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The steps to create a child object that doesn t need to load itself with default values from the database are as follows: 1. The factory method (Friend scope) is called. 2. The factory method calls DataPortal.CreateChild(), which creates an instance of the child object and marks it as a child. 3. The child object does any initialization in the Child_Create() method. 4. The child object is returned. 5. From the child object s perspective, two methods are called, as follows: Default constructor Child_Create() This is illustrated in Figure 4-7.
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You can implement different catch blocks to handle different exception types separately: try { ... } catch(IOException) { ... } catch(NotSupportedException) { ... } catch(Exception) { ... } Make sure that the catch block for the most general exception comes at the end; otherwise, the special catch blocks are never executed. The catch blocks will be checked in the order of appearance, and as soon as one block applies, the others are ignored. In the preceding example, the first catch block will handle all exceptions that derive from IOException. Placing
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These are the parameters you want to pay particularly close attention to. With the introduction of locally managed tablespaces, which are highly recommended, I find that the rest of the storage parameters (such as PCTINCREASE, NEXT, and so on) are simply not relevant anymore.
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Class that provides access to important application context information; used by the framework, business classes, and UI code Base class from which editable root, child, and switchable objects inherit Base class from which editable root and child list objects inherit Base class from which command objects inherit Base class from which custom criteria objects inherit Class that exposes the data portal functionality to the client Base class from which dynamic list objects inherit Base class from which name/value list objects inherit Class that defines metadata for each business object property Base class from which read-only root and child objects inherit Base class from which read-only root and child list objects inherit Class that provides a single value criteria for any object Type that extends DateTime to add the concept of an empty date and other features Type that includes utility methods used by other classes
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Next, you will need a method that creates the orthogonal View matrix and renders the model. This will be done in the RenderModel method. As always, to render the 3D model, you need World, View, and Projection matrices. Using a World matrix can be useful in cases when the origin of the Model does not exactly match the center of the BoundingSphere. This is usually the case, for example, when the model is asymmetric. Because you want the depth map to have the real center of the Model in its center, you will translate the model by positioning the center of the BoundingSphere in the (0,0,0) 3D origin point. Here is the code that defines your View matrix: private void RenderModel() { BoundingSphere modelSphere = (BoundingSphere)myModel.Tag; Vector3 camPosition = new Vector3(0,0,-modelSphere.Radius-10); Matrix viewMatrix = Matrix.CreateLookAt(camPosition, new Vector3(0,0,0), new Vector3(0,1,0)); } Because you will later set the World matrix so the center of the Model will be in the (0,0,0) 3D origin, this 3D origin will be the target of your camera. You will position the camera in front of the model, thus on the negative z-axis. Because in orthographic projection distance does not have an impact on how big the model is presented on the screen, it does not matter exactly where you position the camera on the negative z-axis, as long as you make sure the camera is not inside the model! Since the maximum size of the model from its center is contained in the modelSphere.Radius property, you position the camera at the (0,0,-modelSphere.Radius-10) position. Because you don t want your camera to add a rotation to your screen, you take the (0,1,0) World Up vector as the Up vector for your camera. Next is the definition of your projection matrix, which you will create by using the Matrix. CreateOrthographic method. The first two arguments are the width and the height of the viewing frustum, which corresponds to the distance between the parallel lines in the right side of Figure 2-17. Because you want the volume to exactly fit around the BoundingSphere of your model, you specify two times its radius (since the radius equals half the width of the sphere).
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Open the Module1.vb file and add a dictionary called parms to add parameters, the same as was done in 2. The beginning of Sub Main looks like the following: Shared Sub Main() Dim workflowRuntime As New WorkflowRuntime() AddHandler workflowRuntime.WorkflowCompleted, AddressOf OnWorkflowCompleted AddHandler workflowRuntime.WorkflowTerminated, AddressOf OnWorkflowTerminated Dim parms As Dictionary(Of String, Object) = New Dictionary(Of String, Object) To make this and future examples a little more interactive, add the following two lines: Console.WriteLine("Input value:") parms.Add("InputValue", Cint(Console.ReadLine())) The first line prompts the user for an input value, and the second line reads in the input and adds it to the dictionary with a key of InputValue. The Console.Readline waits for the user s input, so you don t need to worry about pausing. The CInt function call is required to convert the value read from the line on the console to an integer, because the public property InputValue is expecting an integer. If you don t have this CInt function call, the workflow will fail. Finally, add the parms parameter to the CreateWorkflow line: workflowInstance = workflowRuntime.CreateWorkflow(GetType(Workflow1), parms) Again, this passes the dictionary of parameters to the workflow. The completed Sub Main follows: Shared Sub Main() Dim workflowRuntime As New WorkflowRuntime() AddHandler workflowRuntime.WorkflowCompleted, AddressOf OnWorkflowCompleted AddHandler workflowRuntime.WorkflowTerminated, AddressOf OnWorkflowTerminated Dim parms As Dictionary(Of String, Object) = New Dictionary(Of String, Object) Console.WriteLine("Input value:") parms.Add("InputValue", CInt(Console.ReadLine())) Dim workflowInstance As WorkflowInstance workflowInstance = workflowRuntime.CreateWorkflow(GetType(Workflow1), parms) workflowInstance.Start() WaitHandle.WaitOne() End Sub Next, drag and drop an IfElse activity from the Toolbox onto the Workflow1 Workflow Designer. Leave the IfElse activity name as the default, but change the left IfElseBranchActivity to Branch1 and the right to Branch2, so your Workflow Designer looks like Figure 3-1.
Developers new to C++/CLI sometimes confuse managed classes and native classes whose member functions are compiled to managed code. Even when all member functions of a C++ class are compiled to managed code, the resulting class is still a C++ type, not a managed type. However, compiling all member functions of a native class to managed code can imply a native-managed transition if native code calls a member function of the native class. The application shown in Figure 9-4 gives an example:
Event Declaration
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