в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:15:38Z

1 версия

Новая страница

==Generic events==

<source lang="csharp">using System;

class MyEventArgs : EventArgs {
public int eventnum;
}

delegate void MyEventHandler<T, V>(T source, V args);

class MyEvent {
static int count = 0;

public event MyEventHandler<MyEvent, MyEventArgs> SomeEvent;

public void OnSomeEvent() {
MyEventArgs arg = new MyEventArgs();

if(SomeEvent != null) {
arg.eventnum = count++;
SomeEvent(this, arg);
}
}
}

class KeyBorardEventHandler {
public void handler<T, V>(T source, V arg) where V : MyEventArgs {
Console.WriteLine("Event " + arg.eventnum +
" received by an KeyBorardEventHandler object.");
Console.WriteLine("Source is " + source);
Console.WriteLine();
}
}

class MouseEventHandler {
public void handler<T,V>(T source, V arg) where V : MyEventArgs {
Console.WriteLine("Event " + arg.eventnum +
" received by a MouseEventHandler object.");
Console.WriteLine("Source is " + source);
Console.WriteLine();
}
}

class UseGenericEventDelegate {
public static void Main() {
KeyBorardEventHandler ob1 = new KeyBorardEventHandler();
MouseEventHandler ob2 = new MouseEventHandler();
MyEvent evt = new MyEvent();

// Add handler() to the event list.
evt.SomeEvent += ob1.handler;
evt.SomeEvent += ob2.handler;

// Fire the event.
evt.OnSomeEvent();
evt.OnSomeEvent();
}
}</source>
<pre class=codeResult>Event 0 received by an KeyBorardEventHandler object.
Source is MyEvent
Event 0 received by a MouseEventHandler object.
Source is MyEvent
Event 1 received by an KeyBorardEventHandler object.
Source is MyEvent
Event 1 received by a MouseEventHandler object.
Source is MyEvent</pre>

==Get event source from event arguments==

<source lang="csharp">using System;
using System.Windows.Forms;
using System.Drawing;

class GetEventSourceFromEventArguments : Form {
Button MyButton = new Button();

public GetEventSourceFromEventArguments() {
Text = "Respond to a Button";

MyButton = new Button();
MyButton.Text = "Press Here";
MyButton.Location = new Point(100, 200);

// Add button event handler to list.
MyButton.Click += MyButtonClick;

Controls.Add(MyButton);
}

[STAThread]
public static void Main() {
GetEventSourceFromEventArguments skel = new GetEventSourceFromEventArguments();

Application.Run(skel);
}

// Handler for MyButton.
protected void MyButtonClick(object who, EventArgs e) {
Button b = (Button) who;

if(b.Top == 200)
b.Location = new Point(10, 10);
else
b.Location = new Point(100, 200);
}
}</source>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/CSharp Tutorial/GUI Windows Forms/Generic Event - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия