XElement query

XElement Class (System

c# - How to use a LINQ query to get XElement values when

  1. ate the possibility of bugs and other small mistakes. It is part of the LINQ extensions in System.Xml.Linq. Intro notes. We can use XElement to load (and query) an XML document. Less custom code is required with XElement, although performance will suffer.
  2. C# (CSharp) System.Xml.Linq XElement - 30 examples found. These are the top rated real world C# (CSharp) examples of System.Xml.Linq.XElement extracted from open source projects. You can rate examples to help us improve the quality of examples
  3. There are two ways to do so: Using the XElement class or the XDocument class. Both the classes contain the 'Load()' method which accepts a file, a URL or XMLReader and allows XML to be loaded. I need to query for student element for rollno=some value. Comment posted by Joop Hooymans on Thursday, February 14, 2013 12:24 PM Thank you for.

private static XElement ElementByName(XElement parent, string name) { // Use FirstOrDefault() or another selector to find the relevant element return parent.Descendants(name).FirstOrDefault(); } Usage Sometimes you might have to write a query that selects elements based on their context. For example, you might want to filter based on preceding or following sibling elements, or on child or ancestor elements. You can do this by writing a query and using the results of the query in the where clause. If you have to first test against null, and. Questions: I have an XDocument object. I want to query for elements with a particular name at any depth using LINQ. When I use Descendants(element_name), I only get elements that are direct children of the current level. What I'm looking for is the equivalent of //element_name in XPathshould I just use XPath, or is there.

XElement class overview Microsoft Doc

  1. The XElement object representing the matching node is then yield returned to the LINQ query. As the query continues to execute, and LINQ needs to continue scanning the input sequence for additional elements, the StreamElements custom iterator method continues execution right after the point at which it yield return ed the previous element.
  2. How to convert linq query to a list of string my code is given below. C#. public static List<string> checksum The Descendents are XElement instances, not strings, so you need to Select the Value property in order to get strings: C#
  3. The code builds, but when I run it it just gives me the type of the node (System.Linq.Enumerable+<SelectIterator>d__d'2[System.Xml.Linq.XElement,System.String]) instead of the value contained in it. I haven't really worked with traversing XML nodes before (maybe twice), and I'm totally new to using Linq to XML, and I'm probably missing.
  4. g interface that lets the developers use LINQ (Language Integrated Query) to manage XML data. It simplifies a lot of XML data manipulation procedures, for example.
  5. Hi @all! I want to create a dynamic query with linq to xml, but for now, i have not found anything useful. I hope you can help! My xml looks like that and i want to select evey product wiht a special color and/or a special name. There are a lot more filters, which the user can select: <Produkt> < · Hi Mel Several things are causing this query to fail.
  6. Integration to LINQ allows for querying XML elements similarly as it does with all the other object collections that implement IEnumerable interface. In addition to advanced querying, LINQ to XML enables using query results as a parameter to XElement and XAttribute object constructors which provides easy XML data and structure manipulation
  7. Hi Ashish Thanks this is a good article but when I used to access the XML through LINQ Query and I used XNamespace then I face exception like char( : ) cannot be used in name. Actually I was trying to read RSS in XML format there are some tags are populated with name space

XLinq is an XML query language that inherits from the LINQ query foundation. You can use it to query XLinq objects such as XElement, XDocument, etc using LINQ query facilities. Performing a Simple Query I would like to be able to access any or all of the element values in the Property node by using a similar construct that will capture them in a single LINQ to XML query, but not sure how to do it. IOW, I would create an object from the query that can do something like XElement queries = new XElement(queries); queries.Elements(query).Elements(reqName).SetValue(x); Please help us improve this community forum for visitors by marking the replies as answers if they help and unmarking them if they provide no help The XElement Class. The XElement class represents an XML element with a Name property of the type XName. The XName class is composed of a local name and a namespace. Optionally, XElement can contain XML attributes of type XAttribute, derives from XContainer, and inherits the members of XContainer, XNode, and XObject LINQ to Objects provides many query methods accepting IComparer<T> or IEqualityComparer<T>. For these scenarios, LINQ to XML provides 2 built-in comparers: XNodeDocumentOrderComparer, which implements IComparer<XNode>. Its Compare method simply calls XNode.CompareDocumentOrder. Its instance is provided by XNode.DocumentOrderComparer property

