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<asp:ObjectDataSource ID="odsBookDetail" runat="server" DataObjectTypeName="BookDetails" SelectMethod="GetBook" UpdateMethod="UpdateBook" TypeName="BookBinding"> <SelectParameters> <asp:ControlParameter ControlID="lbBookList" Name="BookId" PropertyName="SelectedValue" Type="Int32" /> </SelectParameters> </asp:ObjectDataSource> Here you ve added the DataObjectTypeName attribute. This enables you to use a business object and a collection of those objects, instead of using a DataReader or DataTable. Again, using Reflection, the ObjectDataSource is able to treat public fields and properties of the type named by DataObjectTypeName as bindable members instead of relying on columns from a result set. The BookDetails type is defined in BookDetails.cs of the app_code directory. It s a standard business object with public properties, private fields, and a Save method to commit changes to an underlying data store. You ve also added a SelectParameter to the declaration of this data source. All of the parameter types listed in Table 11-3 are also available on the ObjectDataSource. Instead of acting as parameters in a SQL statement or stored procedure, they re passed here as arguments to the corresponding methods they re declared for. For example, in this case because you declared a SelectParameter, the ObjectDataSource will automatically pass an Int32 to the SelectMethod, which in this case is GetBook. Let s take a look at the code for GetBook, which is a method of BookBinding, the type named by the TypeName property. This is different than BookDetails, the type named by the DataObjectTypeName property. BookDetails is the type that BookBinding will create collections of and use for data updates. public List<BookDetails> GetBook(int BookId) { List<BookDetails> bookList = new List<BookDetails>(); bookList.Add(new BookDetails(BookId)); return bookList; } So GetBook returns a generic List of BookDetails objects. Because it accepts a BookId as an argument, there will only ever be one book in the list. This is by design. The ObjectDataSource associated with this method will bind to a DetailsView control, which only displays a single row at a time.
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Note This method uses a new feature of the .NET Framework called generics, which enable you to create and use types that have some dynamic type information built into the definition. In this case, you re creating a collection of objects, but the type in the collection is declared at the same time you declare the list using the <TypeName> syntax. For a detailed discussion of generics, see Pro C# and the .NET 2.0 Platform by Andrew Troelsen (Apress, 2005).
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Notice that for this method, there is a single argument that accepts an Int32. You declared the ObjectDataSource with an Int32 control parameter on the select statement. The control parameter points to the SelectedIndex property of the ListBox. This has the effect of passing the selected value of the ListBox into the GetBook method of the second ObjectDataSource, which you ll use to bind a DetailsView control to display the book. You can see the entire coil laid out in Figure 11-3. Keep in mind that at this point, there s not a single line of code in the code-behind the EditBook Web Form.
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Figure 11-3. Interdependent Object Data Sources used to feed values from a ListBox control to a DetailsView control Let s take a look at the declaration for the DetailsView control that displays the details of the selected book. All of the data and binding behavior for this control is already provided by the ObjectDataSource named odsBookDetail, which is, in turn, being fed a BookID value from the ListBox. This means the only thing left to specify with the declaration of the DetailsView is the look and feel you want to use to display the book data. <asp:DetailsView ID="dvEditBook" runat="server" DataKeyNames='BookID' AutoGenerateRows="False" DataSourceID="odsBookDetail" Width=600px Height="50px" CellPadding="4" ForeColor="#333333" GridLines="None" OnItemUpdated="dvEditBook_ItemUpdated" > <Fields> <asp:BoundField DataField=BookID Visible=false /> <asp:BoundField DataField="Title" HeaderText="Title" ControlStyle-Width=420px /> <asp:BoundField DataField="Publisher" HeaderText="Publisher" ControlStyle-Width=420px /> <asp:BoundField DataField="ListPrice" HeaderText="Price"
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