Apress pro LINQ Language Integrated Query in C# 2008 phần 6 ppt

... don’t you think? I just joined three XML documents in a single query. Surely you now see the power of LINQ to XML. Are you starting to see why LINQ to XML is my favorite part of LINQ? Now how ... make it interesting, I will query on the type attribute, and I will try this one in query expression syntax, as shown in Listing 9-3. Listing 9-3. Obtaining Restricted Elements Wi...

Ngày tải lên: 06/08/2014, 08:22

... options is: 5722 .66 666 666 667 Rattz_789-3.book Page 180 Tuesday, October 16, 2007 2:21 PM 168 CHAPTER 5 ■ NONDEFERRED OPERATORS The specified value is compared to each element using the EqualityComparer<K>.Default ... understanding of LINQ to Objects and just what LINQ can do for you, it’s time to learn about using LINQ to query and generate XML. This functionality is ca...

Ngày tải lên: 06/08/2014, 08:22

... THE LINQ TO XML API XProcessingInstruction.Target on XProcessingInstruction Objects and XProcessingInstruction.Data on XProcessingInstruction Objects To update the value of a processing instruction, ... PM CHAPTER 7 ■ THE LINQ TO XML API 251 <BookParticipants> <BookParticipant type="Author"> <! Author of Pro LINQ: Language Integrated Query in C# 2...

Ngày tải lên: 06/08/2014, 08:22

... do? The LINQ to DataSet operators allow a developer to perform LINQ queries on a DataSet, and since a DataSet can be obtained using normal ADO.NET SQL queries, LINQ to DataSet allows LINQ queries ... query on data in a database using ADO.NET to obtain a DataSet, then turn right around and query that data again using LINQ to DataSet, all within several lines of code. In re...

Ngày tải lên: 06/08/2014, 08:22

... to the query for the respective column. Listing 14- 16 contains an example programmati- cally building a query for such an interface. Listing 14- 16. Programmatically Building a Query Northwind db ... discriminator, which is defined as the entity class property whose IsDiscriminator attribute property is set to true. For an example, let’s examine an InheritanceMapping attribute: An In...

Ngày tải lên: 06/08/2014, 08:22

... Service-Oriented Architecture, 3e Beginning ASP.NET 3.5 Data Access, 2e Beginning C# 2008 Databases Beginning C# 2008 Pro LINQ: Language Integrated Query in C# 2008 www .apress. com SOURCE CODE ONLINE Companion eBook ... print for content only—size & color not accurate spine = 1.1 76& quot; 62 4 page count Books for professionals By professionals ® Pro LINQ: L...

Ngày tải lên: 06/08/2014, 08:22

... into the entity classes at key points in time. Finally, query expressions provide that warm fuzzy feeling when first seeing a LINQ query that makes you want to get on board with LINQ. Nothing ... my output types are integers. This code will produce the following results when you press Ctrl+F5: 5 6 8 4 6 9 7 8 10 8 4 8 5 7 8 5 6 7 9 7 7 7 7 8 6 5 6 4 6 9 4 6 6 5 9 10...

Ngày tải lên: 06/08/2014, 08:22

... example. Reprinted Here for Convenience Is Listing 1-3 using System; using System .Linq; using System.Data .Linq; using nwind; Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); var ... zero since the sequence is empty. Listing 4-49. An Example to Return an Empty Sequence of Strings IEnumerable<string> strings = Enumerable.Empty<string>...

Ngày tải lên: 06/08/2014, 08:22

... Page 4 16 Tuesday, October 16, 2007 1:27 PM 388 CHAPTER 12 ■ LINQ TO SQL INTRODUCTION Using the LINQ to SQL API In order to use the LINQ to SQL API, you will need to add the System.Data .Linq. dll ... DataContext. Listing 14-1 contains an example of inserting a record into the database. Listing 14-1. Inserting a Record by Inserting an Entity Object into Table<T> // 1. Create t...

Ngày tải lên: 06/08/2014, 08:22

... mapping file to perform a LINQ to SQL query without using any attributes. Listing 16- 9. The Third DataContext Constructor Prototype Connecting to a Database and Using a Mapping File string ... this mapping applies to is in the Linqdev namespace. I have placed this XML in a file named abbreviatednorthwindmap.xml and placed that file in my bin\Debug directory. In Listing 16- 9...

Ngày tải lên: 06/08/2014, 08:22