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selecting the first 2 FIELDS in a JSON OBJECT

I have some JSON that looks like this:
{
"innerObj1": {
"1. Information": "unimportant"
},
"innerObj2": {
"2017-09-19 16:00:00": {
"number1": "75.4500"
},
"2017-09-19 15:55:00": {
"number2": "75.4200"
}
}
}
Not sure why innerObj2 is not returned as an array (this is from an api) but I have to get number1 and number2 returned as an array of strings. Note that 2017-09-19 16:00:00 and 2017-09-19 15:55:00 are subject to change, so I can't hardcode the selection of those objects in C#. I was thinking of possibly using LINQ, but I'm not sure how. I've really only used them with JSON arrays.

Assuming you are using Json.Net, you can get the values of the innermost properties into an array like this, without needing to know the names of them:
JObject obj = JObject.Parse(json);
string[] numbers = ((JObject)obj["innerObj2"]).Properties()
.SelectMany(jp => ((JObject)jp.Value).Properties())
.Select(jp => (string)jp.Value)
.ToArray();
Fiddle: https://dotnetfiddle.net/5sLy6M
Or, a simpler alternative which does the same thing using SelectTokens with a JSONPath wildcard expression:
string[] numbers = obj.SelectTokens("innerObj2.*.*")
.Select(jt => (string)jt)
.ToArray();
Fiddle: https://dotnetfiddle.net/CyRQ9T

Sort List by date values

I have the following list -
List<string> finalMessageContent
where
finalMessageContent[0] = "<div class="mHr" id="mFID">
<div id="postedDate">11/12/2015 11:12:16</div>
</div>" // etc etc
I am trying to sort the list by a particular value located in the entires - postedDate tag.
Firstly I have create an new object and then serialized it to make the html elements able to be parsed -
string[][] newfinalMessageContent = finalMessageContent.Select(x => new string[] { x }).ToArray();
string json = JsonConvert.SerializeObject(newfinalMessageContent);
JArray markerData = JArray.Parse(json);
And then used Linq to try and sort using OrderByDescending -
var items = markerData.OrderByDescending(x => x["postedDate"].ToString()).ToList();
However this is failing when trying to parse the entry with -
Accessed JArray values with invalid key value: "postedDate". Array position index expected.
Perhaps linq is not the way to go here however it seemed like the most optimised, where am I going wrong?

First, i would not use string methods, regex or a JSON-parser to parse HTML. I would use HtmlAgilityPack. Then you could provide such a method:
private static DateTime? ExtractPostedDate(string inputHtml, string controlID = "postedDate")
{
var doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(inputHtml);
HtmlNode div = doc.GetElementbyId(controlID);
DateTime? result = null;
DateTime value;
if (div != null && DateTime.TryParse(div.InnerText.Trim(), DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out value))
result = value;
return result;
}
and following LINQ query:
finalMessageContent = finalMessageContent
.Select(s => new { String = s, Date = ExtractPostedDate(s) })
.Where(x => x.Date.HasValue)
.OrderByDescending(x => x.Date.Value)
.Select(x => x.String)
.ToList();

Don't know if I get your question right.
But did you know that you can parse HTML with XPath?
foreach (var row in doc.DocumentNode.SelectNodes("//div[#id="postedDate"]"))
{
Console.WriteLine(row.InnerText);
}
this is just an example from the top of my head you might have to double-check the XPath query depending on your document. You can also consider converting it to array or parsing the date and do other transformations with it.
Like I said this is just from the top of my head. Or if the html is not so compley consider to extract the dates with an RegEx but this would be a topic for another question.
HTH

Json Serializer serializes JSON typed strings. Example here to json
To parse HTML I suggest using HtmlAgility https://htmlagilitypack.codeplex.com/
Like this:
HtmlAgilityPack.HtmlDocument htmlparsed = new HtmlAgilityPack.HtmlDocument();
htmlParsed.LoadHtml(finalMessageContent[0]);
List<HtmlNode> OrderedDivs = htmlParsed.DocumentNode.Descendants("div").
Where(a => a.Attributes.Any(af => af.Value == "postedDate")).
OrderByDescending(d => DateTime.Parse(d.InnerText)); //unsafe parsing

