introducing language integrated query linq

... 2007 8:59 AM Pro LINQ Language Integrated Query in C# 2008 ■■■ Joseph C Rattz, Jr Rattz_789-3FRONT.fm Page ii Thursday, October 25, 2007 8:59 AM Pro LINQ: Language Integrated Query in C# 2008 ... A Simple XML Query Using LINQ to XML using System; using System .Linq; using System.Xml .Linq; XElement books = XElement.Parse( @" Pro LINQ: Language Integrated Query in C# ... Pro LINQ: Language Integrated Query in C# 2008 Hello LINQ A Paradigm Shift Query XML Query...

Ngày tải lên: 18/01/2014, 03:20

... tốt  LINQ2 Objects1: Lamba Expression, Extension Method, var…  LINQ2 Objects2: ví dụ LINQ to Objects  XLINQ: ví dụ LINQ to XML Cần copy file cd_catalog.xml contacts.xml thư mục C:\\  DLINQ: ... This facility is called NET Language- Integrated Query (LINQ) Kiến trúc thành phần LINQ Objects XML Relational Tại dùng LINQ ADO.net, Xpath, XSLT ... contacts.xml thư mục C:\\  DLINQ: ví dụ LINQ to SQL Cần cài MS-SQL 2005 với database AdventureWorks Northwind MbUnit: xem project TestXLINQ solution XLINQ    Download cài đặt MbUnit đây: http://mb-unit.googlecode.com/files/MbUnit-2.4.2.130-Setup.exe...

Ngày tải lên: 24/01/2014, 01:20

... 2007 8:59 AM Pro LINQ Language Integrated Query in C# 2008 ■■■ Joseph C Rattz, Jr Rattz_789-3FRONT.fm Page ii Thursday, October 25, 2007 8:59 AM Pro LINQ: Language Integrated Query in C# 2008 ... A Simple XML Query Using LINQ to XML using System; using System .Linq; using System.Xml .Linq; XElement books = XElement.Parse( @" Pro LINQ: Language Integrated Query in C# ... Pro LINQ: Language Integrated Query in C# 2008 Hello LINQ A Paradigm Shift Query XML Query...

Ngày tải lên: 05/03/2014, 21:20

... 2007 8:59 AM Pro LINQ Language Integrated Query in C# 2008 ■■■ Joseph C Rattz, Jr Rattz_789-3FRONT.fm Page ii Thursday, October 25, 2007 8:59 AM Pro LINQ: Language Integrated Query in C# 2008 ... A Simple XML Query Using LINQ to XML using System; using System .Linq; using System.Xml .Linq; XElement books = XElement.Parse( @" Pro LINQ: Language Integrated Query in C# ... Pro LINQ: Language Integrated Query in C# 2008 Hello LINQ A Paradigm Shift Query XML Query...

Ngày tải lên: 06/08/2014, 08:22

... new C# 3.0 language enhancement known as query expressions Query expressions allow LINQ queries to be expressed in nearly SQL form, with just a few minor deviations To perform a LINQ query, it ... equivalent query using the query expression syntax: 37 Rattz_789-3C02.fm Page 38 Tuesday, October 16, 2007 2:19 PM 38 CHAPTER ■ C# 3.0 LA NGUA GE EN HA NCE MENTS FOR LINQ Listing 2-18 The Equivalent Query ... wordy description of the query expression syntax, use the following grammar diagram provided by Microsoft in the MSDN LINQ documentation: query- expression: from-clause query- body from-clause:...

Ngày tải lên: 06/08/2014, 08:22

... Standard Query Operator method to be called For example, when I cover LINQ to SQL in a later part of this book, you will see that LINQ to SQL actually uses its own type of sequence, IQueryable, ... DEFE RRED OPE RATORS on a sequence of type IQueryable, it is the LINQ to SQL Where method that will get called, not the LINQ to Objects Standard Query Operator Where method In fact, without ... you cannot call a Standard Query Operator on a sequence of type IQueryable If you try to call one of the Standard Query Operators, you will get an exception unless a LINQ to SQL operator exists...

Ngày tải lên: 06/08/2014, 08:22

... you is essential From my coverage of LINQ to Objects and the Standard Query Operators, hopefully you can see just how powerful and convenient LINQ is for querying data of all types of in-memory ... That alone makes LINQ to XML worth its weight in gold Of course, it wouldn’t be a part of LINQ if the new XML API didn’t support LINQ queries In that vein, several new XML-specific query operators, ... a data query More specifically than that, they seem to want to exclude data sources other than databases LINQ to XML is here to tell you that LINQ is about XML too And not just about querying...

Ngày tải lên: 06/08/2014, 08:22

... "Joey"; firstParticipant.Nodes().OfType().Single().Value = "Author of Pro LINQ: Language Integrated Query in C# 2008."; ((XElement)firstParticipant.Element("FirstName").NextNode) Nodes().OfType().Single().Value ... T O XM L AP I LINQ: Language Integrated Query in C# 2008. > Joey Rattz, Jr. ... Are you starting to see how cleverly all the new C# language features and LINQ are coming together? Isn’t it cool that we can use that Standard Query Operator to restrict the sequence of XML nodes...

Ngày tải lên: 06/08/2014, 08:22

... trees using LINQ to XML I believe that this new XML API will prove to be quite useful for querying XML data In particular, the way the Standard Query Operators can be mingled with LINQ to XML ... will hopefully make querying XML with the LINQ to XML API seem trivial, including some that use the query expression syntax for those of you who prefer it Additionally, the new LINQ to XML API just ... System .Linq and System.Xml .Linq Therefore, you will want to add using directives for these if they are not already present: using using using using using using System .Linq; System.Xml; System.Xml .Linq; ...

