您如何解析没有定义结构的JSON.NET文件？

Question

I'm using an API from OpenCalais that gives me a json string that contains a bunch of JSON objects. The problem is that depending on what I pass into the API the structure of the JSON string changes, which means that I can't cast the deseralization against a custom class I could make. Another problem is that the output isn't in key value form, but rather a complicated object structure. Here is an example of the output-

{"doc":
{"info":
{"allowDistribution":"true",
"allowSearch":"true",
"calaisRequestID":"c1cdd79a-ed89-8431-138c-50e8a37100f9",
"externalID":"17cabs901",
"id":"http://id.opencalais.com/0RCcU306*HTR05*7HlUb5A",
"docId":"http://d.opencalais.com/dochash-1/6188237f-a2a5-3263-95b7-ea894ba98298",
"document":"Bill Gates worked at Microsoft from 2008 to 2011. He is also married to Melinda Gates.",
"docTitle":"",
"docDate":"2012-07-26 15:51:00.885",
"externalMetadata":"",
"submitter":"ABC"}

So you can see there are multiples levels of objects here and there is no key value structure. What I need from this code is essentially all of the name/value info in a dictionary. Then I can sort through based on the keys to the relevant info. It would also be cool if I could somehow also grab the parent of the object value. So for example the output I want is key: allowSearch, value: true, parent: info. I have been trying to mess around with different method of deserialization, dynamic objects, and just plain parsing using functions like .Ancestor and I haven't found anything useful. Any help would be greatly appreciated.

Answer 1

Have you looked at JSON.NET ? It can dynamically parse JSON which you can then iterate through:

using Newtonsoft.Json.Linq;

JObject rootObject = JObject.Parse(jsonString);

You can iterate through the children, or search for other nodes like this:

JToken info = rootObject.SelectToken("info");

Answer 2

Json.NET support LINQ to JSON under the Newtonsoft.Json.Linq namespace.

The example to use JObject

JObject o = JObject.Parse(@"{'CPU': 'Intel','Drives': ['DVD read/writer','500 gigabyte hard drive']}");

string cpu = (string)o["CPU"];
// Intel

string firstDrive = (string)o["Drives"][0];
// DVD read/writer

IList<string> allDrives = o["Drives"].Select(t => (string)t).ToList();
// DVD read/writer
// 500 gigabyte hard drive

Answer 3

You can use DeserializeObject which essentially returns a Dictionary<string, object> .

For example:

JavaScriptSerializer serializer = new JavaScriptSerializer();
Dictionary<string, object> myGraph = (Dictionary<string, object>)serializer.DeserializeObject(myJson);

To read stuff from the myGraph dictionary, you will have to cast each step of the way.

For example:

Dictionary<string, object> doc = (Dictionary<string, object>)myGraph["doc"];
Dictionary<string, object> info = (Dictionary<string, object>)doc["info"];
string externalID = (string)info["externalID"];

I'm sure you could genericize it a bit, but I think that should work with the json you posted.