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Example of a Generic Method
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There are three shape tools. The one that shows by default is the Rectangle tool (see Figure 2-20). If you click and hold the Rectangle tool or right-click it, you will see the icons for the Ellipse and Line tools, which you can then select. Because you have already seen how the Rectangle tool works, let s move on to the other shape tools.
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if (num1 > 0 && num1 < 100 && num2 > 0 && num2 < 100) { // number is valid - perform calculation return num1 * num2; } else { // throw an exception - the arguments are not valid throw new ArgumentOutOfRangeException(); } } public int CalculateSum(int num1, int num2) { // check that the parameters are valid if (num1 > 0 && num1 < 100 && num2 > 0 && num2 < 100) { // number is valid - perform calculation return num1 + num2; } else { // throw an exception - the arguments are not valid throw new ArgumentOutOfRangeException(); } } public double CalculateRatio(int num1, int num2) { // check that the parameters are valid if (num1 > 0 && num1 < 100 && num2 > 0 && num2 < 100) { // number is valid - perform calculation return num1 / num2; } else { // throw an exception - the arguments are not valid throw new ArgumentOutOfRangeException(); } } } The class in Listing 9-5 contains three methods, each of which calculates a result from two int arguments. We want to make sure that the argument values are within a certain range, so each method performs a range check and throws an exception if they are not. (Exceptions are the C# way of handling errors; you can find more details in 14.) This kind of code duplication in Listing 9-5 is a maintenance risk. If the acceptable range needs to be altered, I have to make three sets of changes one for each method. I may forget to change one or make an incorrect change. We can address this by moving the range validation into a private or protected method, as shown by Listing 9-6. Listing 9-6. Consolidating the Range Validation Logic using System; class MyClass { public int CalculateProduct(int num1, int num2) { // check that the parameters are valid if (CheckRange(num1, num2)) { // number is valid - perform calculation return num1 * num2;
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Figure 2-3. A busy blog post and the corresponding clean news item
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CHAPTER 5 s COMPLETING THE FRAMEWORK
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Class, as I am doing in Figure
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A business object taps into this functionality through methods exposed on BusinessBase. The end result is that a business property is always coded in a consistent manner. In the following example, the highlighted line of code triggers the validation rules behavior: Public Property Name() As String Get If CanReadProperty() Then Return mName Else Throw New System.Security.SecurityException("Property get not allowed") End Get Set(ByVal value As String) If CanWriteProperty() Then If mName <> value Then mName = value PropertyHasChanged() End If Else Throw New System.Security.SecurityException("Property set not allowed") End If End Set End Property You ll see more complete use of the validation rules functionality in 8, during the implementation of the sample application. There are three types of functionality displayed in Figure 2-13. The ValidationRules, RuleHandler, RuleArgs, and ValidationException classes manage the rule methods associated with the properties of an object. The BrokenRulesCollection and BrokenRule classes maintain a list of currently broken validation rules for an object. Finally, the CommonRules class implements a set of commonly used validation rules, such as StringRequired.
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CHAPTER 8 s BUSINESS OBJECT IMPLEMENTATION
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CHAPTER 8 PRIMITIVE TYPES AND SIGNATURES
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CHAPTER 3: Rapid Game Development Using (Mostly) Standard C
Here s the XAML for the hyperlink button shown in Figure 3-12: <HyperlinkButton x:Name="hyperlinkButton" Canvas.Left="45" Canvas.Top="20" Width="200" Content="Click to visit Silverlight website" NavigateUri="http://www.silverlight.net" TargetName="_blank"/>
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Business rules typically alter the state of the object and usually don t enforce validation at the same time. Still, every business rule is implemented as a bit of code, and that code might be trivial or very complex. The .NET Framework provides the delegate concept, making it possible to formally define a method signature for a type of method. A delegate defines a reference type (an object) that represents a method. Essentially, delegates turn methods into objects, allowing you to write code that treats the method like an object; and of course they also allow you to invoke the method. I use this capability in the framework to formally define a method signature for all validation and business rules. This allows the framework to maintain a list of validation rules for each object, enabling relatively simple application of those rules as appropriate. With that done, every object can easily maintain a list of the rules that are broken at any point in time and has a standardized way of implementing business rules.
Did I mention that I am a designer It s my other passion, and sometimes, the two collide ( The deadline is Monday Ugh. I ll be out of town on business for a few days, so . . . ). Add on top of that the fact that I am now happily married and the father of two wonderful daughters, and you can see exactly how much spare time I have to develop iPhone applications. Anyway, I am what many would call a graphic designer. To be more specific, I m an interactive designer, which means I focus my talents in the realm of web and desktop application UI design. I have the good fortune of being able to work out of my home, under my company eddit, inc. It s just me, my home-office, and my clients. I love what I do, but there s just one tiny catch; I ve always been a service provider for others. A client comes a knocking; we form a working relationship, and many projects ensue. It s wonderful to help someone else in leveraging design for their organization, but the work I do is always for others. I needed to develop a product something that was 100 percent my own creation.
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