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[STAThread] static void Main() { ButtonForm skel = new ButtonForm(); ApplicationEnableVisualStyles(); ApplicationRun(skel); } // Handler for MyButton void MyButtonClick(object who, EventArgs e) { if(MyButtonTop == 200) MyButtonLocation = new Point(10, 10); else MyButtonLocation = new Point(100, 200); } }
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Let s look closely at the event-handling code in this program The event handler for the button click is shown here:
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// Handler for MyButton void MyButtonClick(object who, EventArgs e) { if(MyButtonTop == 200) MyButtonLocation = new Point(10, 10); else MyButtonLocation = new Point(100, 200); }
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MyButtonClick( ) is compatible with the EventHandler delegate shown earlier, which means it can be added to the Click event chain Notice it is private to ButtonForm This is not technically necessary, but it is a good idea because event handlers are not intended to be called except in response to events Inside the handler, the location of the top of the button is determined from the Top property All controls define the following properties, which specify the coordinates of the upper-left and lower-right corners: public int Top { get; set; } public int Bottom { get; } public int Left { get; set; } public int Right { get; } Notice that the location of the control can be changed by setting Top and Left, but not by setting Bottom and Right because they are read-only (To change the size of a control, you can use the Width and Height properties) When the button click event is received, if the top of the control is at its original location of 200, the location is changed to 10, 10 Otherwise, it is returned to its original location of 100, 200 Therefore, each time you click the button, the location of the button changes Before MyButtonClick( ) can receive messages, it must be added to the event handler chain linked to the button s Click event This is done inside the ButtonForm constructor, using this statement:
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MyButtonClick += MyButtonClick;
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After the method is added to the Click event, each time the button is clicked, MyButtonClick( ) is called
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An Alternative Implementation
As a point of interest, MyButtonClick( ) could have been written in a slightly different way Recall that the who parameter of an event handler receives a reference to the object that generated the call In the case of a button click event, this is the button that was clicked Thus, MyButtonClick( ) could have been written like this:
// An Alternative button handler void MyButtonClick(object who, EventArgs e) { Button b = (Button) who; if(bTop == 200) bLocation = new Point(10, 10); else bLocation = new Point(100, 200); }
In this version, who is cast to Button, and this reference (rather than the MyButton field) is used to access the button object Although there is no advantage to this approach in this case, it is easy to imagine situations in which it would be quite valuable For example, such an approach allows a button event handler to be written independently of any specific button
Using a Message Box
One of the most used built-in features of Windows is the message box A message box is a predefined window that lets you display a message You can also obtain simple responses from the user, such as Yes, No, or OK In a form-based program, a message box is supported by the MessageBox class You don t create an object of that class, however Instead, to display a message box, call the static method Show( ), which is defined by MessageBox The Show( ) method has several forms The one we will be using is shown here: public static DialogResult Show(string msg, string caption, MessageBoxButtons mbb) The string passed through msg is displayed in the body of the box The caption of the message box window is passed in caption The buttons that will be displayed are specified by mbb The user s response is returned MessageBoxButtons is an enumeration that defines the following values:
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