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Getting the values from this specific JSON

I'm trying to get all of the "last" values from this JSON here:
{"btc":{
"usd": {
"bitfinex": {
"last": "1191.60",
"volume": "1.99324e+7"
},
"bitstamp": {
"last": "1193.06",
"volume": "8.73693e+6"
},
"btce": {
"last": "1174.27",
"volume": "6.03521e+6"
}
}
}
But for some reason I can only access "btc" and "usd". I can't get anything out of it including the "last" values. Here is the code i'm using:
private string GetPrice()
{
WebClient wc = new WebClient();
var data = wc.DownloadString("http://preev.com/pulse/units:btc+usd/sources:bitfinex+bitstamp+btce");
JObject o = JObject.Parse(data);
string response = o["btc"].ToString();
return response;
}
If I change it to:
o["last"].ToString();
It just doesn't return anything. Can someone please provide me with a solution? I also tried making a key/value dict out of it and looping over each pair. Did not work.

The JObject structure is similar to a class with properties, so the first-level indexer ["btc"] returns another object that you have to query for its own properties ["usd"]
You can also opt for using JObject.SelectToken, generally not a bad idea. Other answers have shown how to chain the indexers but that's hard to read and maintain. Instead you can do:
jObj.SelectToken("btc[0].usd[0].bitstamp[0].last").ToString();
Further you can use the power of this syntax for other queries:
// a list o all the 'last' values
jObj.SelectTokens("btc.usd.*.last").Select(t=>t.ToString()).ToList();
Another advantage, if you're building a more complex system, is that you could put the queries in a config file or attributes etc to make them more manageable or deploy logic changes without rebuilding.
Yet another approach would be to build your own class structure and deserialize your json into it, so you have strongly typed values (double instead of string for the values for example)
public class btc {
public usd usd {get;set;}
}
public class usd....
var btcLoaded = JsonConvert.DeserializeObject<btc>(jsonString);
var lastBitstamp = btc.usd.bitstamp.last;

Use: o["btc"]["usd"]["bitfinex"]["last"].ToString() to get the 'last' value of 'bitfinex'.

After parsing the JSON whenever you index the o variable you are indexing from the root of the JSON. In order to access nested properties like 'last' you will need to index into the next level of the JSON as such:
var bitfinex = o["btc"]["usd"]["bitfinex"]["last"].ToString();
var bitstamp = o["btc"]["usd"]["bitstamp"]["last"].ToString();
var btce = o["btc"]["usd"]["btce"]["last"].ToString();
To reduce the repetition you could iterate over the properties under the btc.usd field.

if u want to all last values use this..
decimal[] lastValues = obj.SelectTokens("$..last").ToArray()
.Select(a => a.Parent.ToObject<decimal>()).ToArray();
if u want to dictionary, use this..
var dictionary = obj["btc"]["usd"].Select(a =>
new
{
Key = ((JProperty)a).Name,
Value = a.First["last"].ToObject<decimal>()
})
.ToDictionary(a => a.Key, a => a.Value);

c# Json reading child object

I am trying to read child elements in the Json object below. Below is the Json example. I want to read RecommendedCount and TotalReviewCount in testdata1, testdata2 and testdata3.
{
"HasErrors": false,
"Includes": {
"test ": {
"testdata1": {
"ReviewStatistics": {
"RecommendedCount": 0,
"TotalReviewCount": 2
}
},
"testdata2": {
"ReviewStatistics": {
"RecommendedCount": 0,
"TotalReviewCount": 2
}
},
"testdata3": {
"ReviewStatistics": {
"RecommendedCount": 0,
"TotalReviewCount": 2
}
}
}
}
}
I tried the code below.
RecommendedCount = apiResponse.Includes.Products[key].ReviewStatistics.RecommendedCount,
TotalReviewCount = apiResponse.Includes.Products[key].ReviewStatistics.TotalReviewCount
But this is very slow as the Json response has more than 1000 lines so it is taking time. I want to know is there any linq i can use to find the relevant data or any other methods i can use?
Thanks in advance.
var jObj = (JObject)JsonConvert.DeserializeObject(rawJson);
foreach (var child in jObj["test"].Children())
{
}
The above is the deserialize code i am trying to use but getting Object reference not set to an instance of an object. error

My solution:
JObject obj = JObject.Parse(jsonString);
var recList= obj.SelectTokens("$..ReviewStatistics.RecommendedCount").ToList();
var totalList= obj.SelectTokens("$..ReviewStatistics.TotalReviewCount").ToList();
Then you can get the data that you want. For example, if you want RecommendedCount from testdata2, you do like this
var dataYouWant = (int)recList[1];
References:
http://www.newtonsoft.com/json/help/html/LINQtoJSON.htm
Deserializing JSON to .NET object using Newtonsoft (or LINQ to JSON maybe?)
https://msdn.microsoft.com/en-us/library/cc197957(v=vs.95).aspx
If there is anything wrong, please feel free to correct my answer. Thanks!

I suspect the problem is in your Json you have a space in the field "test " which is causing a null reference exception.
I'm not entirely sure whether is it copy paste mistake or your getting Json string in this format.
Check this working code on removing the space.

