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Exercise caution before making changes; test the proposed change first.
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Displaying the title should be easy. However, rendering the background image could be troublesome if your menus use different background images. What you want is that in both Active and Ending states, the image is displayed. When in Starting mode, the new background image should be blended over the previous one. When blending a second image over a first image, you need to make sure your first image was actually drawn first! This is not easy, because it will involve changing the drawing order of the menus. An easier approach is to use the layerDepth argument (see recipe 3-3) of the SpriteBatch.Draw method. When in Active or Ending mode, the image will be drawn at distance 1, the deepest layer. In Starting mode, the image will be drawn at depth 0.5f, and all text will be drawn at distance 0. When using SpriteSortMode.BackToFront, first the Active or Ending menu at depth 1 will be drawn. Next, if applicable, the Starting menu will be drawn (blending over the image already there) and finally all text renderings. In the Draw method of your MenuWindow class, keep track of these two variables: float bgLayerDepth; Color bgColor; These will contain the layerDepth and transparency value for the background image, which are set in the switch structure: switch (windowState) { case WindowState.Starting: horPosition -= 200 * (1.0f - (float)smoothedProgress); alphaValue = smoothedProgress; bgLayerDepth = 0.5f; bgColor = new Color(new Vector4(1, 1, 1, alphaValue)); break; case WindowState.Ending: horPosition += 200 * (float)smoothedProgress; alphaValue = 1.0f - smoothedProgress; bgLayerDepth = 1; bgColor = Color.White; break; default: alphaValue = 1; bgLayerDepth = 1; bgColor = Color.White; break; } where Color.White is the same as Color(new Vector4(1, 1, 1, 1)), meaning full alpha value. If a menu is in Starting or Ending state, the alphaValue is calculated. Next, you use this transparency value to render the title and render the background image as well. Color titleColor = new Color(new Vector4(1, 1, 1, alphaValue)); spriteBatch.Draw(backgroundImage, new Vector2(), null, bgColor, 0, Vector2.Zero, 1, SpriteEffects.None, bgLayerDepth); spriteBatch.DrawString(spriteFont, menuTitle, new Vector2(horPosition, 200), titleColor,0,Vector2.Zero, 1.5f, SpriteEffects.None, 0);
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Step 2: Add a Policy Assertion As you saw earlier in Table 7-2 and Listing 7-1, WSE 2.0 provides built-in support for five standard policy assertions: Integrity, Confidentiality, SecurityToken, MessageAge, and MessagePredicate. These policy assertions are composable,
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Deferred deletion occurs when the business object is loaded into memory and the UI calls a method on the object to mark it for deletion. Then when the Save() method is called, the object is deleted rather than being inserted or updated. The sequence of events flows like this: 1. The object is loaded by the UI. 2. The UI calls a method to mark the object for deletion (that method must call MarkDeleted()).
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Figure 8-2. Potential user interface for an online bookstore Here s the XAML used for the section title (book name), page content (book description), and the navigation menu without using styles: <Grid.ColumnDefinitions> <ColumnDefinition Width="85"/> <ColumnDefinition Width="75"/> <ColumnDefinition /> </Grid.ColumnDefinitions> <StackPanel Grid.Row="1" Grid.Column="0"> <ListBox> <ListBoxItem> <Button Content="Home" Width="60" Margin="5"/> </ListBoxItem> <ListBoxItem> <Button Content="DVDs" Width="60" Margin="5"/> </ListBoxItem> <ListBoxItem> <Button Content="Music" Width="60" Margin="5"/> </ListBoxItem> <ListBoxItem> <Button Content="Help" Width="60" Margin="5"/> </ListBoxItem> <ListBoxItem> <Button Content="Sign Out" Width="60" Margin="5"/> </ListBoxItem> </ListBox> </StackPanel> <StackPanel Grid.Row="1" Grid.Column="2" VerticalAlignment="Top"> <TextBlock FontSize="20">Ulysses by James Joyce</TextBlock> <TextBlock FontSize="12" TextWrapping="Wrap">
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The metadata that describes an assembly and its modules is referred to as a manifest. The manifest carries the following information: Identity, including a simple textual name, an assembly version number, an optional culture (if the assembly contains localized managed resources), and an optional public key if the assembly is strong named. This information is defined in two metadata tables: Module and Assembly (in the prime module only). Contents, including types and managed resources exposed by this assembly for external use and the location of these types and resources. The metadata tables that contain this information are ExportedType (in the prime module only) and ManifestResource. Dependencies, including other (external) assemblies this assembly references and, in the case of a multimodule assembly, other modules of the same assembly. You can find the dependency information in these metadata tables: AssemblyRef, ModuleRef, and File. Requested permissions, specific to the assembly as a whole. More specific requested permissions might also be defined for certain types (classes) and methods. This information is defined in the DeclSecurity metadata table. ( 17 describes requested permissions and the ways to declare them.) Custom attributes, specific to the manifest components. Custom attributes provide additional information used mostly by compilers and other tools. The CLR recognizes a limited number of custom attributes. Custom attributes are defined in the CustomAttribute metadata table. (Refer to 16 for more information on this topic.)
