в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:15:40Z

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==Inference And Contravariance for Button Click, KeyPress, and MouseClick==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.ruponentModel;
class InferenceAndContravariance
{
static void LogPlainEvent(object sender, EventArgs e)
{
Console.WriteLine ("An event occurred");
}
static void Main()
{
Button button = new Button();
button.Text = "Click me";
button.Click += LogPlainEvent;
button.KeyPress += LogPlainEvent;
button.MouseClick += LogPlainEvent;
Form form = new Form();
form.AutoSize = true;
form.Controls.Add(button);
Application.Run(form);
}
}</source>

==Use .Net event system==

<source lang="csharp">using System;
public class SalaryEvent : EventArgs
{
public string Message;
public SalaryEvent(string message)
{
this.Message = message;
}
}
public class Employee
{
private int salary;
public delegate void SalaryTaxEventHandler( object reactor, SalaryEvent myEvent );
public event SalaryTaxEventHandler OnTax;
public int Salary
{
set
{
salary = value;
if (salary > 1000)
{
SalaryEvent myEvent = new SalaryEvent("Employee meltdown in progress!");
OnTax(this, myEvent);
}
}
}
}
public class EmployeeMonitor
{
public EmployeeMonitor(Employee myEmployee)
{
myEmployee.OnTax += new Employee.SalaryTaxEventHandler(DisplayMessage);
}
public void DisplayMessage( object myEmployee, SalaryEvent myEvent )
{
Console.WriteLine(myEvent.Message);
}
}

class MainClass
{
public static void Main()
{
Employee myEmployee = new Employee();
EmployeeMonitor myEmployeeMonitor = new EmployeeMonitor(myEmployee);
myEmployee.Salary = 100;
myEmployee.Salary = 500;
myEmployee.Salary = 2000;
}
}</source>
<pre class=codeResult>Employee meltdown in progress!</pre>

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в 15:31, 26 мая 2010

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