The UPDATE will cause much of the same work as the INSERT to take place. This time, the amount of undo will be larger; we have some before images to save as a result of the UPDATE. Now we have the picture shown in Figure 9-3.
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CHAPTER 2: Yet Another Google Reader
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_dataTableContext.AttachTo(_dataTableContext.TableName, entity, "*"); Now it is the time for us to back to our topic of handling updating and deleting data from cloud storage in buckets.
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Users loved the new scheme. All hail single-finger rotation! Yes, a couple of people wanted the old method back, but not many did. Based on some of the video reviews and technical support e-mails I ve read, many people didn t even realize the two-finger rotation was gone. They went along their merry way, placing that second finger, none the wiser that it didn t really do anything at all anymore. I'm going to call that a successful transition!
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Figure 12-10. Attaching the debugger to a running emulator process
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Only two flag values are defined for events, and only one of them can be set explicitly: specialname (0x0200). The event is special in some way, as specified by the name. rtspecialname (0x0400). The event has a special name reserved for the internal use of the common language runtime. This flag can t be set explicitly. The IL disassembler outputs this flag for information purposes, but the IL assembler ignores the keyword. To my knowledge, the primary use of these event flags is to mark deleted events in editand-continue scenarios. When an event record is marked as deleted, both flags are set, and its name is changed to _Deleted. Some compilers, however, might find certain uses for the specialname flag. After all, an event as a metadata item exists solely for the benefit of the compilers.
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These member variables are exposed through public properties. The BindingSourceNode class also provides methods to assist you in any of the following tasks that involve binding or unbinding: Bind Unbind SetEvents ResetBindings These methods wrap standard functionality that you need to perform in the case of saving a bound business object or invoking n-level undo functionality on a bound business object. As I mentioned earlier, when saving or undoing a business object that is participating in Windows Forms data binding, you must first properly unbind the object before acting upon it. The methods exposed by the BindingSourceNode class help you by performing this functionality for you and, more importantly, by taking into account any child BindingSource components that it may contain. Since the BindingSourceNode class uses a recursive design, the helper methods can be called from within any level of the tree, but more often than not, you will be addressing the top-level node. In fact, to avoid any potential n-level undo parent-to-child mismatches, this is the recommended practice. Because the act of saving or invoking an undo operation involves more than one of the helper operations exposed by the BindingSourceNode object, additional methods are typically used from the Windows form. Public Sub Apply() SetEvents(False) Unbind(False) End Sub Public Sub Cancel(ByVal businessObject As Object) SetEvents(False) Unbind(True) Bind(businessObject) End Sub Public Sub Close() SetEvents(False) Unbind(True) End Sub
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Figure 7-1. Base class and derived class
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11: Indexes
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Overly Complex Relationships
The delegate type in this example is called NotifyCalculation and has parameters for the two numbers that have been used for the calculation and the result that was computed. The Calculator class in this example has a constructor argument that takes an instance of the delegate type, which is then invoked inside the CalculateProduct method. The Listing 04 class creates a new instance of Calculator and passes a reference to the static CalculationListener.CalculationPrinter method as the constructor parameter. The delegate is called each time the Calculator.CalculateProduct method is invoked, printing out a notification of the calculation that has been performed. Compiling and running the code in Listing 10-4 produces the following result: Calculation Calculation Calculation Press enter Notification: 10 x 20 = 200 Notification: 2 x 3 = 6 Notification: 20 x 1 = 20 to finish
Once AssignView is displayed, the user can either select a resource or click the Cancel button. If they select a resource, the resource is assigned to the project: protected void GridView2_SelectedIndexChanged( object sender, EventArgs e) { Project obj = GetProject(); try { obj.Resources.Assign(int.Parse( this.GridView2.SelectedDataKey.Value.ToString())); if (SaveProject(obj) > 0) { this.GridView1.DataBind(); this.MultiView1.ActiveViewIndex = (int)Views.MainView; } } catch (InvalidOperationException ex) { ErrorLabel.Text = ex.Message; } } To make the assignment, the current Project object is retrieved. Then the Resources collection s Assign() method is called, passing the SelectedDataKey value from the GridView control as a parameter. This GridView control, which displays the list of resources, has its DataKeyNames property set to Id, so SelectedDataKey returns the Id value of the selected resource. Once the assignment is made, SaveProject() is called to commit the change. If SaveProject() succeeds, it will return a value greater than 0. And in that case, the GridView control in MainView, which displays the list of assigned resources, is told to refresh its data by calling DataBind(). Remember that ASP .NET tries to optimize data access, and so GridView and DetailsView controls don t refresh their data from the data source on every postback. You need to explicitly call DataBind() to force this refresh to occur. Several things could go wrong during this whole process. The resource might already be assigned, or the SaveProject() method could fail due to some data error. Of course, SaveProject() already does its own exception handling and displays any exception messages to the user through the ErrorLabel control. But if the user attempts to assign a duplicate resource to the project, the Assign() method will raise an InvalidOperationException. This is caught and the message text is displayed to the user. Notice that in that case, the user is not sent back to MainView, but remains on AssignView so that they can choose a different resource to assign if desired. The simplest course of action occurs if the user clicks the Cancel LinkButton control: protected void CancelAssignButton_Click( object sender, EventArgs e) { this.MultiView1.ActiveViewIndex = (int)Views.MainView; } In that case, the user is simply directed back to the MainView display.
Literals are numbers or strings typed into the source code that represent a specific, set value of a specific type. For example, the following code shows literals of six types. Notice, for example, the difference between the double literal and the float literal. static void Main() Literals { Console.WriteLine("{0}", 1024); Console.WriteLine("{0}", 3.1416); Console.WriteLine("{0}", 3.1416F); Console.WriteLine("{0}", true); Console.WriteLine("{0}", 'x'); Console.WriteLine("{0}", "Hi there"); } The output of this code is the following: 1024 3.1416 3.1416 True x Hi there Because literals are written into the source code, their values must be known at compile time. Several of the predefined types have their own forms of literal: Type bool has two literals: true and false. For reference type variables, literal null means that the variable is not set to a reference in memory.
Setting the Data Type
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