vb.net - Error with parsing JSON using Json.Net -

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i'm using code parse json string , throws exception, error is:

an unhandled exception of type 'system.invalidcastexception' occurred in myapp.exe additional information: unable cast object of type 'newtonsoft.json.linq.jproperty' type 'newtonsoft.json.linq.jobject'.

i have imported json.net , same code works in different sub , parses fine.

here code:

dim o jobject = jobject.parse(responsecontent) dim results list(of jtoken) = o.children().tolist each item jproperty in results     item.createreader()     select case item.name         case "response"             dim batterycharge string             each subitem jobject in item.values                 batterycharge = subitem("battery_level")                 messagebox.show(batterycharge)             next     end select next

the json string looks , need fetch battery_level if tell me how include more if need great.

{ "response": { "charging_state": "complete", // "charging", ?? "charge_to_max_range": false, // current std/max-range setting "max_range_charge_counter": 0, "fast_charger_present": false, // connected supercharger? "battery_range": 239.02, // rated miles "est_battery_range": 155.79, // range estimated recent driving "ideal_battery_range": 275.09, // ideal miles "battery_level": 91, // integer charge percentage "battery_current": -0.6, // current flowing battery "charge_starting_range": null, "charge_starting_soc": null, "charger_voltage": 0, // has value while charging "charger_pilot_current": 40, // max current allowed charger & adapter "charger_actual_current": 0, // current being drawn "charger_power": 0, // kw (rounded down) of charger "time_to_full_charge": null, // valid while charging "charge_rate": -1.0, // float mi/hr charging or -1 if not charging "charge_port_door_open": true } }

the easiest way avoid using jobject.parse approach , instead deserialize poco, so:

sub main     dim response = jsonconvert.deserializeobject(of responseobject)("*your json string goes here*")      console.writeline("the battery level " & response.response.battery_level) end sub  public class response     public property charging_state string     public property charge_to_max_range boolean     public property max_range_charge_counter integer     public property fast_charger_present boolean     public property battery_range double     public property est_battery_range double     public property ideal_battery_range double     public property battery_level integer     public property battery_current double     public property charge_starting_range object     public property charge_starting_soc object     public property charger_voltage integer     public property charger_pilot_current integer     public property charger_actual_current integer     public property charger_power integer     public property time_to_full_charge object     public property charge_rate double     public property charge_port_door_open boolean end class  public class responseobject     public property response response end class

this means can access , use other properties later on in addition battery_level.


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