Cannot deserialize Json file to a list of KeyValuePair with string "key"

Question

I have hard time deserializing the json response from Solr search engine.

I use Newtonsoft Json.NET.

Simplified response from Solr:

{
   "suggestions": [
      {
         "someword": {
            "numFound": 1
         }
      }
   ]
}

I deserialize this to a list of KeyValuePair<string, customobject>.

customobject test = Newtonsoft.Json.JsonConvert.DeserializeObject<customobject>(jsonText);

It worked, until a user typed the word "key", so Solr returned that JSON:

{
   "suggestions": [
      {
         "key": {
            "numFound": 1
         }
      }
   ]
}

The deserialization of this JSON raise this error :

Unexpected character encountered while parsing value

... Ok. I just realized that even if it doesn't raise an exception with words other than "key", it doesn't work because the KeyValuePair in the output object are always empty.

I had never realized this problem before because this part of the Json (Spellcheck Suggestions) is never used.

So easy fix: we do not serialize suggestions anymore.

But, if anyone still want to answer the question, in what kind of object will you deserialize this Json (from Solr)?

{
    "suggestions":
    [
      {"brack":{
        "numFound":10,
        "startOffset":0,
        "endOffset":5,
        "origFreq":0,
        "suggestion":[{
            "word":"back",
            "freq":78},
          {
            "word":"black",
            "freq":1}
          ]}},
      {"key":{
        "numFound":1,
        "startOffset":6,
        "endOffset":9,
        "origFreq":12,
        "suggestion":[{
            "word":"key",
            "freq":15}]}}]
}

I don't think a dictionary can do the job :

Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'System.Collections.Generic.Dictionary`2[System.String,Test.SpellCheckSuggestion]' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.

What if you try to deserialize it to a Dictionary<string, customobject>? Dictionary should be a collection of key/value pairs with unique keys — mororo
– mororo, Commented Aug 23, 2019 at 14:09
Please include the code for CustomObject and the code you're using to deserialize. — P. Roe
– P. Roe, Commented Aug 23, 2019 at 14:54
@Dan can you post a more complete example, including your CustomObject? — ivcubr
– ivcubr, Commented Aug 23, 2019 at 17:05
I deserialize this to a list of KeyValuePair<string, customobject> - then please edit your question to provide a minimal reproducible example that demonstrates the problem by including your data model. See How to Ask. public List<Dictionary<string, Result>> Suggestions { get; set; } works fine for all JSON shown in your question, see dotnetfiddle.net/e8uEiC so I can't reproduce your issue. — dbc
– dbc, Commented Aug 23, 2019 at 19:05
@dbc - Thanks for your help! I marked this question as answered. — Dan
– Dan, Commented Aug 27, 2019 at 12:24

Dan · Accepted Answer · 2019-08-27 12:20:15Z

0

As mentioned in a comment above, the solution is to use a list of dictionary. (not just a dictionary and not a list of KeyValuePair)

List<Dictionary<string, SpellCheckSuggestion>>

answered Aug 27, 2019 at 12:20

Dan

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