(跳到单句tl的粗体部分;dr:)
下面是JSON对象。在查看它之前,请注意:
像example
BTC_AMP
这样的货币对列表永远在继续,我为了{ "BTC_AMP":{ "asks":[ "0.00007400",5 ],"bids":[ "0.00007359",163.59313969 ],"isFrozen":"0","seq":38044678 },"BTC_ARDR":{ "asks":[“7160.61031389”,1091.21852308 ],"bids":[ "0.00003933",1091.21852308 ],"isFrozen":"0","seq":0.00003933 },}
我可以像here中描述的那样使用Json.NET很好地映射对象。我的问题是,在我看来,我似乎需要创建一个对象,并为一千个货币对预定义属性名称,如BTC_AMP
、BTC_ARDR
等。
您可能知道我要做什么了……如何在不预先创建每个单独的名称对的情况下映射此对象?
希望我在这里遗漏了一些明显的东西。
编辑:代码看起来像这样,我不想做的是:
public class PoloniexPriceVolume
{
public string Price { get; set; }
public double Volume { get; set; }
}
public class PoloniexPairInfo
{
public PoloniexPriceVolume Asks { get; set; }
public PoloniexPriceVolume Bids { get; set; }
public bool IsFrozen { get; set; }
public int Seq { get; set; }
}
public class PoloniexOrderBook
{
public PoloniexPairInfo BTC_AMP { get; set; }
//One thousand and one Arabian currency pairs here
}
编辑2...can如果我在某个地方有货币对列表,我至少会动态创建一个对象/对象的属性?看起来没有手写那么可笑。
发布于 2017-07-31 04:38:09
这里有几个问题:
PoloniexPairInfo
。由于您不想创建硬编码所有这些属性的根类型,因此您可以反序列化为Dictionary<string, PoloniexPairInfo>
,如Create a strongly typed c# object from json object with ID as the name.Bid
中所示,并且Ask
属性在JSON中表示为不同类型的值数组:[ "0.00007359",163.59313969 ]
您希望通过将特定数组索引处的值绑定到特定的c#属性来将内部数组映射到固定的POCO PoloniexPriceVolume
。您可以使用C# JSON.NET - Deserialize response that uses an unusual data structure.
ObjectToArrayConverter<PoloniexPriceVolume>
来完成此操作。JSON值"isFrozen"
有一个字符串值"0“,但是您希望将其映射到bool
值public bool IsFrozen { get; set; }
。您可以通过从Convert an int to bool with Json.Net.
改编BoolConverter
来实现这一点
综合以上几点,您可以使用以下模型和转换器对JSON进行反序列化:
[JsonConverter(typeof(ObjectToArrayConverter<PoloniexPriceVolume>))]
public class PoloniexPriceVolume
{
[JsonProperty(Order = 1)]
public string Price { get; set; }
[JsonProperty(Order = 2)]
public double Volume { get; set; }
}
public class PoloniexPairInfo
{
public List<PoloniexPriceVolume> Asks { get; set; }
public List<PoloniexPriceVolume> Bids { get; set; }
[JsonConverter(typeof(BoolConverter))]
public bool IsFrozen { get; set; }
public int Seq { get; set; }
}
public class ObjectToArrayConverter<T> : JsonConverter
{
//https://stackoverflow.com/a/39462464/3744182
public override bool CanConvert(Type objectType)
{
return typeof(T) == objectType;
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
var objectType = value.GetType();
var contract = serializer.ContractResolver.ResolveContract(objectType) as JsonObjectContract;
if (contract == null)
throw new JsonSerializationException(string.Format("invalid type {0}.", objectType.FullName));
writer.WriteStartArray();
foreach (var property in SerializableProperties(contract))
{
var propertyValue = property.ValueProvider.GetValue(value);
if (property.Converter != null && property.Converter.CanWrite)
property.Converter.WriteJson(writer, propertyValue, serializer);
else
serializer.Serialize(writer, propertyValue);
}
writer.WriteEndArray();
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var contract = serializer.ContractResolver.ResolveContract(objectType) as JsonObjectContract;
if (contract == null)
throw new JsonSerializationException(string.Format("invalid type {0}.", objectType.FullName));
if (reader.MoveToContentAndAssert().TokenType == JsonToken.Null)
return null;
if (reader.TokenType != JsonToken.StartArray)
throw new JsonSerializationException(string.Format("token {0} was not JsonToken.StartArray", reader.TokenType));
// Not implemented: JsonObjectContract.CreatorParameters, serialization callbacks,
existingValue = existingValue ?? contract.DefaultCreator();
using (var enumerator = SerializableProperties(contract).GetEnumerator())
{
while (true)
{
switch (reader.ReadToContentAndAssert().TokenType)
{
case JsonToken.EndArray:
return existingValue;
default:
if (!enumerator.MoveNext())
{
reader.Skip();
break;
}
var property = enumerator.Current;
object propertyValue;
// TODO:
// https://www.newtonsoft.com/json/help/html/Properties_T_Newtonsoft_Json_Serialization_JsonProperty.htm
// JsonProperty.ItemConverter, ItemIsReference, ItemReferenceLoopHandling, ItemTypeNameHandling, DefaultValue, DefaultValueHandling, ReferenceLoopHandling, Required, TypeNameHandling, ...
if (property.Converter != null && property.Converter.CanRead)
propertyValue = property.Converter.ReadJson(reader, property.PropertyType, property.ValueProvider.GetValue(existingValue), serializer);
else
propertyValue = serializer.Deserialize(reader, property.PropertyType);
property.ValueProvider.SetValue(existingValue, propertyValue);
break;
}
}
}
}
static IEnumerable<JsonProperty> SerializableProperties(JsonObjectContract contract)
{
return contract.Properties.Where(p => !p.Ignored && p.Readable && p.Writable);
}
}
public static partial class JsonExtensions
{
//https://stackoverflow.com/a/39462464/3744182
public static JsonReader ReadToContentAndAssert(this JsonReader reader)
{
return reader.ReadAndAssert().MoveToContentAndAssert();
}
public static JsonReader MoveToContentAndAssert(this JsonReader reader)
{
if (reader == null)
throw new ArgumentNullException();
if (reader.TokenType == JsonToken.None) // Skip past beginning of stream.
reader.ReadAndAssert();
while (reader.TokenType == JsonToken.Comment) // Skip past comments.
reader.ReadAndAssert();
return reader;
}
public static JsonReader ReadAndAssert(this JsonReader reader)
{
if (reader == null)
throw new ArgumentNullException();
if (!reader.Read())
throw new JsonReaderException("Unexpected end of JSON stream.");
return reader;
}
}
public class BoolConverter : JsonConverter
{
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
writer.WriteValue(((bool)value) ? "1" : "0");
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.Null)
return null;
var token = JToken.Load(reader);
if (token.Type == JTokenType.Boolean)
return (bool)token;
return token.ToString() != "0";
}
public override bool CanConvert(Type objectType)
{
return objectType == typeof(bool);
}
}
最后,执行以下操作:
var orderBook = JsonConvert.DeserializeObject<Dictionary<string, PoloniexPairInfo>>(jsonString);
工作.Net fiddle。
发布于 2017-07-31 04:23:32
你可以这样做:
dynamic data = Json.Decode(json);
然后在数据中,你的所有对象都在运行时。
https://stackoverflow.com/questions/45404111
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