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Figure 2-51. The properties section for your new drop shadow effect.
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Each list is just a collection of string values each entry representing a role or group that is allowed or denied access to read or write the property. Each of the four lists is exposed via a readonly property so that AuthorizationRules can interact with the list as needed. More interesting, however, are the methods that compare a user s roles with the list of allowed or denied roles. For instance, the IsReadAllowed() method returns a Boolean indicating whether a user has a role that allows reading of the property:
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This recipe presented a useful way to check whether points or objects are in sight of the camera. However, when you have a larger scene containing plenty of objects, your application can become very slow if you need to perform this test for every single object in your scene. In recipe 2-9, a more robust solution is presented that can handle larger scenes.
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One key aspect of CRC-based design is that an object s responsibility should be short and to the point. Long, complex responsibility descriptions are an indication that the object model is flawed and that the complicated object should probably be represented by a set of simpler objects that collaborate to achieve the goal.
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Getting started was very hard. I wish I could say that I just buckled down and holed up until I learned everything I needed to know about iPhone development, but that s not how it happened. I was a full-time graduate student and could barely devote a few hours a week to the project. I actually paid someone to help me get started with Xcode and programming in C and Objective-C, and I paid a law school student to help me get the business started. All that went quite smoothly and was a great use of money saved up from my previous life as a high school math teacher. I m very happy to have the knowledge and skills I picked up from these people, not to mention a couple more contacts for the future. Those contacts might come in handy if I ever decide to really make an effort at building a software company. Getting help with programming and starting a business was a success. Getting help with designing the application and the icon was another story. I eventually found a great person to work with, but at first, I tried my luck with craigslist. Oops. I won t go into all the details, but I was severely disappointed when the first mock-up of the icon came back. We had agreed on an icon design over the phone that would involve little flashcards, but instead of index cards, the icon mock-up showed flash digital storage cards, like the MicroSD cards that used to come with digital cameras (see Figure 7-4). It turns out that the charming and well-spoken American guy I had talked to on the phone was just a front for an operation based in the Philippines, and something had gotten lost in translation on the way to the artist in Manila. After a similar incident with the phrase idea light bulb, I realized it wasn t going to work. I had paid up front, and that was $100 down the drain.
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Note MobileObject exists to support serialization through the MobileFormatter, which is part of CSLA .NET for Silverlight. CSLA .NET for Silverlight is outside the scope of this book, and MobileObject has no impact on how CSLA .NET works within the .NET runtime.
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CSLA .NET security requires a bit more work, but avoids any necessity for the remote consumer (or its users) to have Windows domain user accounts in your environment. To implement CSLA .NET security, IIS should be left with the default configuration that allows anonymous users to access the virtual root. You must then include code in the web service to ensure that the calling code provides a username and password, which can be validated using the PTPrincipal class in the ProjectTracker.Library just like in the Windows Forms and Web Forms interfaces. The harder question is how to get the username and password from the consumer, and there are two basic approaches to an answer. The first of these is to have each web method include username and password parameters. Each time the consumer calls a web method, it would need to provide values for these two parameters (along with any other parameters the method requires). Within the web method, those two parameters could be passed to PTPrincipal.Login() to see if the credentials are valid. Although this can work, it pollutes the parameter lists of all the web methods. Each method ends up with these two extra parameters that really have nothing to do with the method itself. This is far from ideal. The other approach is to use the SOAP header to pass the information from consumer to server outside the context of the method, but as part of the same exchange of data. In other words, the username and password information will piggyback on the method call, but won t be part of the method call.
Note The buffer cache is a very dynamic area. The output of the script in Listing 12-14 can be misleading if it is
An example of using the properties of this object is shown in Listing 10-4. It simply sets the To address of a SendEMailActivity object to the email address of the person who kicked off the workflow. Listing 10-4. Working with SPWorkflowActivationProperties in C# sendEmailActivity1.To = this.workflowProperties.OriginatorEmail;
To do this, it needs to be able to access the MainForm object. Fortunately VB 2005 supports default instances for forms. If your application has exactly one instance of a specific form, such as MainForm, then you can just refer to it by name anywhere in the project. Using this feature, the MainForm object can be used by any code in the UI, including the StatusBusy class: Public Class StatusBusy Implements IDisposable Private mOldStatus As String Private mOldCursor As Cursor Public Sub New(ByVal statusText As String) mOldStatus = MainForm.StatusLabel.Text MainForm.StatusLabel.Text = statusText mOldCursor = MainForm.Cursor MainForm.Cursor = Cursors.WaitCursor End Sub ' IDisposable Private disposedValue As Boolean = False ' To detect redundant calls Protected Overridable Sub Dispose(ByVal disposing As Boolean) If Not Me.disposedValue Then If disposing Then MainForm.StatusLabel.Text = mOldStatus MainForm.Cursor = mOldCursor End If End If Me.disposedValue = True End Sub Public Sub Dispose() Implements IDisposable.Dispose ' Do not change this code. ' Put cleanup code in Dispose(ByVal disposing As Boolean) above. Dispose(True) GC.SuppressFinalize(Me) End Sub End Class When a StatusBusy object is created, it sets the status text and mouse cursor, storing the old values for later use: mOldStatus = MainForm.StatusLabel.Text MainForm.StatusLabel.Text = statusText mOldCursor = MainForm.Cursor MainForm.Cursor = Cursors.WaitCursor Then, when the object is disposed, the status text and cursor are reset to their previous values: MainForm.StatusLabel.Text = mOldStatus MainForm.Cursor = mOldCursor This is one of the simplest ways to implement powerful status notification and cursor handling for the user in a Windows Forms UI.
All business objects must be unanchored so that they can move across the network as needed. This means that they must be marked as serializable by using the <Serializable()> attribute, as shown here: <Serializable()> _ Public Class MyBusinessClass End Class This is required for all business classes that inherit from any of the CSLA .NET base classes. It s also required for any objects that are referenced by business objects. If a business object references an object that isn t serializable, then you must be sure to mark its field with the <NonSerialized()> attribute to prevent the serialization process from attempting to serialize that object. If you don t do this, the result will be a runtime exception from the .NET Framework.
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