| Handling events in C#
is little bit tricky than in C++ or VB. In C#, you write a delegate
and then write an event handler. These event handlers are overridable
public events defined in the Control or other WinForms classes.
1. Write a Delegate
I want to handle Mouse Down events
and do something when left or right mouse buttons are pressed. Write
this line of code in your InitializeComponent function.
| this.MouseDown
+= new
System.WinForms.MouseEventHandler(this.Form_MouseDown);
|
2. Write the Event
Now you write the event handle.
The output parameter of your event returns
System.WinForms.MouseEventArgs object which gives you the details
about mouse down such as what button is pressed or how many times.
Here are MouseEventArgs members.
MouseEventArgs members
| Button |
Indicates which
mouse button was pressed. It could be Left, Right, Middle, or
None. |
| Clicks |
Indicates the
number of times the mouse button was pressed and released. |
| Delta |
Indicates a signed
count of the number of detents the mouse wheel has rotated. |
| X |
The x-coordinate
of mouse click. |
| Y |
The y-coordinate
of mouse click. |
Event Handler
- private
void Form_MouseDown(object
sender, System.WinForms.MouseEventArgs e)
- {
- switch (e.Button)
- {
- case
MouseButtons.Left:
- MessageBox.Show(this,"Left
Button Click");
- break;
- case
MouseButtons.Right:
- MessageBox.Show(this,"Right
Button Click" );
- break;
- case
MouseButtons.Middle:
- break;
- default:
- break;
- }
-
- }
|
|
