Apress pro LINQ Language Integrated Query in C# 2008 phần 8 pps

... 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 ... method. db.SubmitChanges(); Rattz_ 789 -3C14.fm Page 416 Tuesday, October 16, 2007 1:27 PM 388 CHAPTER 12 ■ LINQ TO SQL INTRODUCTION Using the LINQ to SQL API In order to u...

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

... 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 ... Source=.\SQLEXPRESS;Initial Catalog=Northwind ;Integrated Security=SSPI;", nwindMap); IQueryable<Linqdev.Customer> query = from cust in db.GetTable<Linqdev.Customer>() wh...

Ngày tải lên: 06/08/2014, 08:22

... Service-Oriented Architecture, 3e Beginning ASP.NET 3.5 Data Access, 2e Beginning C# 20 08 Databases Beginning C# 20 08 Pro LINQ: Language Integrated Query in C# 20 08 www .apress. com SOURCE CODE ONLINE Companion eBook ... ROADMAP Silverlight and .NET 3.5 Recipes in C# 20 08 Pro C# 20 08 and the .NET 3.5 Platform Pro WPF in C# 20 08, 2e Illust...

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... 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 ... number 2. Listing 4- 48. Returning a Sequence of Ten Integers All With the Value Two IEnumerable<int> ints = Enumerable.Repeat(2, 10); foreach(int i in int...

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... 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, ... the same prototype but, this time, with elements in the input sequence, as shown in Listing 5- 38. Listing 5- 38. First Any Prototype Where Elements Are in the Source Input...

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... 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...

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... XElement("Book", " ;Pro LINQ: Language Integrated Query in C# 20 08& quot;)), new XElement("BookParticipant", new XElement("Name", "John Q. Public"))}; Rattz_ 789 -3.book Page ... 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...

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... 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...

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... 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 Inher...

Ngày tải lên: 06/08/2014, 08:22