Ngày tải lên: 06/08/2014, 08:22

... powerfully flexible query language makes LINQ to XML my personal favorite part of LINQ If you find yourself dreading XML or intimidated to work with it, I think you will find the LINQ to XML API ... things in this example In each LINQ query where I query the DataRow on its Name field, again, I am mixing query expression syntax and standard dot notation syntax in the query Also, I am using the ... using System .Linq; Typed DataSets Typed DataSets can be queried using LINQ, just as untyped DataSets can However, typed DataSets make your LINQ query code simpler and easier to read When querying...

Ngày tải lên: 06/08/2014, 08:22

... the fact that the query is indeed integrated into the language, since after all, this is what LINQ is named for: Language Integrated Query Second, notice that I am mixing both query expression ... their own LINQ APIs I personally would like to see a LINQ to DB2 API, and I am sure many others would like to see LINQ to Oracle, LINQ to MySQL, LINQ to Sybase, and perhaps others ■Note LINQ to ... sequence of type IQueryable Listing 14-6 contains an example of a query returning a sequence of type IQueryable Listing 14-6 A Simple LINQ to SQL Query Returning an IQueryable Sequence...

Ngày tải lên: 06/08/2014, 08:22

... explanation of deferred query execution Deferred query execution refers to the fact that a LINQ query of any type—be it a LINQ to SQL query, a LINQ to XML query, or a LINQ to Objects query may not actually ... ('') enclose it One of the goals of LINQ is to allow developers to program in their native programming languages Remember, LINQ stands for Language Integrated Query However, since the database ... the query sequence being enumerated Another repercussion is that, since the SQL query is performed when the query sequence is enumerated, enumerating it multiple times results in the SQL query...

Ngày tải lên: 06/08/2014, 08:22

... System.Data.Common.DbCommand GetCommand(IQueryable query) This method is passed a LINQ to SQL query in the form of an IQueryable, and returns a System Data.Common.DbCommand for the passed LINQ query Examples In Listing ... Catalog=Northwind ;Integrated Security=SSPI;", nwindMap); IQueryable query = from cust in db.GetTable() where cust.Country == "USA" select cust; foreach (Linqdev.Customer ... defined the LINQ query once, but I caused it to be performed twice by enumerating the returned sequence twice Remember, due to deferred query execution, the definition of the LINQ query does not...

Ngày tải lên: 06/08/2014, 08:22

... concepts & Types LinQ Basic concepts  LINQ requirements  Concepts Types  LINQ to objects  LINQ to SQL  LINQ to Entity  LINQ to XML HO CHI MINH UNIVERSITY OF INDUSTRY New features in language: ... INDUSTRY What is LINQ:   Everywhere LINQ to Objects, LINQ to SQL, and LINQ to XML LINQ is an extendable technology – open-source product: LINQ Extender •  build your own LINQ extensions Other ... listNumber.SelectItemInListBox(x => x % == 0); } HO CHI MINH UNIVERSITY OF INDUSTRY LINQ Language Integrated Query LINQ does create a new way of looking at enumerations of data, and gives out-of-the-box...

Ngày tải lên: 15/03/2014, 15:20

... parse We will use this space to perform query expansion in IR, a task that aims to find additional words related to original query terms, such that an expanded query including these words better expresses ... interpolation between the query and relevance models is set at 0.7 (for WSJ9092) and 0.9 (for AP89 and AP8889) The HAL-based query expansion methods add the top 80 expansion terms to the query with interpolation ... results using original HAL, eHAL1 and eHAL-2 with a widely used unigram language model (LM) for IR and a state of the art query expansion method, namely the Relevance Model (RM) (Lavrenko and Croft,...

Ngày tải lên: 20/02/2014, 04:20

Ngày tải lên: 08/03/2014, 18:20

... Israel Language Query Operators • Language query operators are language keywords that are mapped to query operators – Not all query operators are accessible via keywords • C# integrated query ... 14-18 Baruch Hirsch St Bnei Brak 51202 Israel Syntactic Sugar • Language query operators translate directly to LINQ query operators • Query operators can be mixed: int cnt = (from i in Enumerable.Range(0, ... Baruch Hirsch St Bnei Brak 51202 Israel Chapter Summary • Why query operators? • Developing custom query operators • Language integrated query operators © Copyright SELA Software & Education Labs...

Ngày tải lên: 12/01/2013, 16:18

... Bài giảng Thiết Kế Hệ Thống Số Phần VHDL VHDL Very High speed integrated circuit Description Language I CẤU TRÚC CỦA MỘT THIẾT KẾ DÙNG NGÔN NGỮ VHDL Ghi ...

Ngày tải lên: 12/09/2013, 22:38

... 20, “Using LINQ to SQL.” ■■ LINQ to XML  LINQ lets you query XML tags and attributes as if they were typical database elements The LINQ to XML provider is not discussed in this book LINQ is extensible, ... object instance LINQ s core implementation appears in the System .Linq namespace Chapter 17  Introducing LINQ 293 Starting a Query with the From Clause The starting point for most LINQ queries is ... defined within each set Chapter 18, “Using LINQ to DataSet,” introduces this DataSet-centric form of LINQ ■■ LINQ to Entities  This provider enables LINQ queries against an Entity Data Model,...

Ngày tải lên: 03/10/2013, 00:20