将JSON解析为C#对象-动态获取属性
(一句话跳到粗体部分tl;dr:) 下面是JSON对象。在查看之前,请注意:将JSON解析为C#对象-动态获取属性,c#,json,json.net,C#,Json,Json.net,(一句话跳到粗体部分tl;dr:) 下面是JSON对象。在查看之前,请注意: 像BTC\u AMP这样的货币对列表将永远存在,为了举例,我将其删除 BTC_AMP似乎是包含某些字段的命名对象 { "BTC_AMP": { "asks": [ [ "0.00007400", 5 ] ], "bids": [ [ "0.00007359",
- 像
这样的货币对列表将永远存在,为了举例,我将其删除BTC\u AMP
似乎是包含某些字段的命名对象BTC_AMP
{ "BTC_AMP": { "asks": [ [ "0.00007400", 5 ] ], "bids": [ [ "0.00007359", 163.59313969 ] ], "isFrozen": "0", "seq": 38044678 }, "BTC_ARDR": { "asks": [ [ "0.00003933", 7160.61031389 ] ], "bids": [ [ "0.00003912", 1091.21852308 ] ], "isFrozen": "0", "seq": 16804479 }, }
BTC\u AMP
,BTC\u ARDR
,等等
您可能可以看到我将如何使用此…如何在不预先创建每个对名称的情况下映射此对象?
希望我错过了一些明显的东西
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…如果我在某处有一个货币对列表,我至少可以动态创建一个对象/对象的属性吗?似乎没有手写那么可笑 您可以执行以下操作:
dynamic data = Json.Decode(json);
然后在数据中,所有对象都处于运行时 您可以执行以下操作:
dynamic data = Json.Decode(json);
然后在数据中,所有对象都处于运行时 这里有几个问题:
- 根对象具有大量可变的属性,其值对应于固定的数据类型
。由于您不希望创建硬编码所有这些属性的根类型,因此可以反序列化到PoloniexPairInfo
,如中所示字典
和Bid
属性在JSON中表示为不同类型值的数组:Ask
您希望通过将特定数组索引处的值绑定到特定的c#属性,将内部数组映射到固定的POCO[ [ "0.00007359", 163.59313969 ] ]
。您可以使用中的PoloniexPriceVolume
执行此操作ObjectToArrayConverter
- 最后,JSON值
有一个字符串值“0”,但您希望将其映射到“isfreeze”
值bool
。您可以通过从中调整public bool isfreezed{get;set;}
来实现这一点BoolConverter
[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);
}
}
[JsonConverter(typeof(ObjectToArrayConverter))]
公共类PoloniexPriceVolume
{
[JsonProperty(顺序=1)]
公共字符串Price{get;set;}
[JsonProperty(顺序=2)]
公共双卷{get;set;}
}
公共类PoloniexPairInfo
{
公共列表要求{get;set;}
公共列表出价{get;set;}
[JsonConverter(类型(BoolConverter))]
公共bool已冻结{get;set;}
公共int Seq{get;set;}
}
公共类ObjectToArrayConverter:JsonConverter
{
//https://stackoverflow.com/a/39462464/3744182
公共覆盖布尔CanConvert(类型objectType)
{
返回类型(T)==objectType;
}
公共重写void WriteJson(JsonWriter编写器、对象值、JsonSerializer序列化器)
{
var objectType=value.GetType();
var contract=serializer.ContractResolver.ResolveContract(objectType)作为JsonObjectContract;
如果(合同==null)
抛出新的JsonSerializationException(string.Format(“无效类型{0}.”,objectType.FullName));
writer.writestarray();
foreach(SerializableProperties(contract)中的var属性)
{
var propertyValue=property.ValueProvider.GetValue(值);
if(property.Converter!=null&&property.Converter.CanWrite)
WriteJson(writer、propertyValue、serializer);
其他的
serializer.Serialize(writer,propertyValue);
}
writer.WriteEndArray();
}
公共重写对象ReadJson(JsonReader阅读器,类型objectType,对象existingValue,JsonSerializer序列化程序)
{
var contract=serializer.ContractResolver.ResolveContract(objectType)作为JsonObjectContract;
如果(合同==null)
抛出新的JsonSerializationException(string.Format(“无效类型{0}.”,objectType.FullName));
if(reader.MoveToContentAndAssert().TokenType==JsonToken.Null)
返回null;
if(reader.TokenType!=JsonToken.StartArray)
抛出新的JsonSerializationException(string.Format(“标记{0}不是JsonToken.StartArray”,reader.TokenType));
//未实现:JsonObjectContract.CreatorParameters、序列化回调、,
existingValue=existingValue??contract.DefaultCreator();
使用(var enumerator=SerializableProperties(contract).GetEnumerator())
{
while(true)
{
开关(reader.ReadToContentAndAssert().TokenType)
{
案例JsonToken.EndArray:
返回现有值;
违约:
如果(!enumerator.MoveNext())
{
reader.Skip();
打破
}
var属性=枚举数。当前值;
对象属性值;
//待办事项:
// 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);
其他的
propertyValue=serializer.Deseri