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The mouse device has gone through its own little evolution since it was invented by Xerox Corporation almost 30 years ago. The number of buttons have varied from one to three, and the shape has evolved from a rather uncomfortable rectangle to the hand-fitting contours found in most modern versions. The mouse wheel is a rather recent addition, permitting automated scrolling from the comfort of your mouse. An even newer addition is a five-button mouse, with the extra buttons intended for backward/forward navigation in applications such as web browsers. Regardless of the type mouse you own, the possible events in .NET are the same. In chapter 8 we used the MouseMove event to update the PixelDlg form as the

7:

checked { a = 2; b = 7; result = checked((byte)(a * b)); // this is OK ConsoleWriteLine("Checked result: " + result); a = 127; b = 127; result = checked((byte)(a * b)); // this causes exception ConsoleWriteLine("Checked result: " + result); // won't execute } } catch (OverflowException exc) { ConsoleWriteLine(exc); } } }

The output from the program is shown here:

mouse pointer changed position. In the previous chapter we used the MouseDown event in our MonthCalendar control to pop up a context menu when the user clicked on a date. Here, we look at mouse events in general. Mouse events are somewhat similar to keyboard events. Mouse buttons go down and up just like keyboard keys, and the events MouseDown and MouseUp occur accordingly. Since the mouse also controls the mouse pointer, there are events related to pointer movement as well. The complete list of mouse events is shown in the following table. These events occur with respect to a specific control.

Unchecked result: 1 Unchecked result: 113 Checked result: 14 SystemOverflowException: Arithmetic operation resulted in an overflow at CheckedBlocksMain()

Mouse events Event MouseDown MouseEnter MouseHover MouseLeave MouseMove MouseUp MouseWheel Description Event Argument

As you can see, the unchecked block results in the overflow being truncated When overflow occurred in the checked block, an exception was raised One reason that you may need to use checked or unchecked is that the default checked/unchecked status of overflow is determined by the setting of a compiler option and the execution environment, itself Thus, for some types of programs, it is best to specify the overflow check status explicitly

he earlier chapters of this book have used parts of the C# I/O system, such as ConsoleWriteLine( ), but have done so without much formal explanation Because the I/O system is built upon a hierarchy of classes, it was not possible to present its theory and details without first discussing classes, inheritance, and exceptions Now it is time to examine I/O in detail Because C# uses the I/O system and classes defined by the NET Framework, a discussion of I/O under C# is also a discussion of the NET I/O system, in general This chapter examines both console I/O and file I/O Be forewarned that the I/O system is quite large This chapter describes the most important and commonly used features

Occurs when a mouse button is pressed down while MouseEventArgs class the pointer is over the control. Occurs when the mouse pointer enters the control. Occurs when the mouse pointer remains, or hovers, over a control for a configurable amount of time. Occurs when the mouse pointer leaves the control. Occurs when the mouse pointer moves over the control. Occurs when a mouse button is released while the pointer is over the control. Occurs when the mouse wheel moves while the control has focus. The read-only MouseWheelPresent property in the SystemInformation class indicates whether the operating system believes a mouse wheel is present.

C# programs perform I/O through streams A stream is an abstraction that either produces or consumes information A stream is linked to a physical device by the I/O system All streams behave in the same manner, even if the actual physical devices they are linked to differ Thus, the I/O classes and methods can be applied to many types of devices For example, the same methods that you use to write to the console can also be used to write to a disk file

MouseEventArgs class MouseEventArgs class MouseEventArgs class MouseEventArgs class MouseEventArgs class MouseEventArgs class