C# XElement Exampl

LINQ to XML provides many additional functions and queries for XML tree navigation, ordering, XPath querying, etc. The following list shows these functions and their return types: · Navigation queries. o Query direct parent element § XObject.Parent -> XElement. o Query all ancestor elements: § XNode.Ancestors -> IEnumerable<XElement> Step 3) Bind the GridTextColumn to DataContext = {Binding Staticresource=vm} Path= {whatever intellisense tells you} If format isn't correct you can write an IValueConverter. JP Cowboy Coders Unite! The return type for linq-to-xml is IEnumberable<XElement>,which means the item is an XElement. to UI (DataGrid). Data in item looks like C# XElement Example (XElement.Load, XName) Use the XElement type to load an XML file into memory. Invoke XElement.Load and Elements. XElement loads and parses XML. It allows you to eliminate the possibility of bugs and typos. Here we see an example of XElement from LINQ. We use it to load (and query) an XML document

c# - Find an XElement with a certain attribute name and

  1. Query (2286/5847) « Previous. Get the child nodes from XElement in CSharp Description. The following code shows how to get the child nodes from XElement. Example / * w w w. j a v a 2 s. c o m * / using System;.
  2. XElement: The content can be another XElement, which is added as a child node to the parent XElement. IEnumerable: This is the magic data type, since it allows collections of data, such as those produced by LINQ query operations, to be passed in as content. The elements in the collection are iterated over, and each element is treated as a.
  3. Get child elements by name directly. Imports System Imports System.Reflection Imports System.Xml Module Module1 Sub Main() Dim xml As XElement = XElement.Load(People.xml) Dim query = From p In xml.Elements(person) _ Where p.Element(id).value = 1 _ Select p For Each record In query Console.WriteLine(Person: {0} {1}, _ record.Element(firstname), _ record.Element(lastname)) Next End.
  4. XmlElement and XElement. Since the first version of the .NET framework an XML DOM has been available for manipulating and searching XML documents. This has been in the System.Xml namespace and used classes like XmlDocument and XmlElement. These xml classes support XPath queries. XPath allows any xml node or list of nodes to be queried using an.
  5. of XElement. Also, when querying using the Elements() I needed to make sure I added the XNamespace. Thanks to everyone for their input... I knew it would be something simple I was missing.-mdb. Jul 10 '08 #10. Michael Bray. Martin Honnen <ma*****@yahoo.dewrote in news:#3LFOoq4IHA.4340.
  6. g interface, etc. Integrated in the .NET framework, LINQ to XML also makes the best use of .NET framework functionalities like debugging, compile-time checking, strong typing and many more to say

Query (2275/5847) « Previous. Get Descendants Elements with where clause in CSharp Description. The following code shows how to get Descendants Elements with where clause. { XDocument xDocument = new XDocument( new XElement(Books, new XElement (Book,. Hi! I have a problem. I´m searching a xml-document for a specific attribute value. This is my code: Copy Code. XElement root = XElement.Load (System.Environment.CurrentDirectory + \\Documents\\Codec\\super.xml ); //Search the Name of the Signal in the VAR-Region of the super.xml file. Show all ancestor elements of type PACKET and of this the.

