vb.net多執行緒同步呼叫例項
阿新 • • 發佈：2019-01-26
Imports System.Threading
'看名字就知道，這個類幹什麼用的，多執行緒應用程式都要用這個類
Public Delegate Function
BinaryOp(ByVal x As Integer, ByVal y As Integer) As Integer
Module Module1
Sub main()
Console.WriteLine("***** Async Delegate Invocation *****")
' Print
out the ID of the executing thread.
Console.WriteLine("Main() invoked on thread {0}.",
Thread.CurrentThread.ManagedThreadId)
Dim b As
New BinaryOp(AddressOf Add)
Dim iftAR
As IAsyncResult = b.BeginInvoke(10, 10, Nothing, Nothing)
' This
message will keep printing until
' the
Add() method is finished.
Do While
Not iftAR.IsCompleted
Console.WriteLine("Doing more
work in Main()!")
Thread.Sleep(1000)
Loop
' Now we
know the Add() method is complete.
Dim answer
As Integer = b.EndInvoke(iftAR)
Console.WriteLine("10 + 10 is {0}.", answer)
Console.ReadLine()
End Sub
Private Function Add(ByVal x As Integer, ByVal y
As Integer) As Integer
' Print
out the ID of the executing thread.
Console.WriteLine("Add() invoked on thread {0}.",
Thread.CurrentThread.ManagedThreadId)
' Pause to
simulate a lengthy operation.
Thread.Sleep(5000)
Return x +
y
End Function
End Module