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Throwing an exception causes a significant performance hit A single exception causes lots of runtime stack information to be loaded and processed, data that would not otherwise be loaded, and it takes a considerable amount of time As pointed out in 4, use exceptions only to handle exceptional circumstances; APIs should provide mechanisms to check whether an exception will be thrown instead of forcing a particular API to be called in order to determine whether an exception will be thrown The next chapter introduces generics, a C# 20 feature that significantly enhances the code written in C# 10 In fact, it essentially deprecates any use of the SystemCollections namespace, which was formerly used in nearly every project

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- Returns the grayed state of the given ele-

getGrayedElements()

Figure 16.16 Comparison of average loss through the CPN with Bang-Bang control based on delay and loss.

become more sophisticated, you will need a better way to reuse and customize existing software To facilitate code reuse, especially the reuse of algorithms, C# includes a feature called generics Just as methods are powerful because they can take parameters, classes that take type parameters have significantly more functionality as well, and this is what generics enable Like their predecessor, templates, generics enable the definition of algorithms and pattern implementations once, rather than separately for each type However, C# implements a type-safe version of templates that differs slightly in syntax and greatly in implementation from its predecessors in C++ and Java Note that generics were added to the runtime and C# with version 20

setAllChecked(boolean)

setAllGrayed(boolean)

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c# remove text from pdf

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setChecked(Object, boolean)

setCheckedElements(Object[])

I will begin the discussion of generics by examining a class that does not use generics The class is SystemCollectionsStack, and its purpose is to represent a collection of objects such that the last item to be added to the collection is the first item retrieved from the collection (called last in, first out, or LIFO) Push() and Pop(), the two main methods of the Stack class, add items to the stack and remove them from the stack, respectively The declarations for the Pop() and Push() methods on the stack class appear in Listing 111

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Figure 16.17 Comparison of average delay through the CPN with reinforcement learningbased control using delay and loss as the goal. Where (1) G is a particular game; (2) N = {1, 2, . . . , n} is a nite set of players (decision makers); (3) Ai is the set of actions available to player i; (4) A = A1 A2 An is the action space; and (5) {u i } = {u 1 , u 2 , , u n } is the set of utility (objective) functions that the players wish to maximize.

setGrayed(Object, boolean)

In Listing 54, Employee has been modified to include three fields: FirstName, LastName , and Salary

setGrayedElements(Object[])

0.28 0.26 0.24

The following example creates a table viewer with a label provider, content provider and four columns (see Figure 5-9)

class Employee { public string FirstName; public string LastName; public string Salary; }

Figure 5-9

0.22 0.20 0.18

public class TableViewerExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Table Viewer Example"); shellsetBounds(100, 100, 325, 200); shellsetLayout(new FillLayout()); final TableViewer tableViewer = new TableViewer(

With these fields added, it is possible to store some fundamental data with every Employee instance In this case, you prefix the fields with an access modifier of public public on a field indicates that the data within the field is accessible from classes other than Employee (see the section Access Modifiers, later in this chapter) As with local variable declarations, a field declaration includes the data type to which the field refers Furthermore, it is possible to assign fields an initial value at declaration time, as demonstrated with the Salary field in Listing 55

shell, SWTSINGLE | SWTFULL_SELECTION); final Table table = tableViewergetTable(); tablesetHeaderVisible(true); tablesetLinesVisible(true); String[] columnNames = new String[] { "First Name", "Last Name", "Age", "Num Children"}; int[] columnWidths = new int[] { 100, 100, 35, 75}; int[] columnAlignments = new int[] { SWTLEFT, SWTLEFT, SWTCENTER, SWTCENTER}; for (int i = 0; i < columnNameslength; i++) { TableColumn tableColumn = new TableColumn(table, columnAlignments[i]); tableColumnsetText(columnNames[i]); tableColumnsetWidth(columnWidths[i]); } tableViewersetLabelProvider( new PersonTableLabelProvider()); tableViewersetContentProvider( new ArrayContentProvider()); tableViewersetInput(Personexample()); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }

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