This method is defined on IEnumerable<XElement>, and is the result of invoking the Elements method on each of the XElements within the collection returned by the preceding Descendant query. LINQ to XML defines a corresponding 'IEnumerable' extension method for each of the regular query methods on a single XElement (or XDocument ) 1. Read and query Read via XDocument. In case of XDocument you load all the nodes of XML-file. To get the top-level node you should use Root. You can add where clause according to values of neighborhood elements. Read XML via XDocument. C#. var xml = XDocument.Load (filepath, LoadOptions.None); Console.WriteLine (DateTime LINQ/XML Query Expressions Examples. The following relates to the previous two blogs. You can get the surrounding code in that C# LINQ/XML example blog. LINQ can run against different data sources, including XML an SQL. So once you learn how to write the query expressions as shown below, you can switch back and forth between them with ease users = query.ToList (); } Fabrice. PS: We have several similar LINQ to XML examples in chapter 11 of our book ;-) Tip: you can initialize your collection using the following syntax: Code Snippet. List users = new List {

Querying an XML document that uses namespaces requires that the namespaces be included in the querying syntax. This is accomplished by creating an XNamespace object that specifies the namespace name and then including it as part of the name in the XElement 's methods In this example I was trying to query a list for all list items that did not have a Status of Completed. Here is the code that finally worked. [code language=csharp] var spquery = new System.Xml.Linq.XElement(Query, new XElement(Where, new XElement(Neq, new XElement(FieldRef

How to retrieve the shallow value of an element - LINQ to

Using Ling query to create Xml output: 23. The Root property returns the top-level XElement: 24. Set new value to Xml document: 25. Selects an XElement using a XPath expression. 26. XElement Represents an XML element. 27. Selects an XElement using a XPath expression. 28. XElement Class represents an XML element. 29. Create XElement class. 30 Hi guys im currently having a problem trying to query a very complex xml file. here is how im doing it, Im getting results enumeration yielded no results here is my xml <?xml version=1.0&q.. C# (CSharp) System.Xml.Linq XDocument.Elements - 30 examples found. These are the top rated real world C# (CSharp) examples of System.Xml.Linq.XDocument.Elements extracted from open source projects. You can rate examples to help us improve the quality of examples XElement element = new XElement(Strings, (myString != null) ? (from string s in myString where s.StartsWith(S) select s) : null); This XElement yields the following result: <Strings/and empty Element. I like that I can write linq to xml in nested declarations like this. What I don't like now...is doing the nul The primary classes you will use to build a new XML document will be the XDocument, XElement and XAttribute classes. Creating a new XML document can easily be done with LINQ to XML as following: As usual, when creating XML we start by creating the document which has 1 root node, which in our case is the XElement with name Customers

Here I will show you how can you get max value from xml file. In this post we built a very simple XML document using LINQ to XML. We saw the 3 most frequently used objects in the System.Xml.Linq namespace: XDocument, XElement and XAttribute. These objects and their constructors allow the creation of XML documents in a more fluent fashion than it was possible with the original XML related objects in the System.Xml namespace LINQ, or Language-Integrated Query, is an extension to the Visual Basic and C# programming languages used to query and update data of any kind. This data can be from a database, an in-memory collection such as an array or a collection of objects, or an XML file. LINQ is a language that looks similar to Structured Query Language (SQL) In Query property of SPQuery object, we have to set the condition of FSObjType is equal to 0, this is the Item Type value for the folder, the list items or documents contain the Item Type value as 1.. And then Scope='RecursiveAll' is nothing but to retrieve all the items and folders from the list or library.. I'll hope this post help you all about retrieving all the folders. XElement xElement = XElement.Load(fileName); var query = from c in xElement.Descendants(Item) select c; foreach (var q in query) {Console.WriteLine(q);} If I remove the xmlns tag, the query works, but if I leave it there it does not (that is, I get no results). I'm not an xml wizard and am wondering if I am going about this in the wrong way.

Problem Given an XElement, what is its XPath? Preface Many XPaths can be used that will select an XML element. To select one and only one element, indexes need to be used. For example, given the following XML data: The XPath /people/person will select all the person elements that are children to people. To refe An XElement/XDocument is not strongly typed, it is a representation of a Xml document One must write code to pull information from the XElement/XDocument. This is straight forward with Linq to Xml, but complexities can arise

PPT - Platformy technologiczne linq PowerPoint

You can do this by making your subqueries having distinct values according to the join condition, or the result can be made distinct according to a field what you want. I would prefer the first way. C#. Copy Code. var q1 = ( from bl in XElement.Load ( @doc1.xml ).Elements ( line_item_data ).GroupBy (i1 = > i1.Element ( line_item ).Value. List all Url's in the SiteMap using LINQ. If you want to list down all the Url's in the SiteMap, then here's how to do so. We first retrieve a collection of attributes for the descendant elements and then retrieve the value of the 'url' attribute. The results are then bound to a Bulleted List. Dim urlList = xelement.Descendants.

