C＃的.NET Json序列化异常

Question

I'm using JSON.net in C# for an Excel VSTO Add in and pulling in JSON via web service.

I have verified the JSON I pull is valid (online JSON Validator) but am unable to convert the JSON into Objects in C# to use.

When I run the code below I get the exception below.

Any ideas on who I can covert the JSON correctly?

Exception:

Newtonsoft.Json.JsonSerializationException: 

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'Bliss.Ribbon1+RootObject[]' 
because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type 
(e.g. not a primitive type like integer, not a collection type like an array or List<T>) 
that can be deserialized from a JSON object. 
JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.

Code:

public async Task<string> getline()
{
  <--- Set Client, Execute Request --->

  //JSON content shown below
  string content = await response.Content.ReadAsStringAsync();

  RootObject[] dims = JsonConvert.DeserializeObject<RootObject[]>(content);

  return content;
}

public class RootObject
{
  public List<string> ledger { get; set; }
  public List<string> ledgerAlias { get; set; }
  public List<string> entity { get; set; }
  public List<string> entityAlias { get; set; }
  public List<string> scenario { get; set; }
  public List<string> period { get; set; }
  public List<string> location { get; set; }
  public List<string> measures { get; set; }
}

JSON:

{
 "acc":["A","B"],
 "accAlias":["ACE","BCE"],
 "company":["PEP", "KO"],
 "companyAlias":["Pepsi", "Coco-Cola"],
 "scenario":["Sales", "Expenses"],
 "year": ["2016","2017"],
 "areaCode":["123","131","412"],
 "clients":["32340-0120","3031-0211","3412-0142"]
}

Answer 1

The JSON represents a single instance of the object, not an array. So instead of this:

RootObject[] dims = JsonConvert.DeserializeObject<RootObject[]>(content)

use this:

RootObject dims = JsonConvert.DeserializeObject<RootObject>(content)

Conversely, if it should be an array, make the JSON itself an array (containing a single element) by surrounding it with brackets:

[{
 "acc":["A","B"],
 "accAlias":["ACE","BCE"],
 "company":["PEP", "KO"],
 "companyAlias":["Pepsi", "Coco-Cola"],
 "scenario":["Sales", "Expenses"],
 "year": ["2016","2017"],
 "areaCode":["123","131","412"],
 "clients":["32340-0120","3031-0211","3412-0142"]
}]

---

Edit: As others have also been pointing out, the properties on the JSON object don't actually match that class definition. So while it may "successfully" deserialize, in doing so it's going to ignore the JSON properties it doesn't care about and initialize to default values the class properties.

Perhaps you meant to use a different class? Or different JSON? Or rename one or more properties in one or the other?

Either way, the difference between a single instance and an array of instances is the immediate problem. But in correcting that problem you're going to move on to this next one.

Answer 2

The RootObject and the json are not compatible. You could deserialize using a dictionary. Try this:

var dims = JsonConvert.DeserializeObject<Dictionary<string, string[]>>(content);