C# - How to retrieve an array from json dynamic object?

Question

I am trying to get the array directly from the JSON "data" item into an array variable:

string jsonString = "{\"data\":[
                       {\"name\":false,\"number\":true},
                       {\"name\":false,\"number\":false},
                       {\"name\":true,\"number\":false}
                     ]}";

var serializer = new JavaScriptSerializer();
serializer.RegisterConverters(new[] { new DynamicJsonConverter() });
dynamic jsonObject = serializer.Deserialize(jsonString, typeof(object));

Array jsonArray = jsonObject.data;
// Here error says:
//Cannot implicitly convert type 'System.Collections.Generic.List<object>' to 'System.Array' 

dynamic lastJsonArrayData = jsonArray[jsonArray.Length - 1];
// this is where the error occurs, it says:
//Cannot apply indexing with [] to an expression of type 'Array'

and last thing that I need to do is to convert lastJsonArrayData back to dynamic object but I dont know how.. And I need the last two steps to be performed separately as it stated, it means first to get the array then get the object!! I am a total newbie in C#

EDIT: The real JSON structure is actually more like this:

string jsonString = "{\"firstlevel\":{\"secondlevel\":{\"data\":[
                       {\"name\":false,\"number\":true},
                       {\"name\":false,\"number\":false},
                       {\"name\":true,\"number\":false}
                     ]}}}";

It says: Cannot apply indexing with [] to an expression of type 'Array' — Totallama, Oct 16 '16 at 02:28
Actually I am using it I just corrected here: dynamic lastJsonArrayData — Totallama, Oct 16 '16 at 02:31
Sorry, one more mistake, now corrected: "dynamic lastJsonArrayData = jsonArray[jsonArray.Length - 1];" — Totallama, Oct 16 '16 at 02:37
Actually now error occurs also here: Array jsonArray = jsonObject.data; It says: Cannot implicitly convert type 'System.Collections.Generic.List — Totallama, Oct 16 '16 at 03:02
Today is my first day of programing in C#, so I kind of dont understand anything.. — Totallama, Oct 16 '16 at 03:09
Try changing your line that sets the array to "Array jsonArray = jsonObject.data.ToArray();". The jsonObject.data is returning a generic list that should be an option on the list type. — Joel, Oct 16 '16 at 05:00

score 1 · Accepted Answer · answered Oct 16 '16 at 05:11

1

This seems to work:

var jsonArray = jsonObject.data.ToArray();

(Joel gave me a hint. But he declared Array jsonArray. And it didnt work.)

answered Oct 16 '16 at 05:11

Totallama

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score 0 · Answer 2 · edited May 23 '17 at 12:23

0

You might consider creating a class to map the serialised content I meant , you need a create class of

public class Example{
   public string name;
  public string number;
}

and here you need to change it to

var serializer = new JavaScriptSerializer();
                serializer.RegisterConverters(new[] { new DynamicJsonConverter() });
                dynamic jsonObject = serializer.Deserialize(jsonString, typeof(Example));

Hope this reference gives you a better understanding about serialization and desrialization

https://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer(v=vs.110).aspx

Deserialize JSON with C#

Hope this helps

edited May 23 '17 at 12:23

Community

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answered Oct 16 '16 at 03:51

Geeky

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I posted here the simplest possible structure of JSON just as an example. But my real JSON contains thousands of items and the structure is far more complicated than this.. – Totallama Oct 16 '16 at 04:52
So did you try to change the lines of code i have suggested...Is it still the same problem? – Geeky Oct 16 '16 at 04:54
Plus I tried your solution on the simple JSON and still doesnt work. – Totallama Oct 16 '16 at 05:04
hey check if this link helps you http://stackoverflow.com/questions/3142495/deserialize-json-into-c-sharp-dynamic-object – Geeky Oct 16 '16 at 05:29

C# - How to retrieve an array from json dynamic object?

2 Answers2