本文整理匯總了VB.NET中System.Threading.Tasks.Task.Wait方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET Task.Wait方法的具體用法？VB.NET Task.Wait怎麽用？VB.NET Task.Wait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的用法示例。
在下文中一共展示了Task.Wait方法的5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.Threading.Tasks
Module Example
Public Sub Main()
Dim t As Task = Task.Run( Sub()
Dim rnd As New Random()
Dim sum As Long
Dim n As Integer = 5000000
For ctr As Integer = 1 To n
Dim number As Integer = rnd.Next(0, 101)
sum += number
Next
Console.WriteLine("Total: {0:N0}", sum)
Console.WriteLine("Mean: {0:N2}", sum/n)
Console.WriteLine("N: {0:N0}", n)
End Sub)
Dim ts As TimeSpan = TimeSpan.FromMilliseconds(150)
If Not t.Wait(ts) Then
Console.WriteLine("The timeout interval elapsed.")
End If
End Sub
End Module輸出：
Total: 50,015,714 Mean: 50.02 N: 1,000,000 Or it displays the following output: The timeout interval elapsed.
示例2: Example
' 導入命名空間
Imports System.Threading
Imports System.Threading.Tasks
Module Example
Public Sub Main()
Dim ts As New CancellationTokenSource()
Dim thread As New Thread(AddressOf CancelToken)
thread.Start(ts)
Dim t As Task = Task.Run( Sub()
Task.Delay(5000).Wait()
Console.WriteLine("Task ended delay...")
End Sub)
Try
Console.WriteLine("About to wait completion of task {0}", t.Id)
Dim result As Boolean = t.Wait(1510, ts.Token)
Console.WriteLine("Wait completed normally: {0}", result)
Console.WriteLine("The task status: {0:G}", t.Status)
Catch e As OperationCanceledException
Console.WriteLine("{0}: The wait has been canceled. Task status: {1:G}",
e.GetType().Name, t.Status)
Thread.Sleep(4000)
Console.WriteLine("After sleeping, the task status: {0:G}", t.Status)
ts.Dispose()
End Try
End Sub
Private Sub CancelToken(obj As Object)
Thread.Sleep(1500)
Console.WriteLine("Canceling the cancellation token from thread {0}...",
Thread.CurrentThread.ManagedThreadId)
If TypeOf obj Is CancellationTokenSource Then
Dim source As CancellationTokenSource = CType(obj, CancellationTokenSource)
source.Cancel()
End If
End Sub
End Module
' The example displays output like the following if the wait is canceled by
' the cancellation token:
' About to wait completion of task 1
' Canceling the cancellation token from thread 3...
' OperationCanceledException: The wait has been canceled. Task status: Running
' Task ended delay...
' After sleeping, the task status: RanToCompletion
' The example displays output like the following if the wait is canceled by
' the timeout interval expiring:
' About to wait completion of task 1
' Wait completed normally: False
' The task status: Running
' Canceling the cancellation token from thread 3...示例3: Example
' 導入命名空間
Imports System.Threading
Imports System.Threading.Tasks
Module Example
Public Sub Main()
Dim ts As New CancellationTokenSource()
Dim t = Task.Run( Sub()
Console.WriteLine("Calling Cancel...")
ts.Cancel()
Task.Delay(5000).Wait()
Console.WriteLine("Task ended delay...")
End Sub)
Try
Console.WriteLine("About to wait for the task to complete...")
t.Wait(ts.Token)
Catch e As OperationCanceledException
Console.WriteLine("{0}: The wait has been canceled. Task status: {1:G}",
e.GetType().Name, t.Status)
Thread.Sleep(6000)
Console.WriteLine("After sleeping, the task status: {0:G}", t.Status)
End Try
ts.Dispose()
End Sub
End Module輸出：
About to wait for the task to complete... Calling Cancel... OperationCanceledException: The wait has been canceled. Task status: Running Task ended delay... After sleeping, the task status: RanToCompletion
示例4: Example
' 導入命名空間
Imports System.Threading.Tasks
Module Example
Public Sub Main()
Dim t As Task = Task.Run( Sub()
Dim rnd As New Random()
Dim sum As Long
Dim n As Integer = 5000000
For ctr As Integer = 1 To n
Dim number As Integer = rnd.Next(0, 101)
sum += number
Next
Console.WriteLine("Total: {0:N0}", sum)
Console.WriteLine("Mean: {0:N2}", sum/n)
Console.WriteLine("N: {0:N0}", n)
End Sub)
If Not t.Wait(150) Then
Console.WriteLine("The timeout interval elapsed.")
End If
End Sub
End Module輸出：
Total: 50,015,714 Mean: 50.02 N: 1,000,000 Or it displays the following output: The timeout interval elapsed.
示例5: Example
' 導入命名空間
Imports System.Threading.Tasks
Module Example
Public Sub Main()
Dim t As Task = Task.Run( Sub()
Dim rnd As New Random()
Dim sum As Long
Dim n As Integer = 1000000
For ctr As Integer = 1 To n
Dim number As Integer = rnd.Next(0, 101)
sum += number
Next
Console.WriteLine("Total: {0:N0}", sum)
Console.WriteLine("Mean: {0:N2}", sum/n)
Console.WriteLine("N: {0:N0}", n)
End Sub)
t.Wait()
End Sub
End Module輸出：
Total: 50,015,714 Mean: 50.02 N: 1,000,000