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How to check the attribute value string from linq in c#

I have a string value in column of database table :-
<Attributes><ProductAttribute ID="322"><ProductAttributeValue><Value>782</Value></ProductAttributeValue></ProductAttribute></Attributes>
There are multiple column with the same format.
Now I need to check ProductAttributeValue and get the data from linQ
currently I am doing by
var id = 782
var string = "<Attributes><ProductAttribute ID="322"><ProductAttributeValue><Value>" + id + "</Value></ProductAttributeValue></ProductAttribute></Attributes>";
var value = sometable.where(x => x.valueString == string).FirstOrDefault();
Is there any way to get direct from linq?

This can be done using LINQ to XML.
using System.Linq;
using System.Xml.Linq;
...
var id = "Value To Find";
var str = "<Attributes><ProductAttribute ID=\"322\"><ProductAttributeValue><Value>" + id + "</Value></ProductAttributeValue></ProductAttribute></Attributes>";
var xml = XDocument.Parse(str);
var val = xml
.Element("Attributes")
.Element("ProductAttribute")
.Element("ProductAttributeValue")
.Element("Value")?.Value;
Since there is only 1 of each element in the xml data structure you can use Element, if there are multiple you can use Elements and operate on them as a collection.
You can filter elements like usual using Where and other extension methods.
var valToFind = "722";
var val = xml
.Element("Attributes")
.Elements("ProductAttribute")
.Where(node => node
.Element("ProductAttributeValue")
?.Element("Value")
?.Value == valToFind
)
.FirstOrDefault();
The above will find the ProductAttribute node that has a ProductAttributeValue Value equal to the valToFind. valToFind is a string for quick comparison against the xml string value.

Sitefinity: Dynamic Content query optimization with field values

I will attempt to be as specific as possible. So we are using Sitefinity 8.1.5800, I have a couple dynamic content modules named ReleaseNotes and ReleaseNoteItems. ReleaseNotes has some fields but no reference to ReleaseNoteItems.
Release Note Items has fields and a related data field to ReleaseNotes.
So I can query all ReleaseNoteItems as dynamic content pretty quickly less than a second.
I then use these objects provided by sitefinity and map them to a C# object so I can use strong type. This mapping process is taking almost a minute and using over 600 queries for only 322 items (N+1).
In Short: I need to get all sitefinity objects and Map them to a usable c# object quicker than I currently am.
The method for fetching the dynamic content items (takes milliseconds):
private IList<DynamicContent> GetAllLiveReleaseNoteItemsByReleaseNoteParentId(Guid releaseNoteParentId)
{
DynamicModuleManager dynamicModuleManager = DynamicModuleManager.GetManager(String.Empty);
Type releasenoteitemType = TypeResolutionService.ResolveType("Telerik.Sitefinity.DynamicTypes.Model.ReleaseNoteItems.Releasenoteitem");
string releaseNoteParentTypeString = "Telerik.Sitefinity.DynamicTypes.Model.ReleaseNotes.Releasenote";
var provider = dynamicModuleManager.Provider as OpenAccessDynamicModuleProvider;
int? totalCount = 0;
var cultureName = "en";
Thread.CurrentThread.CurrentUICulture = new CultureInfo(cultureName);
Type releasenoteType = TypeResolutionService.ResolveType("Telerik.Sitefinity.DynamicTypes.Model.ReleaseNotes.Releasenote");
// This is how we get the releasenote items through filtering
DynamicContent myCurrentItem = dynamicModuleManager.GetDataItem(releasenoteType, releaseNoteParentId);
var myMasterParent =
dynamicModuleManager.Lifecycle.GetMaster(myCurrentItem) as DynamicContent;
var relatingItems = provider.GetRelatedItems(
releaseNoteParentTypeString,
"OpenAccessProvider",
myMasterParent.Id,
string.Empty,
releasenoteitemType,
ContentLifecycleStatus.Live,
string.Empty,
string.Empty,
null,
null,
ref totalCount,
RelationDirection.Parent).OfType<DynamicContent>();
IList<DynamicContent> allReleaseNoteItems = relatingItems.ToList();
return allReleaseNoteItems;
}
This is the method that takes almost a minute that is mapping sitefinity object to C# object:
public IList<ReleaseNoteItemModel> GetReleaseNoteItemsByReleaseNoteParent(ReleaseNoteModel releaseNoteItemParent)
{
return GetAllLiveReleaseNoteItemsByReleaseNoteParentId(releaseNoteItemParent.Id).Select(rn => new ReleaseNoteItemModel
{
Id = rn.Id,
Added = rn.GetValue("Added") is bool ? (bool)rn.GetValue("Added") : false,
BugId = rn.GetValue<string>("bug_id"),
BugStatus = rn.GetValue<Lstring>("bugStatus"),
Category = rn.GetValue<Lstring>("category"),
Component = rn.GetValue<Lstring>("component"),
#Content = rn.GetValue<Lstring>("content"),
Criticality = rn.GetValue<Lstring>("criticality"),
Customer = rn.GetValue<string>("customer"),
Date = rn.GetValue<DateTime?>("date"),
Grouped = rn.GetValue<string>("grouped"),
Override = rn.GetValue<string>("override"),
Patch_Num = rn.GetValue<string>("patch_num"),
PublishedDate = rn.PublicationDate,
Risk = rn.GetValue<Lstring>("risk"),
Title = rn.GetValue<string>("Title"),
Summary = rn.GetValue<Lstring>("summary"),
Prod_Name = rn.GetValue<Lstring>("prod_name"),
ReleaseNoteParent = releaseNoteItemParent,
McProductId = GetMcProductId(rn.GetRelatedItems("McProducts").Cast<DynamicContent>()),
}).ToList();
}
Is there any way to optimize this all into one query or a better way of doing this? Taking almost a minute to map this objects is too long for what we need to do with them.
If there is no way we will have to cache the items or make a SQL query. I would rather not do caching or SQL query if I do not have to.
Thank you in advance for any and all help you can provide, I am new to posting questions on stackoverflow so if you need any additional data please let me know.

Is there a reason why you are doing a .ToList() for the items? Is it possible for you to avoid that. In my opinion, most of the time(of the 1 minute) is taken to convert all your items into a list. Conversion from Sitefinity object to C# object is not the culprit here.

Look Arno's answer here: https://plus.google.com/u/0/112295105425490148444/posts/QrsVtxj1sCB?cfem=1
You can use the "Content links manager" to query dynamic modules relationships (both by parent -ParentItemId- or by child -ChildItemId-) much faster:
var providerName = String.Empty;
var parentTitle = "Parent";
var relatedTitle = "RelatedItem3";
DynamicModuleManager dynamicModuleManager = DynamicModuleManager.GetManager(providerName);
Type parentType = TypeResolutionService.ResolveType("Telerik.Sitefinity.DynamicTypes.Model.ParentModules.ParentModule");
Type relatedType = TypeResolutionService.ResolveType("Telerik.Sitefinity.DynamicTypes.Model.RelatedModules.RelatedModule");
ContentLinksManager contentLinksManager = ContentLinksManager.GetManager();
// get the live version of all parent items
var parentItems = dynamicModuleManager.GetDataItems(parentType).Where(i => i.GetValue<string>("Title").Contains(parentTitle) && i.Status == ContentLifecycleStatus.Live && i.Visible);
// get the ids of the related items.
// We use the OriginalContentId property since we work with the live vesrions of the dynamic modules
var parentItemIds = parentItems.Select(i => i.OriginalContentId).ToList();
// get the live versions of all the schedules items
var relatedItems = dynamicModuleManager.GetDataItems(relatedType).Where(i => i.Status == ContentLifecycleStatus.Live && i.Visible && i.GetValue<string>("Title").Contains(relatedTitle));
// get the content links
var contentLinks = contentLinksManager.GetContentLinks().Where(cl => cl.ParentItemType == parentType.FullName && cl.ComponentPropertyName == "RelatedField" && parentItemIds.Contains(cl.ParentItemId) && cl.AvailableForLive);
// get the IDs of the desired parent items
var filteredParentItemIds = contentLinks.Join<ContentLink, DynamicContent, Guid, Guid>(relatedItems, (cl) => cl.ChildItemId, (i) => i.OriginalContentId, (cl, i) => cl.ParentItemId).Distinct();
// get the desired parent items by the filtered IDs
var filteredParentItems = parentItems.Where(i => filteredParentItemIds.Contains(i.OriginalContentId)).ToList();

I would imagine that every release note item under a single release note would be related to the same product wouldn't it?
If so, do you need to do the GetMcProductId method for every item?

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

Linq-to-xml to get child nodes

I am having trouble identifying how to use linq-to-xml to extract total price and individual prices from the xml below (e.g I want to get the fare price and also sum of all prices). Any help would be much appreciated especially with using the method syntax of linq-to-xml
I use the following code to get the data loaded into an xDocument and work with the xmlResponse object to parse the response.
var xmlResponse = from element in xdoc.Descendants()
select element;
and get data like
xmlResponse.SingleOrDefault(x => x.Name.LocalName == "Registration")
Below is a subset of thwe xml response :-
<StateList>
<State>
<SourceJobID>J999999999999</SourceJobID>
<TargetJobState>Complete</TargetJobState>
<TargetJobID>11111111</TargetJobID>
<TargetSystem>TESTSYSTEM</TargetSystem>
<VehicleDetails>
<Registration>TESTREGISRATION</Registration>
<Plate>11111111111</Plate>
<CO2Rating>160</CO2Rating>
<Badge>1111111</Badge>
<Description>TEST DESCRIPTION</Description>
</VehicleDetails>
<CompleteDetails>
<CompletedOn>2015-09-15T13:39:11+01:00</CompletedOn>
<JobDistance>0</JobDistance>
<WaitingTime />
<CO2Usage>0</CO2Usage>
<ChargeList>
<Charge>
<Name>Airport Pickup</Name>
<Currency>GBP</Currency>
<Price>0.00</Price>
</Charge>
<Charge>
<Name>Fare</Name>
<Currency>GBP</Currency>
<Price>0.00</Price>
</Charge>
<Charge>
<Name>Extra Stops</Name>
<Currency>GBP</Currency>
<Price>0.00</Price>
</Charge>
</ChargeList>
</CompleteDetails>
</State>