Introduction . XLINQ is a redesigned Document Object Model (DOM) XML Programming API. XLinq uses the latest .NET Framework-based language. From an XML perspective XLinq provides the query and transformation power of XQuery and XPath integrated into .NET Framework languages that implement the LINQ pattern (e.g., C#, VB, etc.) LINQ Query Syntax: from <range variable> in <IEnumerable<T> or IQueryable<T> Collection> <Standard Query Operators> <lambda expression> <select or groupBy operator> <result formation>. The LINQ query syntax starts with from keyword and ends with select keyword. The following is a sample LINQ query that returns a collection of strings which. VB.NET LINQ Examples Use LINQ, a set of extensions to the language that enables query expressions. dot net perls. LINQ. This stands for Language Integrated Query. In VB.NET we import the System.Linq namespace—this provides many extension methods, ones that act on collections. LINQ allows queries In third snippet, a LINQ query is used to retrieve the book elements thatare published in year '2014'. At the start of a code snippet '3', an XML document is loaded with 'XElement' object then in the LINQ query an extension method 'Elements' returns all the elements having names, 'Book'

Learning LINQ Made Easy (LINQ to XML): Tutorial 3. This article is the next article in LINQ learning tutorials which will cover LINQ to XML basics. This article is the next in the LINQ series to make the learning easy for beginners to get a clear understanding of the concepts. I have seen young developers and students that are very confused. XDocument queryMessageDocument = XDocument.Parse(query); XElement queryMessage = queryMessageDocument.Root; ASMXSDMXServiceSoapClient sdmxServiceClient = new ASMXSDMXServiceSoapClient(); XElement compactDataMessage = sdmxServiceClient.GetCodeList(queryMessage); WCF Service example If you observe above example we added namespaces like System.Xml.Linq it will allow us to read xml document data and we written condition on XML data to get records where Salary greater than equal to 20000.Now we will run and see the result of application. Output of LINQ to XML Example. Following is the result of LINQ to XML example Customing Dump Output. You can customize how objects are dumped by writing a single method called ToDump.You can write this method either on the type itself or in LINQPad's My Extensions query (so you don't need to make any changes to the type whose output you wish to customize). ToDump also simple to write: it's just two lines of code to make all boolean values display in a different color. Another advantage of LINQ to XML is the ability to use query results as parameters to xref:System.Xml.Linq.XElement and xref:System.Xml.Linq.XAttribute object constructors enables a powerful approach to creating XML trees. This approach, called functional construction, enables developers to easily transform XML trees from one shape to another

c# sample code that uses TransactionQuery to display transaction information - ElementPS/TransactionQuery.CShar Using Namespaces with LINQ XPathSelectElement. Posted by Danny Thorpe at 1:48 pm Programming. Nov 122010. If you do a web search for how to use the LINQ XPathSelectElement function, the example code you will find falls into two categories: Those that don't use namespaces at all, and those that use the same namespace prefix in the query as in. Before LINQ to XML we were used XMLDocument for manipulations in XML like adding attributes, elements and so on. Now LINQ to XML uses XDocument for the same kind of thing. Syntaxes are much easier than XMLDocument and it requires a minimal amount of code. Also XDocument is mutch faster as XmlDocument. XmlDoucument is an old and dirty solution. In this article i will show you how to insert,update and delete data in xml by using LINQ to XML. Step 1. Create a Console application and give the solution name as LinqToXML_IUD. Step 2. In console application base directory (debug folder) insert XML file and give the file name as Customers.xml. Step 3 the query will be executed locally from that point on. You can force the second scenario by calling AsEnumerable on the query. For instance, the following uses a LINQ to SQL query to retrieve all articles on influenza, and then uses a local query to narrow the results down to only those articles whose abstract is less than 100 words

