I’m encountering a JSON (de)serialization exception when using Twitterizer‘s LookUp method. The exception states:
Unexpected token when deserializing object: Integer
Here is roughly what my code looks like:
// Populates the lookup options, requests the user details and processes the results
private void LookUpFollowersWithoutDetail(List<Follower> followersWithoutDetail)
{
LookupUsersOptions lookupOptions = new LookupUsersOptions();
for (int index = 0; index < followersWithoutDetail.Count && index < 100; index++)
{
lookupOptions.UserIds.Add(followersWithoutDetail[index].UserId);
}
RequestResult result = GetUserDetails(lookupOptions);
// process the results
}
The method that gets the user details looks like this:
// Performs the lookup and saves the users to the database
private RequestResult GetUserDetails(LookupUsersOptions lookupOptions)
{
try
{
// Look up the followers
TwitterResponse<TwitterUserCollection> userLookupResponse =
TwitterUser.Lookup(_tokens, lookupOptions); // <-- Throws Exception
if (userLookupResponse.Result == RequestResult.Success)
{
SaveUserDetails(userLookupResponse);
}
return userLookupResponse.Result;
}
catch (Exception e)
{
Console.WriteLine("Exception in GetUserDetails: " + e.Message);
}
return RequestResult.Unknown;
}
I don’t do anything fancy, I just put a bunch of integers (User Id’s of the followers) in the lookup options and then I call the lookup method with those options. Most of the time the method works fine, but every once in a while I get the exception mentioned in the beginning of this post. Has anybody encountered a similar issue with Twitterizer and have they figured out a solution?
Update (for Ricky):
Here is the stack trace:
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateAndPopulateObject(JsonReader reader, JsonObjectContract contract, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueProperty(JsonReader reader, JsonProperty property, Object target, Boolean gottenCurrentValue, Object currentValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonReader reader, Object target)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateAndPopulateObject(JsonReader reader, JsonObjectContract contract, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueProperty(JsonReader reader, JsonProperty property, Object target, Boolean gottenCurrentValue, Object currentValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonReader reader, Object target)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateAndPopulateObject(JsonReader reader, JsonObjectContract contract, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueNonProperty(JsonReader reader, Type objectType, JsonContract contract)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IWrappedCollection wrappedList, JsonReader reader, String reference, JsonArrayContract contract)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.<>c_DisplayClass1.b_0(IList l, Boolean isTemporaryListReference)
at Newtonsoft.Json.Utilities.CollectionUtils.CreateAndPopulateList(Type listType, Action2 populateList)1.Deserialize(Byte[] webResponseData, DeserializationHandler deserializationHandler)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateAndPopulateList(JsonReader reader, String reference, JsonArrayContract contract)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String reference)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueNonProperty(JsonReader reader, Type objectType, JsonContract contract)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value)
at Twitterizer.Core.SerializationHelper
at Twitterizer.Core.TwitterCommand1.ExecuteCommand()1 command)
at Twitterizer.Core.CommandPerformer.PerformAction[T](ICommand
at Twitterizer.TwitterUser.Lookup(OAuthTokens tokens, LookupUsersOptions options)
at OBFUSCATED.System.OBFUSCATED.GetUserDetails(LookupUsersOptions lookupOptions) in C:\Users\user\Path\To\MyClass.cs:line 306
Here is the list of User Id’s that were supplied when this exception occurred:
- lookupOptions.UserIds Count = 100 Twitterizer.TwitterIdCollection
[0] 39026441 decimal
[1] 360825202 decimal
[2] 377779483 decimal
[3] 77599652 decimal
[4] 199504556 decimal
[5] 15290529 decimal
[6] 15293368 decimal
[7] 15295132 decimal
[8] 15295838 decimal
[9] 15300610 decimal
[10] 15307479 decimal
[11] 15314695 decimal
[12] 15315646 decimal
[13] 15316087 decimal
[14] 15322893 decimal
[15] 15324552 decimal
[16] 15325815 decimal
[17] 15330982 decimal
[18] 15332031 decimal
[19] 15332318 decimal
[20] 15336542 decimal
[21] 15338843 decimal
[22] 15340130 decimal
[23] 15341396 decimal
[24] 15341681 decimal
[25] 15342905 decimal
[26] 15343278 decimal
[27] 15351598 decimal
[28] 15358123 decimal
[29] 15361196 decimal
[30] 15361723 decimal
[31] 15363684 decimal
[32] 15365834 decimal
[33] 15366588 decimal
[34] 15375866 decimal
[35] 15377256 decimal
[36] 15384679 decimal
[37] 15384994 decimal
[38] 15388036 decimal
[39] 15388874 decimal
[40] 15390556 decimal
[41] 15397486 decimal
[42] 15398320 decimal
[43] 15401318 decimal
[44] 15421131 decimal
[45] 15421937 decimal
[46] 15422192 decimal
[47] 15433173 decimal
[48] 15433807 decimal
[49] 15435566 decimal
[50] 15447574 decimal
[51] 15448831 decimal
[52] 15449755 decimal
[53] 15450751 decimal
[54] 15452924 decimal
[55] 15456465 decimal
[56] 15456590 decimal
[57] 15458653 decimal
[58] 15458901 decimal
[59] 15461998 decimal
[60] 15465107 decimal
[61] 15467755 decimal
[62] 15468099 decimal
[63] 15470126 decimal
[64] 15475251 decimal
[65] 15475461 decimal
[66] 15478303 decimal
[67] 15479254 decimal
[68] 15479572 decimal
[69] 15479736 decimal
[70] 15484821 decimal
[71] 15487227 decimal
[72] 15487287 decimal
[73] 15489577 decimal
[74] 15490132 decimal
[75] 15501961 decimal
[76] 15503943 decimal
[77] 15505543 decimal
[78] 15510316 decimal
[79] 15515724 decimal
[80] 15523378 decimal
[81] 15526558 decimal
[82] 15529204 decimal
[83] 15538443 decimal
[84] 15554417 decimal
[85] 15564955 decimal
[86] 15569189 decimal
[87] 15575242 decimal
[88] 15575635 decimal
[89] 15578111 decimal
[90] 15580710 decimal
[91] 15585660 decimal
[92] 15589332 decimal
[93] 15594166 decimal
[94] 15597341 decimal
[95] 15603662 decimal
[96] 15608792 decimal
[97] 15618128 decimal
[98] 15620785 decimal
[99] 15620915 decimal
+ Raw View
After looking into this, I’ve determined Twitter didn’t change anything. This appears to be a real live bug having to do with parsing geo location data.
JSON.NET (the library Twitterizer uses to deserialize json data) reads a coordinate value as a long, but Twitterizer is casting it as a double.
Two lines of code later and the bug is fixed.
If you would like to apply the patch yourself, the fix is in Twitterizer2\Methods\Geo\Coordinate.cs
Line 119 becomes:
Line 123 becomes: