Using LINQ to DataSet

... tables you need to query with LINQ are large and you aren’t able to first reduce the num- ber of ADO.NET-managed rows, you might wish to consider alternatives to LINQ to DataSet. LINQ to Entities, ... introduced LINQ to DataSet, an ADO.NET-focused variation of LINQ to Objects. The implementation of the LINQ to Dataset provider shares a close relationship and s...

Ngày tải lên: 03/10/2013, 00:20

... While other LINQ providers can be mixed—Chapter 18, Using LINQ to DataSet, ” combined LINQ to Objects and LINQ to DataSet content LINQ to Entities imposes restric- tions on the type of data involved ... Queries with LINQ to Entities As with all LINQ providers, the general structure of LINQ to Entities queries varies only a little from the LINQ to Objects sta...

Ngày tải lên: 03/10/2013, 00:20

... Chapter 20 Using LINQ to SQL After completing this chapter, you will be able to:  Build LINQ queries that use the LINQ to SQL provider  Understand how LINQ to SQL prepares queries ... useful tool for applications that need easy access to a specific SQL Server database. Comparing LINQ to SQL with LINQ to Entities The LINQ to SQL provider first appeared with the...

Ngày tải lên: 03/10/2013, 00:20

... of ways to achieve one -to- one joins using LINQ, which include ■ Using the join (or Join ) operator ■ Using a subquery in the select projection ■ Using the SingleOrDefault operator in the ... another, and to deeply look at how to create cus- tom operators for any specific purpose. I hope you agree after reading this book that it does offer an insight into how to use L...

Ngày tải lên: 24/12/2013, 08:16

... Namespaces, variables, and constants using System; using System.Configuration; using System.Windows.Forms; using System.Text; using System.Xml; using System.Data; using System.Data.SqlClient; ... [ Team LiB ] Recipe 8.6 Using XPath to Query Data in a DataSet Problem You need to use an XPath expression to extract certain rows from a DataSet. Solution Use S...

Ngày tải lên: 26/01/2014, 10:20

... they had been told by a doctor or other health professional that they had these conditions. To be eligible to provide answers to the questions about asthma, respondents first had to answer affirma- tively ... specified monitoring criteria to AQS annual monitoring data resulte d in the inclusion of 1125, 1111, 1074 and 1051 monitors for each year from 2002 to 2005, respectively. Fi...

Ngày tải lên: 06/03/2014, 19:20

... 2009 LINQ to SQL Tutorial From ScottGu blog Đào Hải Nam LINQ to SQL Tutorial 2 LINQ to SQL Tutorial Được dịch từ blog ScottGu - http://weblogs.asp.net/scottgu/default.aspx ... mô hình LINQ to SQL). Bằng cách dùng trình thiết kế LINQ to SQL, tôi có thể dễ dàng tạo một mô hình cho CSDL mẫu “Northwind” giống như dưới đây: LINQ to SQL Tutorial 7 Mô hình LINQ to SQL ......

Ngày tải lên: 12/01/2013, 16:18

... Brak 51202 IsraelLINQ via C# 3.0Chapter 4 – LINQ to Objects © Copyright SELA Software & Education Labs Ltd. 14-18 Baruch Hirsch St. Bnei Brak 51202 IsraelLINQ to Objects Using language integrated ... Ltd. 14-18 Baruch Hirsch St. Bnei Brak 51202 IsraelLINQ to Objects LINQ to Objects relies on the Enumerable class, which contains query operators as extension methods•Any IEnumera...

Ngày tải lên: 12/01/2013, 16:18