в 16:40, 26 мая 2010

2010-05-26T16:40:30Z

Admin: 1 версия

2010-05-26T12:54:02Z

1 версия

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==Raise your own event==

<source lang="vbnet">Option Strict On
Public Class Tester
Dim WithEvents Shared acct As Account
Public Shared Sub Main()
Dim warning As MyEventHander = AddressOf Display
Dim bal As Decimal
acct = New Account(200.00d)

bal = acct.Deposit(0.00d)
bal = acct.Debit(400.00d)
bal = acct.Debit(5000.00d)

End Sub
Friend Shared Sub Display(sender As Object,e As MyEventArgs)
Console.WriteLine("Warning: The balance of {0} has fallen below {1}.", _
e.balance, e.WarningLevel)
End Sub
End Class

Public Class MyEventArgs : Inherits EventArgs
Private level As Decimal
Private current As Decimal
Public Sub New(warningLevel As Decimal, currentBalance As Decimal)
Me.level = warningLevel
Me.current = currentBalance
End Sub
Public ReadOnly Property WarningLevel As Decimal
Get
Return level
End Get
End Property
Public ReadOnly Property Balance As Decimal
Get
Return current
End Get
End Property
End Class
Public Delegate Sub MyEventHander(sender As Object, _
e As MyEventArgs)
Public Class Account
Private warningLevel As Decimal
Private balance As Decimal
Public Event MyEvent As MyEventHander

Public Sub New(warningLevel As Decimal)
Me.warningLevel = warningLevel
End Sub
Public Function Deposit(amount As Decimal) As Decimal
balance += amount
RaiseEvent MyEvent(Me, _
New MyEventArgs(warningLevel, balance))
Return balance
End Function
Public Function Debit(amount As Decimal) As Decimal
balance -= amount
RaiseEvent MyEvent(Me, _
New MyEventArgs(warningLevel, balance))
Console.WriteLine("raised")
Return balance
End Function
End Class</source>
<pre class=codeResult>raised
raised</pre>

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VB.Net Tutorial/Event/RaiseEvent - История изменений

в 16:40, 26 мая 2010

Admin: 1 версия