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ASP .NET 2.0 not only supports the broad concept of membership as used previously, but it provides a complete membership service, including all the code to make it work. The membership service is most often used with the SQL membership provider that comes with ASP.NET. This provider requires that you use a predefined database schema, along with the membership objects provided by Microsoft to manage and interact with the database. By default, .NET will use a Microsoft SQL Server 2005 Express database in the virtual root s App_Data direcASP tory, but you can override that behavior to have it use another Microsoft SQL Server database if needed. The other membership provider shipped with ASP.NET is a connector to Active Directory (AD). It does the same thing, but stores the user information in AD instead of a SQL database.
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... } } To avoid possible confusion about the ownership of a custom attribute, it s better to declare an item s custom attributes as soon as the item s scope is opened, before any other items are declared within the scope. The preceding discussion covers the rules for assigning custom attributes to items that are declared explicitly. Obviously, these rules cannot be applied to metadata items, which are declared implicitly, simply by their appearance in ILAsm directives and instructions. After all, such metadata items as TypeRefs, TypeSpecs, and MemberRefs might want their fair share of custom attributes, too. To resolve this problem, ILAsm offers another (full) form of the custom attribute declaration, with the explicit specification of the custom attribute owner: .custom ( <owner_spec> ) instance void <class_ref>::.ctor(<arg_list>) [ = ( <hexbytes> ) ] where <owner_spec> ::= <class_ref> | <type_spec> | method <method_ref> | field <field_ref> For example: .custom ([mscorlib]System.String) instance void MyTypeRefAttribute::.ctor()=(01 00 00 00) .custom ([mscorlib]System.String[]) instance void MyTypeSpecAttribute::.ctor()=(01 00 0 0 00) .custom (method instance void [OtherAssem]Foo::Bar(int32,int32)) instance void MyMemberRefAttribute1::.ctor()=(01 00 00 00) .custom (field int32 [.module OtherMod]Foo::Baz) instance void MyMemberRefAttribute2::.ctor()=(01 00 00 00) Custom attribute declarations in their full form can appear anywhere within the ILAsm source code, because the owner of a custom attribute is specified explicitly and doesn t have to be inferred from the positioning of the custom attribute declaration. The IL disassembler puts the custom attribute declarations in full form at the end of the source code dump, before the data dump. Note that version 2.0 of the IL assembler also supports the verbal description of custom attribute values in the full form of custom attribute declaration. Two additional categories of metadata items can in principle own custom attributes: InterfaceImpls and StandAloneSigs. The existing releases of ILAsm offer no language means to define custom attributes belonging to these items, an omission to be corrected in future revisions of ILAsm and its compiler. Of course, so far no compiler or other tool has generated custom attributes for these items, but you never know. The tools develop quickly, and the custom attributes proliferate even more quickly, so sooner or later somebody will manage to assign a custom attribute to an interface implementation or a stand-alone signature.
Figure 3-9. A compilation error caused by an aspx file This is nice, but there are other interesting behaviors you get out of web applications because you don t need to compile. For example, consider an application with two pages, one that works great (Default.aspx) and one that won t compile (Default3.aspx). Before you fix Default3.aspx, you want to make a change to Default.aspx and test it. For example, you may add the following code to the page load of the Default page: protected void Page_Load(object sender, EventArgs e) { FindControl("form1").Controls.Add(new LiteralControl("Hello")); } This code works fine. When you compile, however, you still get the error previously listed (see Figure 3-9) because of the error in Default3.aspx. In VS .NET 2K3, this means the Web Project Assembly failed to get created when compiling, and the completely unrelated change you made to your code-behind in Default.aspx is not baked into a new version of the Assembly. In this environment, though, compilation is optional. The fact that the compile failed is irrelevant. You can right-click on Default.aspx in Solution Explorer and tell the IDE to display it in the browser. The IDE fires up a browser instance and, voila! the page appears just fine, as demonstrated in Figure 3-10. This demonstrates a couple of interesting things. First, when you make a change to a code-behind file, you don t have to recompile. If you just request the page anew, your change shows up. In VS .NET 2K3 this is true if you make a change to an aspx file. Without recompiling, the change shows up on the next request to the page. Now, since all compilation is put off until runtime, the same is true of code-behind changes. The other interesting thing this demonstrates is that not everything in the site has to be working in order to request pages in the site. With version 1.x of the Framework, this is not true, because if there are any problems in the code-behind you cannot successfully build the Web Project Assembly.
CHAPTER 2: Responsive Social Gaming with RESTful Web Services
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