Apress pro LINQ Language Integrated Query in C# 2008 phần 9 ppt

... 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 ... let’s examine an InheritanceMapping attribute: An InheritanceMapping Attribute [InheritanceMapping(Code = "G", Type = typeof(Shape), IsDefault = true)] The preceding InheritanceMap...

Ngày tải lên: 06/08/2014, 08:22

... 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 called LINQ to XML and, not so coincidentally, ... Sum Prototype IEnumerable<int> ints = Enumerable.Range(1, 10); foreach (int i in ints) Console.WriteLine(i); Console.WriteLine(" "); int sum = ints.Sum(); Consol...

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

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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

... 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 ... version ISBN-13: 97 8-1- 590 59- 7 89- 7 ISBN-10: 1- 590 59- 7 89- 3 9 781 590 597 897 5 4 4 9 9 Learn to use the power of Microsoft’s ground-b...

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 ... next. Listing 3-4. An Example Demonstrating the Query Results Changing Between Enumerations // Create an array of ints. int[] intArray = new int[] { 1,2,3 }; IEnumerable<int> ints...

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 ... employee: Option records for employee: 1 12/31/ 199 9 Option records for employee: 2 6/30/ 199 2 1/1/ 199 4 4/1/2003 Option records for employee: 3 9/ 30/ 199 7 R...

Ngày tải lên: 06/08/2014, 08:22

... 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 the DataContext. Northwind ... SQL, thrown in to boot. ■Tip LINQ to SQL is an entry-level ORM tool that permits powerful SQL queries. In addition to providing LINQ query capabilities, as long as your q...

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