息序列化一个byte[]类型：$ type："System.Byte []，mscorlib“$ Value："VABlAHMAdABlAA =="，但是当我去反序列化时，它显示了一个错误:解析值时遇到的意外字符

若要避免反序列化中出现上述错误，请在反序列化中使用以下json设置。

    TypeNameHandling = TypeNameHandling.None

TypeNameHandling设置包括序列化JSON时的类型信息和读取类型信息，以便在反序列化JSON时创建创建类型

欲了解更多详细信息，请阅读：TypeNameHandling枚举

byte[]的序列化是Base-64字符串，当反序列化时它再次生成byte[]。

您不需要像@Brian和@dbc的评论中给出的ByteArrayConverter那样

你可以找到使用在线修改的代码的完整工作示例