Tutorial C# - Linq to XML - Pplware

xml - c# LINQ get Attribute value from XElement - Stack

The Root property will contain an instance of XElement, corresponding to the root element of the XML document. This class provides many methods for accessing the other elements and attributes in the document. The most commonly used among them are probably: Elements, returning the direct child elements as an instance of IEnumerable<XElement> XElement - The LINQ to XML Workhorse The most frequently used class in the LINQ to XML API is the XElement class, which represents an XML element.This class is used when programmatically constructing an XML document, when loading an XML document, and when searching, filtering, or otherwise enumerating the elements within an XML document XElement.Load method will load the whole XML file in memory and if this file is quite big, not only the query might take long time to execute but it might fail running out of memory. If we had some really large XML files we need to buffer through it instead of reading the whole contents into memory LINQ to XML allows querying XML data. A new namespace in .NET 3.5, System.Xml.Linq, contains classes for creating and querying XML trees, in the XPath style: XName, used for namespace qualified identifies (Qname), used both as element and attribute name; XName objects are atomized, which means that if two XName objects have the same namespace. This query is similar to Sql query. Here select should be placed at the last. Where condition is used to check whether the title has the attribute value C# Basics. Descendants is used to returns the collection of descendant element for the book and title. Using the SetAttributeValue, set attribute name as pub and value as shree

C# XElement Example - Dot Net Perl

You don't always have to live with XElement/XDocument returned by the query and you can build custom object on fly using anonymous types as shown in SAMPLE QUERY 3 // SAMPLE QUERY 3: // Complex queries with custom functions to evaluate // conditions or select attribute values var result3 = from emp in aDoc.Descendants(Employee new XElement(VALUE, new XAttribute(TYPE, Text)))) .ToString(); That's indeed safe and compact, but it's still a manually built query. To overcome the manual construction of CAML queries, there are some useful implementations of CAML query builders that support creating a CAML query in a safe manner

XElement, System.Xml.Linq C# (CSharp) Code Examples ..

The root node in our XML, without a doubt, can be <Employees>. Now if you observe, the Employee ID property uniquely identifies each Employee. We can create Parent Nodes with the attribute ID and all the other properties like Fname, Lname, Dob and Age will be the Child Nodes. Here's the LINQ query to do so 3. Using XML serialization is certainly a valid approach. But if you wanted to keep using LINQ to XML, I would change the code to be more declarative. This way, the structure of the code would closely resemble the structure of the XML, so it would be clearer to see what's going on: XDocument doc = new XDocument ( new XElement ( SFDocument. public override void LoadFromXml( XElement element ) Public Overrides Sub LoadFromXml( element As XElement ) Parameters. Name Type Description; element: XElement: A XElement value containing an XML definition of the data source schema. See Also. SqlDataSource Class. SqlDataSource Members. DevExpress.DataAccess.Sql Namespace The following relates to this XML from yesterday's blog. You can get the surrounding code in that blog. It's advisable to use the LINQ style of query when possible, but there might be that day where you have a long complicated XPath, and you just want to use with an XElement that you loaded from LINQ. This is how to do that, with several examples

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LINQ To XML Tutorials with Examples DotNetCurr

