Download ADO.NET Data Services] : Working with RESTful Data by John Shaw, Gary Evans PDF

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By John Shaw, Gary Evans

Pro ADO.NET facts companies: operating with RESTful Data is geared toward builders attracted to benefiting from the REST–style info companies that ADO.NET information prone (formerly code–named Astoria) presents. The ebook exhibits find out how to include ADO.NET information prone right into a wide variety of universal environments, together with BizTalk, Ajax and Silverlight purchaser purposes. the cloth is meant for pro builders who're happy with the .NET 3.5 Framework yet are coming to ADO.NET information providers for the 1st time and need to appreciate easy methods to combine it into their very own functions and company ideas. The ebook is packed complete with large real–world strategies and routines, making sure you stroll away with a deep figuring out of the way to take advantage of ADO.NET information companies on your most sensible virtue.

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Extra info for ADO.NET Data Services] : Working with RESTful Data

Example text

Qopkiano£ Iqhpelhe_epu9,**-+: 8Aj`Nkha9Kn`anoPula9Jknpdsej`Ik`ah*Kn`ano£ Iqhpelhe_epu9&+: 8+=ook_e]pekj: The multiplicity attribute is an important part of the relationship as it defines the cardinality. qopkiano multiplicity is ,**-, which means zero or one, and Kn`ano is &, which means many. As outlined previously, a relationship can be navigated from either end, which means this could be many-to-one or one-to-many.

When creating the service, you need to surface an underlying data source that the service operates on. To keep this exercise simple, you will use the Northwind database, which is included in most Microsoft examples. qopkiano, Kn`ano, Kn`an@ap]eho, and Oqllheano as shown in Figure 2-4. Please refer to this model to understand the shape of the responses from the service. You will use the Entity Framework, which will provide an autogenerated LINQ to Entities layer. The completed Northwind data service can be downloaded from the Apress web site (dppl6++sss* ]lnaoo*_ki+^kkg+okqn_a_k`a); you’ll find it in the Jknpdsej`Oanre_a folder.

This means that it is strongly typed, taking the return type of the Sdana$% method, which is the output collection of type EAjqian]^ha8opnejc:. Finally, the query operator Pk=nn]u$% is called to cast the output sequence to the type opnejcWY. This is an important step in the preceding code, because it is only here that the query is actually executed; this process is known as deferred execution, which can mislead developers who think that the result of the query is set on the line of code that returns the original output sequence.

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