How to parse nested elements using LINQ to XML

I have an XML file with multiple checkItem elements. I need to save each checkItem element into a database. I'm having a difficult time getting exactly what I need using the query below.
<checkItem>
<checkItemType>check</checkItemType>
<checkAmount>195000</checkAmount>
<nonMICRCheckData>
<legalAmount>195000</legalAmount>
<issueDate>2010-04-30</issueDate>
<other>PAY VAL 20 CHARACTER</other>
</nonMICRCheckData>
<postingInfo>
<date>2013-05-01</date>
<RT>10108929</RT>
<accountNumber>111111111</accountNumber>
<seqNum>11111111</seqNum>
<trancode>111111</trancode>
<amount>195000</amount>
<serialNumber>1111111</serialNumber>
</postingInfo>
<totalImageViewsDelivered>2</totalImageViewsDelivered>
<imageView>
<imageIndicator>Actual Item Image Present</imageIndicator>
<imageViewInfo>
<Format>
<Baseline>TIF</Baseline>
</Format>
<Compression>
<Baseline>CCITT</Baseline>
</Compression>
<ViewSide>Front</ViewSide>
<imageViewLocator>
<imageRefKey>201305010090085000316000085703_Front.TIF</imageRefKey>
<imageFileLocator>IFTDISB20130625132900M041.zip</imageFileLocator>
</imageViewLocator>
</imageViewInfo>
<imageViewInfo>
<Format>
<Baseline>TIF</Baseline>
</Format>
<Compression>
<Baseline>CCITT</Baseline>
</Compression>
<ViewSide>Rear</ViewSide>
<imageViewLocator>
<imageRefKey>201305010090085000316000085703_Rear.TIF</imageRefKey>
<imageFileLocator>IFTDISB20130625132900M041.zip</imageFileLocator>
</imageViewLocator>
</imageViewInfo>
</imageView>
</checkItem>
Here is the query I've been working with. I've tried several different ways with no luck. Without the use of .Concat, I cannot get the other elements; however, using .Concat does not allow me to get all values in a manageable format. I need to separate the Front and Rear imageViews based on the ViewSide value, and only need the imageRefKey and imageFileLocator values from the imageView element. Can anyone point me in the right direction?
var query = doc.Descendants("checkItem")
//.Concat(doc.Descendants("postingInfo"))
//.Concat(doc.Descendants("imageViewLocator"))//.Where(x => (string)x.Element("ViewSide") == "Front"))
//.Concat(doc.Descendants("imageViewInfo").Where(x => (string)x.Element("ViewSide") == "Rear"))
.Select(x => new {
CheckAmount = (string) x.Element("checkAmount"),
ImageRefKey = (string) x.Element("imageRefKey"),
PostingDate = (string) x.Element("dare"),
//FrontViewSide = (string) x.Element("ViewSide"),
//RearViewSide = (string) x.Element("BViewSide")
});

You can easily get nested elements of any XElement by just calling the Elements() method of that instance, then calling Select() on that collection, to created a nested collection of an anonymous type in your main anonymous type.
var query = doc.Elements("checkItem")
.Select( x =>
new
{
CheckAmount = (string) x.Element("checkAmount"),
ImageRefKey = (string) x.Element("imageRefKey"),
PostingDate = (string) x.Element("dare"),
ImageViews = x.Element("ImageView").Elements("ImageViewInfo")
.Select(iv=>
new
{
Format = iv.Element("Format").Element("Baseline").Value
// more parsing here
}
}

find element in xml, and take other element value

My xml look like:
<CURRENCIES>
<LAST_UPDATE>2014-01-17</LAST_UPDATE>
<CURRENCY>
<NAME>Dollar</NAME>
<UNIT>1</UNIT>
<CURRENCYCODE>USD</CURRENCYCODE>
<COUNTRY>USA</COUNTRY>
<RATE>3.489</RATE>
<CHANGE>-0.086</CHANGE>
</CURRENCY>
</CURRENCIES>
I want to find specific currncy from the element "NAME" and "COUNTRY", and take the value "RATE".
I wrote:
public void ConvertCurrency(int value, string currency)
{
WebClient webClient = new WebClient();
XDocument xml = new XDocument();
webClient.DownloadFile("http://www.boi.org.il/currency.xml", #"currency.xml");
XDocument currency_xml = XDocument.Load("currency.xml");
var findCurrency = from currency1 in currency_xml.Descendants("CURRENCIES")
where (Convert.ToString(currency1.Element("CURRENCY").Element("NAME").Value) == currency) && (Convert.ToString(currency1.Element("CURRENCY").Element("COUNTRY").Value) == "USA")
select currency1.Element("RATE").Value;
int rate = Convert.ToInt32(findCurrency);
int result = value * rate;
Console.WriteLine("Result:{0}",result);
}
How can I do it right?