C# - JObject.Parse - Invalid JSON

I'm working with an API that is returning JSON.
I have a method that calls the api, and parses the JSON response for the desired nodes.
Up to this point everything has been working fine, except the latest JSON response appears to be malformed.
Other responses come back like:
{
"Keyword":"\"marhope\"",
"TermKey":null,
"Customers":[
{
"Memberships":[ ],
"CompanyId":0,
"ObjectId":112974,
"ObjectType":"Customer",
}
]
}
I use JObject.Parse to bring back the appropriate nodes by name.
The latest JSON response comes back as:
{
[
{
"AnimalId":9079117,
"SpeciesCode":"XX",
}
]
}
As you can see, there is no "name", and the JSON is slightly invalid.
How can I parse this. For the first example I was using the code below, but now that the JSON has no "name", I don't know how to approach this, thoughts?
JObject results = JObject.Parse(csr.SearchCustomer(1, 1, 870, term));
foreach (var resp in results["Customers"])
{
string obj = (string)resp["CompanyId"];
}

Jon Skeet is correct, the second JSON is invalid: you cannot have an array directly inside an object with no property name. The best course of action is to get the API developers to fix the JSON. However, if you're just looking for a quick and dirty workaround, you could strip off the the first and last brace from the invalid JSON and then parse it as an array using JArray.Parse.
string json = #"{
[
{
""AnimalId"":9079117,
""SpeciesCode"":""XX"",
}
]
}";
json = json.Substring(1, json.Length - 2);
JArray array = JArray.Parse(json);
foreach (JObject item in array.Children<JObject>())
{
Console.WriteLine("AnimalId: " + item["AnimalId"]);
Console.WriteLine("SpeciesCode: " + item["SpeciesCode"]);
}

converting graph api for xml

I'm having trouble converting a string of json facebook graph api, I used the facebook C# and json.Net.
But at conversion time it returns this error: Name can not begin with the '0 'character, hexadecimal value 0x30.
This is the code:
dynamic result = await _fb.GetTaskAsync ("me / feed");
FBxml JsonConvert.DeserializeXNode string = (result.ToString ()). ToString ();

It looks like there is a problem with portion of the json string as mentioned below (taken from your link http://jsfiddle.net/btripoloni/PaLC2/)
"story_tags": {
"0": [{
"id": "100000866891334",
"name": "Bruno Tripoloni",
"offset": 0,
"length": 15,
"type": "user"}]
},
Json cannot create class that begins with a numeric value such as '0'. Try creating the classes using the link http://json2csharp.com/ you will get an idea.
To solve this problem you can create a dynamic object and go through each properties OR create a JsonConverter and write your code in the ReadJson to convert the "0" to a meaningful name. May be this can help you http://blog.maskalik.com/asp-net/json-net-implement-custom-serialization
If this is not your problem then update the question with more information like class structure of FBxml, call stack of the exception (from which line of the json code is throwing the exception), Json version etc.

As keyr says, the problem is with those JSON properties that have numeric names. In XML names can contain numeric characters but cannot begin with one: XML (see the Well-formedness and error-handling section).
My idea was to recursively parse the JSON with JSON.Net, replacing properties that had numeric names:
var jsonObject = JObject.Parse(json);
foreach (var obj in jsonObject)
{
Process(obj.Value);
}
XDocument document = JsonConvert.DeserializeXNode(jsonObject.ToString());
....
private static void Process(JToken jToken)
{
if (jToken.Type == JTokenType.Property)
{
JProperty property = jToken as JProperty;
int value;
if (int.TryParse(property.Name, out value))
{
JToken token = new JProperty("_" + property.Name, property.Value);
jToken.Replace(token);
}
}
if (jToken.HasValues)
{
//foreach won't work here as the call to jToken.Replace(token) above
//results in the collection modifed error.
for(int i = 0; i < jToken.Values().Count(); i++)
{
JToken obj = jToken.Values().ElementAt(i);
Process(obj);
}
}
}
This seemed to work well, prefixing numeric names with _. At this line:
XDocument document = JsonConvert.DeserializeXNode(jsonObject.ToString());
it crashed with an error saying that invalid/not well formed XML had been created. I don't have the actual error with me, but you can run the above code to replicate it.
I think from here you may need to revisit converting the JSON to XML in the first place. Is this a specific requirement?

c# dynamic json objects with dynamic names question

Before I get flagged for duplicate, I have the code from Dynamic json object with numerical keys working quite well now. The question with my numeric keys is that unfortunately, the JSON string I am getting is initially delimited by year, so would I use reflection to attempt to create a dynamic property on a dynamic object, and if so how? I know with a dynamic object I can't have obj["2010"] or obj[0]. In JavaScript this is no problem, just trying to get it working in C#. Ideas?
Example of JSON being returned:
{
"2010": [
{
"type": "vacation",
"alloc": "90.00"
},
Alternatively, sometimes the year is the second element as such:
I have no control over this json.
{
"year": [],
"2010": [
{
"type": "vacation",
"alloc": "0.00"
},

Maybe I'm misunderstanding your question, but here's how I'd do it:
static void Main(string[] args) {
var json = #"
{
'2010': [
{
'type': 'vacation',
'alloc': '90.00'
},
{
'type': 'something',
'alloc': '80.00'
}
]}";
var jss = new JavaScriptSerializer();
var obj = jss.Deserialize<dynamic>(json);
Console.WriteLine(obj["2010"][0]["type"]);
Console.Read();
}
Does this help?
I wrote a blog post on serializing/deserializing JSON with .NET: Quick JSON Serialization/Deserialization in C#

I have up-voted the question and JP's answer and am glad I dug around the internet to find this.
I have included a separate answer to simplify my use case for others to benefit from. The crux of it is:
dynamic myObj = JObject.Parse("<....json....>");
// The following sets give the same result
// Names (off the root)
string countryName = myObj.CountryName;
// Gives the same as
string countryName = myObj["CountryName"];
// Nested (Country capital cities off the root)
string capitalName = myObj.Capital.Name;
// Gives the same as
string capitalName = myObj["Capital"]["Name"];
// Gives the same as
string capitalName = myObj.Capital["Name"];
Now it all seems quite obvious but I just did not think of it.
Thanks again.