c# - When serializing JSON: how to determine what caused InvalidCastException? -


i serializing class using newtonsoft.json, , i'm finding member in class causing error:

system.invalidcastexception: specified cast not valid.    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializedictionary(jsonwriter writer, idictionary values, jsondictionarycontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializevalue(jsonwriter writer, object value, jsoncontract valuecontract, jsonproperty member, jsoncontainercontract containercontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serialize(jsonwriter jsonwriter, object value, type objecttype)    @ newtonsoft.json.jsonserializer.serializeinternal(jsonwriter jsonwriter, object value, type objecttype)    @ newtonsoft.json.jsonserializer.serialize(jsonwriter jsonwriter, object value, type objecttype)    @ newtonsoft.json.jsonconvert.serializeobjectinternal(object value, type type, jsonserializer jsonserializer)    @ newtonsoft.json.jsonconvert.serializeobject(object value, type type, jsonserializersettings settings)    @ newtonsoft.json.jsonconvert.serializeobject(object value)    @ blah(blah blah) in c:\users\gnychis\documents\example\example\blah.cs:line 336

the exception doesn't tell me member in class though, i'm having extremely hard time determining member has invalidcastexception.

does know way can narrow down issue?

first, must find class, throws exception (if don't know now). create instanses of every class , serialize them.

after have 2 variants. first: create new class likes your, first field. try serialize it. if ok, create class 2 fields. try serialize it. repeat until exception.

other variant: use [scriptignore] [attribute]1 fields step step.

third variant: fill class different values, , use debug. shall find value @ newtonsoft.json.jsonconvert.serializeobject(object value, type type, jsonserializersettings settings)


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