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Working with Data Source Controls and Data-Bound Controls
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That is all that is required to create a basic Dynamic Data website. You can now run the site and view, edit, insert, and delete data by using the template user interface. Figure 12-24 shows an example of the Products table in a web browser. Notice the URL, Products/List.aspx. This table/action convention is defined in the routing. It simply indicates that the List.aspx template page should be called and the Product data should be displayed from the model.
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FigURE 12-24 An example LINQ to SQL DBML model.
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Notice also the default filters created for this list. The Discontinued filter is based on a Boolean field in the data. The Category filter is based on the relationship between Product and Category. In fact, relational IDs won t be displayed in the table, but related data will be. You can see that this was possible for the Category, because it exposed the CategoryName field. However, this was not possible for SupplierID because this table does not include a SupplierName field. You can also see that the form allows you to page the data; select how many rows to show in a page; edit, delete, and view the details of an item; insert a new item; and connect to data related to a particular row (View Order_Details). Figure 12-25 shows an example of inserting a product. Notice that here you again get the Category drop-down list. You can also see that default data validation is being used. The validation is based on stored data types.
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Lesson 3: Working with ASP.NET Dynamic Data
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FigURE 12-25 Automatic data validation in insert mode.
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This site behavior is the default behavior with the template scaffolding. You can see that there was no code or customization done to this site. In upcoming sections, you will see how to customize the routing, create new page and field templates, and add custom business logic to validate data.
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ASP.NET Dynamic Data relies on several classes inside the System.Web.DynamicData namespace. These classes include controls for defining custom field user controls, managing the routing, and using Dynamic Data inside a webpage. The MetaModel classes are found in the System.Data.Linq.Mapping namespace. Figure 12-26 shows some of the key classes used by Dynamic Data. Many of these classes will be discussed in upcoming sections.
762 ChAPTER 12
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FigURE 12-26 Some of the key classes related to ASP.NET Dynamic Data.
Extending and Customizing Dynamic Data
ASP.NET Dynamic Data is fully extensible. You can customize how fields are edited, how data is displayed, the look of the pages, the URL routing, data validation, and more. You can create customizations to existing templates that will be applied to all data elements. You can also create new, entity-specific templates for customizations that are specific to a particular entity. This section walks you through common customizations you might want to make when using ASP.NET Dynamic Data.
Defining Custom Routing
Dynamic Data uses the same routing features from System.Web.Routing that are used by ASP.NET model-view-controller (MVC) (see 14, Creating Websites with ASP.NET MVC 2 ). This routing engine maps intelligent Uniform Resource Identifiers (URIs) that are defined based on user actions to actual pages in your site, which makes the URIs easier to understand for users and search engines.
Lesson 3: Working with ASP.NET Dynamic Data
ChAPTER 12
For example, Dynamic Data exposes the List.aspx, Edit.aspx, Insert.aspx, and Details.aspx page templates for working with data. These pages are called by the routing engine based on the user s action: List, Edit, Details, or Insert. A DynamicDataRoute class is created and added to the RouteTable.Routes collection inside the Global.asax file. This DynamicDataRoute indicates that a URI should be mapped as table/action.aspx. The following shows the code from the Global.asax file that does this.
Sample of Visual Basic Code routes.Add(New DynamicDataRoute("{table}/{action}.aspx") With { .Constraints = New RouteValueDictionary( _ New With {.Action = "List|Details|Edit|Insert"}), .Model = DefaultModel}) Sample of C# Code routes.Add(new DynamicDataRoute("{table}/{action}.aspx") { Constraints = new RouteValueDictionary( new { action = "List|Details|Edit|Insert" }), Model = DefaultModel
This code ensures that a call to http://mysite/products/Edit.aspx ProductID=1 will be routed to the /DynamicData/PageTemplates/Edit.aspx page. When accessed, the page will know the right table to edit (Products) and right record to edit (ProductID=1).
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