DataContractJsonSerializer帮助反序列化Dictionary< string，object []> [英] DataContractJsonSerializer help to deserlize Dictionary<string, object[]>
问题描述
我正在尝试使用DataContractJsonSerializer反序列化JSON字符串，如下所示:
I'm trying to use DataContractJsonSerializer to deserialize a JSON string, that looks like:
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Dictionary< string，object []>)));
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Dictionary<string, object[]>));
ser. ReadObject();
ser.ReadObject();
此输出始终是一个空字典，没有例外.
The output for this is always an empty dictionary with no exceptions.
我的问题是类型参数应在构造函数中是什么?我注意到，还有另一个构造函数要求一个knownTypes，是否可能需要为对象数组中的内容放置一个int和bool列表?我对此有点疑惑.请帮忙！
My question is what should the type parameter be in the constructor? I've noticed that there's another constructor that asks for a knownTypes, could I have perhaps need to put a list of int and bool for what's in the object array? I'm kinda puzzled of what's wrong with this. Please help!
谢谢！
推荐答案
字典在JSON中作为JSON数组进行序列化KeyValuePair< K，V> -由于CLR中可以使用字符串以外的其他类型作为键，因此它不能直接映射到JSON对象.
Dictionaries are serialized in JSONas arrays of KeyValuePair<K, V> - since one can use types other than strings as the key in CLR, it doesn't map directly to a JSON Object.
要使用DataContractJsonSerializer将任意JSON对象读入字典，可以使用ISerializable类型:
To read an arbitrary JSON object into a dictionary using the DataContractJsonSerializer, you can use an ISerializable type:
| public 类 |
| { |
| 静态 string json = " {\" ":[123，true]，\\" p2 \ ":[456，́false]}" ; |
| .[可序列化] |
| public 类 MyCustomDict:ISerializable |
| .{ |
| public 字典< 字符串 ， 对象 []>字典 |
| public MyCustomDict() |
| { |
| 新 Dictionary< ， []>(); |
| 受保护的 MyCustomDict(SerializationInfo info，StreamingContext context) |
| { |
| 新 Dictionary< ， []>(); |
| foreach (可变项 中 信息) |
| Debug.Assert(entry.ObjectType.IsArray); |
| 对象 [] array = entry.Value []; |
| dict.Add(entry.Name，array); |
| public void GetObjectData(SerializationInfo信息，StreamingContext上下文) |
| { |
| foreach (( 字符串 键 in dict.键) |
| ``info.AddValue(key，dict [key]); |
| 静态 void Main( 字符串 [] args) |
| { |
| DataContractJsonSerializerdcjs = new DataContractJsonSerializer( (MyCustomDict))； |
| MemoryStream ms = 新 MemoryStream(Encoding .UTF8.GetBytes(json)); |
| ``MyCustomDict''dict =(MyCustomDict)dcjs.ReadObject(ms); |
| Console.WriteLine(dict.dict.Count); |
| public class DeserializingArbitraryJsonObjects |
| { |
| static string json = "{\"p1\": [123, true], \"p2\":[456, false]}"; |
| [Serializable] |
| public class MyCustomDict : ISerializable |
| { |
| public Dictionary<string, object[]> dict; |
| public MyCustomDict() |
| { |
| dict = new Dictionary<string, object[]>(); |
| } |
| protected MyCustomDict(SerializationInfo info, StreamingContext context) |
| { |
| dict = new Dictionary<string, object[]>(); |
| foreach (var entry in info) |
| { |
| Debug.Assert(entry.ObjectType.IsArray); |
| object[] array = entry.Value as object[]; |
| dict.Add(entry.Name, array); |
| } |
| } |
| public void GetObjectData(SerializationInfo info, StreamingContext context) |
| { |
| foreach (string key in dict.Keys) |
| { |
| info.AddValue(key, dict[key]); |
| } |
| } |
| } |
| static void Main(string[] args) |
| { |
| DataContractJsonSerializer dcjs = new DataContractJsonSerializer(typeof(MyCustomDict)); |
| MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)); |
| MyCustomDict dict = (MyCustomDict)dcjs.ReadObject(ms); |
| Console.WriteLine(dict.dict.Count); |
| } |
| } |
这篇关于DataContractJsonSerializer帮助反序列化Dictionary< string，object []>的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
