By Jay Hilyard, Stephen Teilhet
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Additional info for C# 3.0 cookbook with Examples
Xml"); Northwind is a DataContext class. NET Connection and Command object rolled into one. You use it to establish your connection, execute queries, or access tables directly via Entity Classes. exe. This provides access to the local Northwind database for the query. A Products DataSet is loaded from the Products table in the Northwind database for use in the query. 6. exe using the following command line syntax: SqlMetal /server:. cs XElement is one of the main classes in LINQ to XML. It enables the loading of existing XML, creation of new XML, or retrieving of the XML text for the element via ToString.
Count > 0 Creating XML Straight from a Database | 27 The middle of the query deals with joining the order and order detail information with the customer information to get the NetOrderTotal for the order. It also creates order data containing that value and the customer and order ids and the customer name. We need the NetOrderTotal in the last part of the query, so stay tuned! CustomerID into customerOrders The last part of the query determines the TotalSpend for that customer across all orders using the Sum function on NetOrderTotal for the generated customerOrders collection.
Average( )); See Also The “Extension methods” topic in the MSDN documentation. 6 Query and Join Across Data Repositories Problem You have two sets of data from different data domains, and you want to be able to combine the data and work with it. Solution Use LINQ to bridge across the disparate data domains. LINQ is intended to be used in the same manner across different data domains and supports combining those sets of data with join syntax. CategoryDescription); } The new set of data is printed to the console, but this could easily have been rerouted to another method, transformed in another query, or written out to a third data format: ProductName: Grandma's Boysenberry Spread Category: Condiments Category Description: Sweet and savory sauces, relishes, spreads, and seasonings ProductName: Gustaf's Knäckebröd Category: Grains/Cereals Category Description: Breads, crackers, pasta, and cereal ProductName: Geitost Category: Dairy Products Category Description: Cheeses ProductName: Sasquatch Ale Category: Beverages Category Description: Soft drinks, coffees, teas, beer, and ale ProductName: Inlagd Sill Category: Seafood Category Description: Seaweed and fish ProductName: Boston Crab Meat Category: Seafood Category Description: Seaweed and fish ProductName: Pâté chinois Category: Meat/Poultry Category Description: Prepared meats ProductName: Sirop d'érable Category: Condiments Category Description: Sweet and savory sauces, relishes, spreads, and seasonings ProductName: Röd Kaviar Category: Seafood Category Description: Seaweed and fish ProductName: Rhönbräu Klosterbier Category: Beverages Category Description: Soft drinks, coffees, teas, beer, and ale Discussion The solution combines data from two different data domains: XML and a SQL Database.