我有一个字典列表,我想序列化,但是我收到以下错误:
System.NotSupportedException不支持嵌套或锯齿状列表和数组
甚至可以将其序列化吗?我尝试将其推送到其他班级,并List<Dto>
Dto
班级为IEnumerable
Dictionary
,DynamicType
对于字典中的对象,但它仍然无法正常工作。
我是以完全错误的方式解决这个问题,还是我错过了一些微妙的东西?
示例代码:
var zone = DateTimeZoneProviders.Tzdb["Europe/London"];
_testObj = new Person
{
Name = "Homer",
Age = 38,
Timestamp = new ZonedDateTime(Instant.FromUtc(2013, 6, 12, 17, 53, 23), zone),
Target = new DataCollection(new Dictionary<string, Type>()
{
{"Date", typeof(DateTime)}
}, new List<Dictionary<string, object>>
{
new Dictionary<string, object>
{
{"Date", new DateTime(2015, 1, 1)}
}
}
, new List<string> { "Date" })
DataCollection
:
[Serializable, ProtoContract(IgnoreListHandling = true), DataContract, JsonObject]
public class DataCollection : IEnumerable<IDictionary<string, object>>
{
public DataCollection(Dictionary<string, Type> fields, List<Dictionary<string, object>> data, List<string> keyFields)
{
Fields = fields;
KeyFields = keyFields;
Data = data;
}
public DataCollection()
{
Fields = new Dictionary<string, Type>();
Data = new List<Dictionary<string, object>>();
KeyFields = new List<string>();
}
[ProtoMember(1), DataMember]
public Dictionary<string, Type> Fields { get; set; }
[ProtoMember(2), DataMember]
public List<string> KeyFields { get; set; }
[ProtoMember(3), DataMember]
public List<Dictionary<string, object>> Data { get; set; }
public void Add(Dictionary<string, object> value)
{
Data.Add(value);
}
public IEnumerator<IDictionary<string, object>> GetEnumerator()
{
return Data.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
如果我没有包含ProtoMember(3),我可以顺序完成。
答案 0 :(得分:2)
所以问题归结为Protobuf-net,这是正确的,不喜欢字典中的对象类型。我不想详细说明为什么我需要它,只需说你需要使用2个代理类的组合,并且对象Type需要用BinaryFormatter序列化为byte []然后发送到Protobuf网,因为Protobuf规范不承认对象类型。
我正在从这个网站复制解决方案的灵感:http://rushfrisby.com/serializing-non-serializable-types-with-protobuf/
根据发布解决方案的规则而不是单独链接到外部网站:
以此课程为例:
[DataContract]
public class MyNameValueInfo
{
[DataMember(Order = 1)]
public string Name { get; set; }
[DataMember(Order = 2)]
public object Value { get; set; }
}
MyNameValueInfo无法序列化,因为它不知道如何序列化Value属性(typeof对象)。它将引发异常:“没有为类型定义Serializer:System.Object”
为了解决这个问题,我们需要提供protobuf-net可以序列化的MyNameValueInfo的代理。首先注册代理类型(只需要执行一次):
RuntimeTypeModel.Default.Add(typeof(MyNameValueInfo),false)。SetSurrogate(typeof(MyNameValueInfoSurrogate));
然后实现MyNameValueInfoSurrogate,以便它可以从/转换为MyNameValueInfo并且可以通过protobuf-net进行序列化:
[DataContract]
public class MyNameValueInfoSurrogate
{
//string is serializable so we'll just copy this property back and forth
[DataMember(Order = 1)]
public string Name { get; set; }
//byte[] is serializable so we'll need to convert object to byte[] and back again
[DataMember(Order = 2)]
public byte[] Value { get; set; }
public static implicit operator MyNameValueInfo(MyNameValueInfoSuggorage suggorage)
{
return suggorage == null ? null : new MyNameValueInfo
{
Name = suggorage.Name,
Value = Deserialize(suggorage.Value)
};
}
public static implicit operator MyNameValueInfoSuggorage(MyNameValueInfo source)
{
return source == null ? null : new MyNameValueInfoSuggorage
{
Name = source.Name,
Value = Serialize(source.Value)
};
}
private static byte[] Serialize(object o)
{
if (o == null)
return null;
using (var ms = new MemoryStream())
{
var formatter = new BinaryFormatter();
formatter.Serialize(ms, o);
return ms.ToArray();
}
}
private static object Deserialize(byte[] b)
{
if (b == null)
return null;
using (var ms = new MemoryStream(b))
{
var formatter = new BinaryFormatter();
return formatter.Deserialize(ms);
}
}
}