在這個帖子中提及了執行緒等待的問題，原方法是用迴圈判斷執行緒狀態來決定是否繼續執行的思路。這種方法的主要問題是浪費資源，雖然用Sleep可以減少cpu的佔用量，但遠不如用事件通知的方法來的優雅。

下面貼出基於事件通知的執行緒等待的程式碼，完全可以舉一反三。

(魏滔序原創，轉帖請註明出處。)

Imports System Imports System.Threading Public Class ThreadClass Private Shared Event Completed As EventHandler Private Shared ThreadCount1 As Integer = 11 '建立11個執行緒 Private Shared ThreadCount2 As Integer = 0 Public Shared Sub Main() Dim Thread As Thread ThreadCount2 = 0 '事件與過程繫結 AddHandler Completed, AddressOf ThreadCompleted '建立並執行執行緒 For i As Integer = 1 To ThreadCount1 Thread = New Thread(New ParameterizedThreadStart(AddressOf ThreadProcess)) Thread.Start(i) Next Console.ReadKey() End Sub '每個執行緒結束的時候都要呼叫的事件 Private Shared Sub ThreadCompleted(ByVal sender As Object, ByVal e As EventArgs) ThreadCount2 += 1 If ThreadCount1 = ThreadCount2 Then Console.WriteLine("這是所有執行緒執行完才執行的內容") End If End Sub '執行緒處理過程 Private Shared Sub ThreadProcess(ByVal parameter As Object) For i As Integer = 0 To 100 Console.WriteLine("這是執行緒{0}中執行的內容", parameter.ToString) Next '觸發事件 RaiseEvent Completed(Nothing, Nothing) End Sub End Class