本文整理匯總了VB.NET中System.Threading.Tasks.Task<TResult>.ContinueWith方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET Task<TResult>.ContinueWith方法的具體用法？VB.NET Task<TResult>.ContinueWith怎麽用？VB.NET Task<TResult>.ContinueWith使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Threading.Tasks.Task<TResult>的用法示例。
在下文中一共展示了Task<TResult>.ContinueWith方法的4個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: Example
' 導入命名空間
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks
Imports Timers = System.Timers
Module Example
Dim ts As CancellationTokenSource
Public Sub Main(args() As String)
Dim upperBound As Integer = If(args.Length >= 1, CInt(args(0)), 200)
ts = New CancellationTokenSource()
Dim token As CancellationToken = ts.Token
Dim timer As New Timers.Timer(100)
AddHandler timer.Elapsed, AddressOf TimedOutEvent
timer.AutoReset = False
timer.Enabled = True
Dim t1 = Task.Run(Function()
' True = composite.
' False = prime.
Dim values(upperBound) As Boolean
For ctr = 2 To CInt(Math.Sqrt(upperBound))
If values(ctr) = False Then
For product = ctr * ctr To upperBound Step ctr
values(product) = True
Next
End If
token.ThrowIfCancellationRequested()
Next
Return values
End Function, token)
Dim t2 = t1.ContinueWith(Sub(antecedent)
' Create a list of prime numbers.
Dim primes As New List(Of Integer)()
token.ThrowIfCancellationRequested()
Dim numbers As Boolean() = antecedent.Result
Dim output As String = String.Empty
For ctr As Integer = 1 To numbers.GetUpperBound(0)
If numbers(ctr) = False Then primes.Add(ctr)
Next
' Create the output string.
For ctr As Integer = 0 To primes.Count - 1
token.ThrowIfCancellationRequested()
output += primes(ctr).ToString("N0")
If ctr < primes.Count - 1 Then output += ", "
If (ctr + 1) Mod 8 = 0 Then output += vbCrLf
Next
'Display the result.
Console.WriteLine("Prime numbers from 1 to {0}:{1}",
upperBound, vbCrLf)
Console.WriteLine(output)
End Sub, token)
Try
t2.Wait()
Catch ae As AggregateException
For Each e In ae.InnerExceptions
If e.GetType Is GetType(TaskCanceledException) Then
Console.WriteLine("The operation was cancelled.")
Else
Console.WriteLine("{0}: {1}", e.GetType().Name, e.Message)
End If
Next
Finally
ts.Dispose()
End Try
End Sub
Private Sub TimedOutEvent(source As Object, e As Timers.ElapsedEventArgs)
ts.Cancel()
End Sub
End Module
' If cancellation is not requested, the example displays output like the following:
' Prime numbers from 1 to 400:
'
' 1, 2, 3, 5, 7, 11, 13, 17,
' 19, 23, 29, 31, 37, 41, 43, 47,
' 53, 59, 61, 67, 71, 73, 79, 83,
' 89, 97, 101, 103, 107, 109, 113, 127,
' 131, 137, 139, 149, 151, 157, 163, 167,
' 173, 179, 181, 191, 193, 197, 199, 211,
' 223, 227, 229, 233, 239, 241, 251, 257,
' 263, 269, 271, 277, 281, 283, 293, 307,
' 311, 313, 317, 331, 337, 347, 349, 353,
' 359, 367, 373, 379, 383, 389, 397, 401
' If cancellation is requested, the example displays output like the following:
' The operation was cancelled.示例2: Example
' 導入命名空間
Imports System.Threading
Imports System.Threading.Tasks
Module Example
Public Sub Main()
Dim cts As New CancellationTokenSource()
Dim token As CancellationToken = cts.Token
' Get an integer to generate a list of its exponents.
