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[英]OData V4 failing to properly serialize list of POCO(?)s containing a System.Object property
[英]Serialize poco containing object property into Json
我有一類需要序列化才能傳遞給另一個系統。
該類包含一個定義為對象的屬性,因為該對象將包含的類的類型在運行時可能會有所不同。
我的課程看起來像是這種簡化的模型。
public class MyTestXML
{
public string String1 { get; set; }
public string String2 { get; set; }
[System.Xml.Serialization.XmlElementAttribute("First", typeof(MyFirstObject),
Form = System.Xml.Schema.XmlSchemaForm.Qualified)]
[System.Xml.Serialization.XmlElementAttribute("Second", typeof(MySecondObject),
Form = System.Xml.Schema.XmlSchemaForm.Qualified)]
public object MyObject { get; set; }
}
public class MyFirstObject
{
public string theFirstObjectString { get; set; }
}
public class MySecondObject
{
public string theSecondObjectString { get; set; }
}
此類通過使用XmlElementAttribute和XmlSerializer完美地序列化為xml,但是當我嘗試將其序列化為Json(使用Newtonsoft Json.Net)時,該對象是未定義的類型,因此無法反序列化。
有沒有一種方法可以在序列化時在Json屬性中指定XmlElementAttribute以獲得相同的結果?
我想為序列化的對象提供Json的使用,因為它是xml大小的一半,但是除非我能解決對象屬性問題的序列化,否則我不能。
提前致謝。
您將必須創建自己的自定義序列化行為。 在這里看看這個答案: https : //stackoverflow.com/a/22722467/2039359關於如何為Json.Net實現自己的JsonConverter
在您的情況下,您可以執行以下操作來創建json
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
MyTestXML myTestXml = (MyTestXML) value;
JObject jObject = JObject.FromObject(value);
JProperty prop = jObject.Children<JProperty>().First(p=>p.Name.Contains("MyObject"));
if (myTestXml.MyObject.GetType() == typeof (MyFirstObject))
{
prop.AddAfterSelf(new JProperty("First", JToken.FromObject(myTestXml.MyObject)));
prop.Remove();
jObject.WriteTo(writer);
}
else if (myTestXml.MyObject.GetType() == typeof (MySecondObject))
{
prop.AddAfterSelf(new JProperty("Second", JToken.FromObject(myTestXml.MyObject)));
prop.Remove();
jObject.WriteTo(writer);
}
}
反序列化時,類似這樣
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
JObject jo = JObject.Load(reader);
MyTestXML myTestXml = new MyTestXML();
serializer.Populate(jo.CreateReader(), myTestXml);
object myObject = null;
if (jo["First"] != null)
{
myObject = new MyFirstObject { TheFirstObjectString = jo["First"].SelectToken(@"TheFirstObjectString").Value<string>() };
}
if (jo["Second"] != null)
{
myObject = new MySecondObject { TheSecondObjectString = jo["Second"].SelectToken(@"TheSecondObjectString").Value<string>() };
}
myTestXml.MyObject = myObject;
return myTestXml;
}
要使用它,您將在序列化/反序列化時提供JsonConverter
,如下所示:
var settings = new JsonSerializerSettings();
settings.Converters.Add(new MyTextXmlJsonConverter());
var a = JsonConvert.SerializeObject(myTestXml, settings);
希望這就是您要尋找的
另一種選擇是創建一個自定義合同解析器,它允許您檢測應用了哪個xml屬性。 然后,如果需要特定的輸出,則可以在屬性上應用自定義JsonConverter。
public class CustomContractResolver : DefaultContractResolver
{
private readonly JsonMediaTypeFormatter formatter;
public CustomContractResolver(JsonMediaTypeFormatter formatter)
{
this.formatter = formatter;
}
public JsonMediaTypeFormatter Formatter
{
[DebuggerStepThrough]
get { return this.formatter; }
}
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
JsonProperty property = base.CreateProperty(member, memberSerialization);
this.ConfigureProperty(member, property);
return property;
}
private void ConfigureProperty(MemberInfo member, JsonProperty property)
{
if (Attribute.IsDefined(member, typeof(XmlElementAttribute), true))
{
var attribute = member.CustomAttributes.Where(x => x.AttributeType == typeof(XmlElementAttribute)).First();
// do something with your attribute here like apply a converter
property.Converter = new XmlAttributeJsonConverter();
}
}
}
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