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Figure 3-14. A model using Table per Hierarchy inheritance with three derived types This model uses Table per Hierarchy inheritance. The Medium entity has a discriminator property whose values determine which derived type is represented by a row from the database. This discriminator column has a value of 1 for the Article type, a value of 2 for the Video type, and a value of 3 for the Picture type. Because the property is used only to determine the derived type, it is not shown as part of the entity. You want to query the model for all media and sort the results by the derived types: Article, Video, and Picture. To do this, follow the pattern in Listing 3-16. Listing 3-16. Sorting Table per Hierarchy inheritance by type using (var context = new EFRecipesEntities()) { context.Media.AddObject(new Article { Title = "Woodworkers' Favorite Tools" }); context.Media.AddObject(new Article { Title = "Building a Cigar Chair" }); context.Media.AddObject(new Video {

You must give types careful consideration when one page does a postback to another The biggest reason for this is that the page that does the posting is exposed on the target page via the PreviousPage attribute This is an instance of a Page object, which is all well and good, but when it comes time to do something with the information on the Page that did the posting, you must make some assumptions about the that page You may even find yourself casting the PreviousPage property into the type of the posting page In doing so, you re creating a tight coupling between these pages, which may minimize reuse of the page that gets posted to, something you should be aware of during design Let s take a look at a few ways you can get to the information from the posted page.

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Problem ................................................................................................................................................ 401 Solution ................................................................................................................................................ 401 How It Works ........................................................................................................................................ 404

Make sure the test results are automatically emailed to the whole team Think of scenario tests as black box tests, because they don t know about the internals of the code under test Conversely, unit tests are almost always white box because they often need to set internal parameters in the code under test, or substitute services with mock objects Controller tests, meanwhile, are gray box tests because it s preferable for them to be white box, but occasionally they do need to delve into the code under test..

Problem ................................................................................................................................................ 404 Solution ................................................................................................................................................ 404 How It Works ........................................................................................................................................ 408

Perhaps the easiest is to use the FindControl method of the Page type Here s some code you can use from the page that gets posted to (CrossPage2aspx): string bodyColor = ((TextBox)thisPreviousPageFindControl("txtBgcolor"))Text; Here a string is declared and set equal to the Text property of a TextBox To obtain the reference to the TextBox, you pass its ID (as declared on CrossPageaspx) to the FindControl method Since FindControl returns a reference to a SystemWebUIControl object (the base class of TextBox), you must explicitly cast it to the TextBox type in order to drill into the Text property This coupling doesn t mean that only CrossPageaspx can use CrossPage2aspx The coupling it creates is this: Any page posting to CrossPage2 must contain a TextBox named txtBgcolor.

Problem ................................................................................................................................................ 408 Solution ................................................................................................................................................ 408 How It Works ........................................................................................................................................ 411

Summary

This isn t necessarily a problem, and it doesn t mean CrossPage2 cannot be reused; it s just something you need to take into account during design This method of accessing the previous page is very late bound If txtBgcolor doesn t exist, this will not show up as a problem until runtime To create a much looser coupling, you could check the return value of FindControl for nulls (the value returned when the control isn t found) and deal with this case is a separate branch of code: TextBox txt = (TextBox)thisPreviousPageFindControl("txtBgcolor"); string bodyColor; if (txt == null) bodyColor = "Lime"; else bodyColor = txtText; FindControl does a recursive descent of the page s control tree, which can be expensive if there are a lot of controls to search through and/or you re seeking references to many different controls.

Problem ................................................................................................................................................ 412 Solution ................................................................................................................................................ 412 How It Works ........................................................................................................................................ 415

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