and the change from the former code is to switch XElement to XStreamingElement and that second class doesn't build a tree in memory here - it runs the query at the point where we hit Save and so it both streams data in and out. Running this code gives me; After Creating new XML tree Elapsed time 15ms Additional memory used 428K The code first finds the set of region elements. The C# code uses the XElement methods and the VB code uses XML literals. Only the name of the regions are needed, so the next statement selects the name attribute. Again, the C# code uses the XElement methods and the VB code uses XML literals. NOTE: You can also use the XElement methods in VB as. 'LINQ' (Language Integrated Query) is a set of features to extend a query capability of the C# language by providing an IntelliSence and syntax highlighting features. As 'LINQ' is integrated in a C# language therefore, debugging of the 'LINQ' queries are possible using the integrated debugger. 'XElement' (root node. dot net perls. XElement. Parsing XML files is complicated. With the XElement type in newer versions of VB.NET, we can load XML and loop over its elements quickly. Nested elements are supported. To get nested elements, we call the Elements () Function on an XName or XElement instance. This is slower than custom parsers, but reliable SharePoint utility function which caches CAML query results. With tight deadlines, restricted budgets and pressure to deliver working functionality with no gold-plating, performance and optimisation often take a back seat. Caching is an easy technique to optimise performance which can be implemented with minimal extra effort

c# - Get a XElement at a given path - Code Review Stack

XDocument represents the XML document.. XComment represents a comment in the XML document.. XElement represents an XML element.. XAttribute represents an attribute in an XML element.. These objects can be used to access the document but also to create it. Instead of creating an XML document directly in your code, you can use the XML helper objects and a structural approach to create the same. The result of the query is an enumeration of XElement items that have been extracted from the document. The XElement class is a development of the XMLElement class that includes XML behaviors. The program uses a foreach construction to work through the collection of XElement results, extracting the required text values C# (CSharp) NameCheap Query - 14 examples found. These are the top rated real world C# (CSharp) examples of NameCheap.Query extracted from open source projects. You can rate examples to help us improve the quality of examples Traverse forward through an XML document using the property NextNode. This property will extract and return next node's values for the selected node. However, if there is no next node, it will return null. For example, if the select node has this value, <BookName>Asp.Net 4 Blue Book</BookName>, then it will NextNode property will return the. IEnumerable<XElement> q = from ele in ex.Elements(DataElement) Select ele; Seconde iterate the elements founded above,and find if its chid element has a element named QuestionName, if it has,get the value,if not have ,just skip the loop,just like code below

How to write a query that finds elements based on context

One overload of XDocument.Load receives a URI (file path). Since the xml file uses a namespace, we must query with the namespace AND element name. A Linq query utilizing C# 6 syntax to accommodate for the possibility of null values. Every . used in this query has the potential to return a null set if the condition finds no elements Dim Cart_Query As System.Collections.IEnumerable = From query In XML_File.Descendants(Carts) Order By _ CStr(query.Element(CART_NAME)) Descending, CStr(query.Element(CART_NAME)) XML_XElement.Remove then the following exception is raised whenever I try to refresh the bounded ListBox System.Xml.XmlException was unhandled LineNumber=3

Get XML Document Nodes Recursively with C#Issues in debugging custom workflow assemblies | Dreaming

So when a Query is passed, the necessary condition for paging is generated and applied before the where condition of the original query. As a speedup, it allows to execute the query with LINQ.Parallel. At least in my case the query was running faster when executed with many threads. @chiarapolyamour on I The from clause in the query specifies the data source. In this case we use only a single source of data (an array of all running processes), but a query can use multiple data sources. The where clause applies a filter, while orderby will sort the sequence of processes. Finally, the select clause is always found at the bottom of a LINQ query expression and determines what the query will return. The major advantage of Microsoft's LINQ Project is the general approach they have taken because they have integrated a query language irrespective of any specific part.Language Integrated Query can be used with XML,Database or anything which is capable of ,new XElement(phone, 425-555-0145,new XAttribute(type, wor pdub87. Thanks for the reply. EDIT: Unfortunately, I don't think I can do something like this. I need to read the categories in document order because that's how the categories are index'd IEnumerable < XElement > query = doc. Descendants (book); foreach (XElement book in query) {Console. WriteLine (book);} I'm sure that you will agree with me that it is dead easy to query XML using LINQ - let's now take the opportunity to look at a query that selects only the books of a certain publisher. Before we actually look at some. Join Walt Ritscher for an in-depth discussion in this video, XDocument compared to XElement, part of .NET Essentials: LINQ for XML