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USING ENTITY FRAMEWORK IN ASP.NET
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In the Application_Start() event handler in Global.asax, we mapped the route /Products/{category} to the ~/Products.aspx page. The route key, category, is bound to the actual category string in the URL. In the QueryExtender control in Products.aspx, we used the category route key in a RouteParameter to filter the result set to just those products in the given category. If you need more control over the filtering or don t want to use a QueryExtender control, you can use the OnQueryCreated attribute on the EntityDataSource control to inject your own filter on the result set. In Listings 4-16 and 4-17, we have the same GridView as in Listing 4-14, but we have replaced the QueryExtender control with our own OnQueryCreated handler. Listing 4-16. The same products page but without the QueryExtender control <body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" DataSourceID="itemSource"> <Columns> <asp:BoundField DataField="Name" HeaderText="Product" /> <asp:TemplateField HeaderText="Category"> <ItemTemplate><%# Eval("ItemCategory.Name") %></ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> <asp:EntityDataSource ID="itemSource" runat="server" EntitySetName="Items" Include="ItemCategory" ConnectionString="name=EFRecipesEntities" DefaultContainerName="EFRecipesEntities" OnQueryCreated="ProdFilter" /> </div> </form> </body> Listing 4-17. The OnQueryCreated event handler in our code behind for our alternate products page protected void ProdFilter(object sender, QueryCreatedEventArgs e) { var catvalue = (string)Page.RouteData.Values["category"]; e.Query = from p in e.Query.Cast<Item>() where p.ItemCategory.Name == catvalue select p; } The resulting pages look just like the ones in Figures 4-16 and 4-17. The only difference is that we have more control of the filtering and don t need to use a QueryExtender control.
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4-8. Building CRUD Operations with an ObjectDataSource Control
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You want to build an ASP.NET page that allows inserting, updating, deleting, and reading from your model using an ObjectDataSource control.
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Suppose you have a model like the one in Figure 4-18.
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Figure 4-18. A model for hotel reservations Our model represents hotels and their reservations. We want to use an ObjectDataSource control to perform inserts, updates, deletes, and, of course, select operations against this model. To do this, we first need to create a couple of objects that will serve as the sources of our data. We loosely follow the Repository Pattern in Listing 4-18 in building these objects. Listing 4-18. Our HotelRepository and ReservationRepository classes public class HotelRepository { private EFRecipesEntities context; public HotelRepository() { this.context = new EFRecipesEntities(); } public void Dispose() { this.context.Dispose(); }
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public List<Hotel> GetHotels() { return this.context.Hotels.OrderBy(h => h.Name).ToList(); } } public class ReservationRepository { private EFRecipesEntities context; public ReservationRepository() { this.context = new EFRecipesEntities(); } public void Dispose() { this.context.Dispose(); } public List<Reservation> GetReservations(string sort, int startRowIndex, int maximumRows) { return this.context.Reservations.Include("Hotel") .OrderBy("it." + (sort == string.Empty "Name" : sort)) .Skip(startRowIndex).Take(maximumRows).ToList(); } public int ReservationCount() { return this.context.Reservations.Count(); } public void Insert(Reservation reservation) { this.context.Reservations.AddObject(reservation); context.SaveChanges(); } public void Update(Reservation reservation) { this.context.Reservations.Attach(reservation); this.context.ObjectStateManager .ChangeObjectState(reservation, EntityState.Modified); this.context.SaveChanges(); } public void Delete(Reservation reservation) { this.context.Reservations.Attach(reservation); this.context.Reservations.DeleteObject(reservation);
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this.context.SaveChanges(); } } Once we have the object that will supply our data, we can construct the ASP.NET page that uses the ObjectDataSource control to perform the inserts, update, deletes, and selection of the data. This page is shown in Listing 4-19. The code behind for the page is shown in Listing 4-20. Listing 4-19. The ASP.NET page using the ObjectDataSource control <body> <form id="form1" runat="server"> <div> <asp:ListView ID="reservationList" runat="server" DataSourceId="reservationSource" DataKeyNames="ReservationId,TimeStamp" InsertItemPosition="LastItem"> <EditItemTemplate> <tr> <td> <asp:Button runat="server" CommandName="Update" Text="Update" /> <asp:Button runat="server" CommandName="Cancel" Text="Cancel" /> </td> <td> <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("Name") %>' /> </td> <td> <asp:DropDownList ID="hotel" runat="server" AppendDataBoundItems="true" SelectedValue = '<%# Bind("HotelId") %>' DataSourceID="HotelSource" DataTextField="Name" DataValueField="HotelId"> <asp:ListItem Text="Select" Value="" /> </asp:DropDownList> <asp:ObjectDataSource ID="hotelSource" runat="server" TypeName="Recipe8.HotelRepository" SelectMethod="GetHotels" /> </td> <td> <asp:TextBox ID="ResDateTextBox" runat="server" Text='<%# Bind("ReservationDate") %>' /> </td> <td> <asp:TextBox ID="RateTextBox" runat="server" Text='<%# Bind("Rate") %>' /> </td> </tr> </EditItemTemplate> <InsertItemTemplate> <tr> <td>
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<asp:Button runat="server" CommandName="Insert" Text="Insert" /> <asp:Button runat="server" CommandName="Cancel" Text="Cancel" /> </td> <td> <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("Name") %>' /> </td> <td> <asp:DropDownList ID="hotel" runat="server" AppendDataBoundItems="true" SelectedValue='<%# Bind("HotelId") %>' DataSourceID="hotelSource" DataTextField="Name" DataValueField="HotelId"> <asp:ListItem Text="Select" Value="" /> </asp:DropDownList> <asp:ObjectDataSource ID="hotelSource" runat="server" TypeName="Recipe8.HotelRepository" SelectMethod="GetHotels" /> </td> <td> <asp:TextBox ID="ResDateTextBox" runat="server" Text='<%# Bind("ReservationDate") %>' /> </td> <td> <asp:TextBox ID="RateTextBox" runat="server" Text='<%# Bind("Rate") %>' /> </td> </tr> </InsertItemTemplate> <ItemTemplate> <tr> <td> <asp:Button runat="server" CommandName="Delete" Text="Delete" /> <asp:Button runat="server" CommandName="Edit" Text="Edit" /> </td> <td><%# Eval("Name") %></td> <td><%# Eval("Hotel.Name") %></td> <td><%# Eval("ReservationDate") %></td> <td><%# Eval("Rate") %></td> </tr> </ItemTemplate> <LayoutTemplate> <table> <tr> <th></th> <th> <asp:LinkButton runat="server" CommandName="Sort" CommandArgument="Name" Text="Name" /> </th> <th> <asp:LinkButton runat="server" CommandName="Sort" CommandArgument="Hotel.Name" Text="Hotel" /> </th>
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