score:0

var dicvalues = new dictionary<string,string>(); // this dictionary contains key value pair result
dynamic res = jsonconvert.deserializeobject<dynamic>(file.readalltext("data.json");
dynamic availablefields = res["fields"];
if (availablefields != null)
{
    foreach (var field in availablefields)
        dicvalues.add(field.name, field.value["value"].value);
}

score:1

var result = new dictionary<string, string>();
foreach (var field in obj.fields)
{
    result.add(field.name, convert.tostring(field.value.value));
}

score:2

var dict = jobject.parse(file.readalltext("data.json"))["fields"]
           .cast<jproperty>()
           .todictionary(x => x.name, x => (string)x.value["value"]);

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