Stephens' C# Programming with Visual Studio® 2010 24-Hour Trainer

Exercises

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329

Note that there are many ways to do this sort of thing. For example, Lesson 37

explains how you can use LINQ to sort items. As with all of the examples and

exercises in this book, these examples are primarily designed to demonstrate par-

ticular topics, in this case interfaces, rather than to provide the perfect solution.

3. If you set a ListView control’s ListViewItemSorter property equal to an object that imple-

ments the

System.Collections.IComparer interface, then the ListView uses that object to

sort its rows. To sort the rows, the control calls the object’s

Compare method, passing it two

ListViewItem objects. (Unfortunately the ListView control’s ListViewItemSorter prop-

erty is a non-generic

IComparer, so it works with non-specific objects instead of something

more concrete like

ListViewItems.)

For this exercise, make a program with a

ListView control similar to the one shown in

Figure 27-6. At design time, edit the

ListView’s Columns collection to define the columns.

Edit its

Items collection to define the data and set the control’s View property to Details.

FIGURE 276

Next make a ListViewComparer class that implements System.Collections.IComparer.

Give it a

ColumnNumber property that indicates the number of the column in the ListView

that the object should use when sorting.

Finally give the

ListView a ColumnClick event handler. The event handler should create ...