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Note This Read method doesn t yet create and return a fully working Terrain object, because there s

The conversion operations have no parameters. They take a value from the stack, convert it to the type specified by the opcode, and put the result back on the stack. The specifics of the conversion obviously depend on the type of the converted value and the target type (the type to which the value is converted). If the type of the value on the stack is the same as the target type, no conversion is necessary, and the operation itself is doing nothing more than bloating the IL code. For integer source and target types, several rules apply. If the target integer type is narrower than the source type (for example, int32 to int16, or int64 to int32), the value is truncated that is, the most significant bytes are thrown away. If the situation is the opposite if the target integer type is wider than the source the result is either sign-extended or zero-extended, depending on the type of conversion. Conversions to signed integers use signextension, and conversions to unsigned integers use zero-extension.

The differences in the timing of the execution of the queries can be summarized as follows: If a query expression returns an enumeration, the query is not executed until the enumeration is processed. If the enumeration is processed multiple times, the query is executed multiple times. If the query expression returns a scalar, the query is executed immediately, and the result is stored in the query variable. Figure 21-2 illustrates this for the enumerable query. Variable lowNums contains a reference to the enumerable that can enumerate the query results from the array.

A business object developer must specify the roles that are allowed and denied access to each property and method. The AuthorizationRules class maintains two lists of the roles. One list is shared across all instances of each business object type, and the other list is maintained for each individual object instance. The list maintained across all instances of a type is far more efficient in terms of memory and performance and should be the preferred approach. A business object developer must override the AddAuthorizationRules() method to associate shared per-type roles with properties and methods. The code in the business object looks like this:

<vsm:VisualState x:Name="Normal"/> </vsm:VisualStateGroup> </vsm:VisualStateManager.VisualStateGroups> </Grid> </ControlTemplate> <ControlTemplate x:Key="HorizontalIncrementTemplate" TargetType="RepeatButton"> </ControlTemplate> <ControlTemplate x:Key="HorizontalDecrementTemplate" TargetType="RepeatButton"> </ControlTemplate> <ControlTemplate x:Key="VerticalIncrementTemplate" TargetType="RepeatButton"> </ControlTemplate> <ControlTemplate x:Key="VerticalDecrementTemplate" TargetType="RepeatButton"> </ControlTemplate> <ControlTemplate x:Key="VerticalThumbTemplate" TargetType="Thumb"> </ControlTemplate> <ControlTemplate x:Key="HorizontalThumbTemplate" TargetType="Thumb"> </ControlTemplate> </Grid.Resources> <vsm:VisualStateManager.VisualStateGroups> <vsm:VisualStateGroup x:Name="CommonStates"> <vsm:VisualState x:Name="Normal"/> <vsm:VisualState x:Name="MouseOver"/> <vsm:VisualState x:Name="Disabled"> <Storyboard> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="Root" Storyboard.TargetProperty="(UIElement.Opacity)"> <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.5"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </vsm:VisualState> </vsm:VisualStateGroup> </vsm:VisualStateManager.VisualStateGroups> <Grid x:Name="HorizontalRoot"> <!-- Grid definition and main controls --> <RepeatButton x:Name="HorizontalSmallDecrease" ...> <RepeatButton x:Name="HorizontalLargeDecrease" ...> <Thumb MinWidth="10" x:Name="HorizontalThumb" ...> <RepeatButton x:Name="HorizontalLargeIncrease" ...> <RepeatButton x:Name="HorizontalSmallIncrease" ...> </Grid> <Grid x:Name="VerticalRoot" Visibility="Collapsed"> <!-- vertical appearance of ScrollBar --> </Grid> </Grid> </ControlTemplate>

When defining a large object, you ll mostly want to define your structure using indices, because this is the only way a vertex can be used by multiple triangles, which allows smooth lighting on your object (see recipe 6-2). Therefore, this recipe will base its calculations on two arrays containing the vertices and indices of your structure:

public string ComponentId { get; set; } public Emulator Emulator { get; } public bool InvokeRequired { get; } public IAsyncResult BeginInvoke(Delegate method); public IAsyncResult BeginInvoke(Delegate method, params object[] args); public virtual void Configure(XmlReader reader); public object EndInvoke(IAsyncResult asyncResult); public virtual void InitializeComponent(); public object Invoke(Delegate method); public object Invoke(Delegate method, params object[] args); public virtual bool IsReplaceableBy(EmulatorComponent ec); public virtual void SetupComponent(); protected void ThrowIfNotConfigurable(); protected void ThrowIfNotSetup(); public virtual void UninitializeComponent(); } } If you call the ThrowIfNotConfigurable method, an exception will be thrown if the emulator and all its components are already configured. With this method, you can ensure, in the setter method of a property, that the property value may not be further changed at runtime after the emulator was configured. The overloads of the Invoke method enable you to synchronize data access of emulator components within different threads. With emulators that have a graphical user interface (GUI), the GUI and the emulator run in two different threads. You will see concrete samples when discussing the various emulator components.