Assuming you only have a single state like in your example, you could do something like the following:
decimal fare = decimal.Parse(xml.Descendants("Charge").Single(x => x.Element("Name").Value == "Fare").Element("Price").Value);
decimal total = xml.Descendants("Charge").Sum(x => decimal.Parse(x.Element("Price").Value));
Although if you have a series of elements in your list you will have to modify that.
EDIT: If, as you say in the comments, you would like to sum only certain charges:
// Valid names of charges to sum.
string[] names = { "Airport Pickup", "Fare" };
// Iterate over every state.
foreach (var state in xml.Descendants("State"))
{
// Get all charge elements in the current state whose names are contained in 'names' - then convert their 'Price' element to decimal and sum them.
decimal stateTotal = state.Descendants("Charge").Where(x => names.Contains(x.Element("Name").Value)).Sum(x => decimal.Parse(x.Element("Price").Value));
}

if(doc.Descendants("Charge").Any())
{
var FarePrice = doc.Descendants("Charge")
.Where(x => x.Descendants("Name").First().Value.Equals("Fare")).First().Element("Price").Value;
var Sum = doc.Descendants("Charge")
.Select(x => Convert.ToDouble(x.Descendants("Price").First().Value))
.Sum();
Console.WriteLine("Fare price:{0} Sum:{1}",FarePrice,Sum);
}
It returns 35 as sum for 10 and 25 inputs.
Fiddle here : https://dotnetfiddle.net/cuHXBn

How to write XPath expression to select node name from its value

I'm trying to write an XPath expression to select the name of a node from its value in "qualities" and then select in "qualityNames" the value inside node whose name has previously captured.
E.g. In "qualities" - got value "4", take name "rarity3" then in "qualityNames" I got node named "rarity3" and take value "amazingrarity"
<result>
<status>1</status>
<qualities>
<Normal>0</Normal>
<rarity1>1</rarity1>
<rarity2>2</rarity2>
<vintage>3</vintage>
<rarity3>4</rarity3>
<rarity4>5</rarity4>
</qualities>
<qualityNames>
<Normal>Normal</Normal>
<rarity1>Genuine</rarity1>
<rarity2>rarity2</rarity2>
<vintage>Vintage</vintage>
<rarity3>amazingrarity</rarity3>
<rarity4>Unusual</rarity4>
</qualityNames>
</result>
I'm doing this in C# (It's a MVC App) and I'd prefer to use XPath because I'm indexing the XML and I haven't found a fastest way to query in-memory technique (this XML file has ~3MB and I'm using IndexingXPathNavigator).

Use the local-name() and text() functions + predicates. For value "4" it will be
//qualityNames/*[local-name()=local-name(//qualities/*[text() = '4'])]
Tested with http://www.xpathtester.com

Sounds like you want to create a dictionary of key/value pairs (assuming the node names are only needed to find matches and aren't important to your code).
If so, you can use the following:
var doc = XElement.Parse(#"<result>
<status>1</status>
<qualities>
<Normal>0</Normal>
<rarity1>1</rarity1>
<rarity2>2</rarity2>
<vintage>3</vintage>
<rarity3>4</rarity3>
<rarity4>5</rarity4>
</qualities>
<qualityNames>
<Normal>Normal</Normal>
<rarity1>Genuine</rarity1>
<rarity2>rarity2</rarity2>
<vintage>Vintage</vintage>
<rarity3>amazingrarity</rarity3>
<rarity4>Unusual</rarity4>
</qualityNames>
</result>");
var query = from quality in doc.XPathSelectElements("qualities/*")
join qualityName in doc.XPathSelectElements("qualityNames/*")
on quality.Name equals qualityName.Name
select new { Key = quality.Value, Value = qualityName.Value };
var qualities = query.ToDictionary(a => a.Key, a => a.Value);
var quality3 = qualities["3"];
// quality3 == "Vintage"
var quality4 = qualities["4"];
// quality4 == "amazingrarity"
EDIT: example of how to cache this dictionary
// add reference to System.Web dll
public Dictionary<string, string> GetQualities()
{
// assuming this code is in a controller
var qualities = this.HttpContext.Cache["qualities"] as Dictionary<string, string>;
if (qualities == null)
{
// LoadQualitiesFromXml() is the code above
qualities = LoadQualitiesFromXml();
this.HttpContext.Cache["qualities"] = qualities;
}
return qualities;
}

I think this is what you asked
var rarity3ValueInQualities = xml.SelectSingleNode("/result/qualities/rarity3").InnerText;
var rarity3ValueInqualityNames = xml.SelectSingleNode("/result/qualityNames/rarity3").InnerText;