Dim rnd As New Random()
Dim number As Integer = rnd.Next(2, 21)
Dim t = Task.Factory.StartNew( Function(value)
Dim n As Integer = CInt(value)
Dim values(9) As Long
For ctr As Integer = 1 To 10
values(ctr - 1) = CLng(Math.Pow(n, ctr))
Next
return values
End Function, number)
Dim continuation = t.ContinueWith( Sub(antecedent, value)
Console.WriteLine("Exponents of {0}:", value)
For ctr As Integer = 0 To 9
Console.WriteLine(" {0} {1} {2} = {3:N0}",
value, ChrW(&h02C6), ctr + 1,
antecedent.Result(ctr))
Next
Console.WriteLine()
End Sub, number)
continuation.Wait()
cts.Dispose()
End Sub
End Module輸出：
Exponents of 2: 2 ^ 1 = 2 2 ^ 2 = 4 2 ^ 3 = 8 2 ^ 4 = 16 2 ^ 5 = 32 2 ^ 6 = 64 2 ^ 7 = 128 2 ^ 8 = 256 2 ^ 9 = 512 2 ^ 10 = 1,024
示例3: Example
' 導入命名空間
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks
Module Example
Public Sub Main(args() As String)
Dim upperBound As Integer = If(args.Length >= 1, CInt(args(0)), 200)
Dim t1 = Task.Run(Function()
' True = composite.
' False = prime.
Dim values(upperBound) As Boolean
For ctr = 2 To CInt(Math.Sqrt(upperBound))
If values(ctr) = False Then
For product = ctr * ctr To upperBound Step ctr
values(product) = True
Next
End If
Next
Return values
End Function)
Dim t2 = t1.ContinueWith(Sub(antecedent)
' Create a list of prime numbers.
Dim primes As New List(Of Integer)()
Dim numbers As Boolean() = antecedent.Result
Dim output As String = String.Empty
For ctr As Integer = 1 To numbers.GetUpperBound(0)
If numbers(ctr) = False Then primes.Add(ctr)
Next
' Create the output string.
For ctr As Integer = 0 To primes.Count - 1
output += primes(ctr).ToString("N0")
If ctr < primes.Count - 1 Then output += ", "
If (ctr + 1) Mod 8 = 0 Then output += vbCrLf
Next
'Display the result.
Console.WriteLine("Prime numbers from 1 to {0}:{1}",
upperBound, vbCrLf)
Console.WriteLine(output)
End Sub)
Try
t2.Wait()
Catch ae As AggregateException
For Each e In ae.InnerExceptions
Console.WriteLine("{0}: {1}", e.GetType().Name, e.Message)
Next
End Try
End Sub
End Module輸出：
Prime numbers from 1 to 400: 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401 If cancellation is requested, the example displays output like the following: The operation was cancelled.
示例4: ContinuationState
' 導入命名空間
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks
' Demonstrates how to associate state with task continuations.
Public Module ContinuationState
' Simluates a lengthy operation and returns the time at which
' the operation completed.
Public Function DoWork() As Date
' Simulate work by suspending the current thread
' for two seconds.
Thread.Sleep(2000)
' Return the current time.
Return Date.Now
End Function
Public Sub Main()
' Start a root task that performs work.
Dim t As Task(Of Date) = Task(Of Date).Run(Function() DoWork())
' Create a chain of continuation tasks, where each task is
' followed by another task that performs work.
Dim continuations As New List(Of Task(Of DateTime))()
For i As Integer = 0 To 4
' Provide the current time as the state of the continuation.
t = t.ContinueWith(Function(antecedent, state) DoWork(), DateTime.Now)
continuations.Add(t)
Next
' Wait for the last task in the chain to complete.
t.Wait()
' Display the creation time of each continuation (the state object)
' and the completion time (the result of that task) to the console.
For Each continuation In continuations
Dim start As DateTime = CDate(continuation.AsyncState)
Dim [end] As DateTime = continuation.Result
Console.WriteLine("Task was created at {0} and finished at {1}.",
start.TimeOfDay, [end].TimeOfDay)
Next
End Sub
End Module輸出：
Task was created at 10:56:21.1561762 and finished at 10:56:25.1672062. Task was created at 10:56:21.1610677 and finished at 10:56:27.1707646. Task was created at 10:56:21.1610677 and finished at 10:56:29.1743230. Task was created at 10:56:21.1610677 and finished at 10:56:31.1779883. Task was created at 10:56:21.1610677 and finished at 10:56:33.1837083.