Your query is over CURRENCIES elements, and you're only looking at the first CURRENCY child. Then you're looking for a RATE child within CURRENCIES rather than CURRENCY. Additionally, you're getting a sequence of integers - and that isn't a single int. I think you want:
// Load directly from the web - it's simpler...
XDocument doc = XDocument.Load("http://www.boi.org.il/currency.xml");
var element = doc.Root
.Elements("CURRENCY")
.Where(x => (string) x.Element("COUNTRY") == "USA") &&
(string) x.Element("NAME") == currency)
.FirstOrDefault();
if (element != null)
{
// You don't want an int here - you shouldn't lose information!
decimal rate = (decimal) element.Element("RATE");
decimal result = value * rate;
Console.WriteLine("Result: {0}", result);
}
else
{
Console.WriteLine("Couldn't find currency rate for USA");
}
Notes:
I haven't used a query expression here as it wouldn't help to simplify anything
This will fail if there's a CURRENCY element for USA without a RATE element; do you need to fix that?
I prefer to use the user-defined conversions in XElement instead of using Convert.ToXyz; they're specifically geared up for XML values (so won't use the culture when converting decimal values, for example)

Jon Skeet's answer is complete, anyway here is your fixed query with LINQ syntax
var findCurrency = (from c in currency_xml.Descendants("CURRENCY")
where (string)c.Element("NAME") == currency
&& (string)c.Element("COUNTRY") == "USA"
select (string)c.Element("RATE")).FirstOrDefault();

c# xml parsing - conversion from php

I currently have my application/project setup on PHP and I am trying to get it working in c# so I can build an application around it.
I have come across some parts of the code which I am looking help with.
XML data from: http://api.eve-central.com/api/marketstat?usesystem=30000142&hours=48&typeid=34&typeid=456
Above is XML data from a certain system containing 2 typeids (same as the other XML), again this will be around 100 items at a time.
I am using this code at the moment:
XDocument doc = XDocument.Load("http://api.eve-central.com/api/marketstat?typeid=34&typeid=35&usesystem=30000142");
var id = from stats in doc.Root.Elements("marketstat")
from type in stats.Elements("type")
select new
{
typeID = type.Attribute("id").Value
};
foreach (var itemids in id)
{
kryptonListBox4.Items.Add(itemids.typeID);
};
Which populates the ListBox as 34 and 456.
What I need is to be able to add the other xml data such as min sell and max buy
I can get the first min sell like this:
string minSell = doc.Descendants("sell")
.First()
.Element("min")
.Value;
But I need to have the minsell in relation to the typeID and being able to work with the data.
Second Problem
XML data from http://api.eve-marketdata.com/api/item_history2.xml?char_name=demo&days=10&region_ids=10000002&type_ids=34,456
Above is XML data from a certain region and contains 2 type_ids (this will be a much larger list when completed around 100 items at a time).
I have tried to use similar code as above but I cannot get it to return the correct data.
I need to be able to get the volume in total for each typeid
In PHP I use this:
foreach ($xml -> result -> rowset-> row as $row)
{
$id = (string)$row['typeID'];
$volume = $row['volume'];
if (!isset($volumes[$id]))
{
$volumes[$id] = 0;
}
$volumes[$id] = $volumes[$id] + $volume;
}
Any help would be greatly appreciated!
//Edit: Looks like I can use
var vRow = from xmlRow in marketstats.Descendants("emd").Descendants("result").Descendants("rowset").Descendants("row")
select xmlRow;
for the 2nd problem but I cannot seem to get the multidimensional array to work

For your second problem if my understanding is right this will be close to ur need.
var strxml = File.ReadAllText(#"D:\item_history2.xml");
var xml = XElement.Parse(strxml);
var typeIDs = (from obj in xml.Descendants("row")
select obj).Select(o => o.Attribute("typeID").Value).Distinct();
Dictionary<string, long> kv = new Dictionary<string, long>();
foreach (var item in typeIDs)
{
var sum = (from obj in xml.Descendants("row")
select obj).Where(o => o.Attribute("typeID").Value == item).Sum(p => long.Parse(p.Attribute("volume").Value));
kv.Add(item, sum);
}
In the dictionary you will have the sum of volumes against each typeID in such a way
typeID as key and sum of volume as value in Dictionary kv.
For your first problem,
Checkout this,
var minsell = (from obj in xml.Descendants("type")
select new
{
typeid = obj.Attribute("id").Value,
minsell = obj.Descendants("sell").Descendants("min").FirstOrDefault().Value
}
).ToArray();
This will give you minsell value in relation with typeid.
I guess this what you expects ?
If wrong please comment it.