Wait until all threads finished their work in ThreadPool

Question

i have this code:

var list = new List();
for(int i=0;i<10;i++) list.Add(i); 
for(int i=0;i<10;i++)
{
     ThreadPool.QueueUserWorkItem(
             


        

Answer 1

I am not sure if ThreadPool exposes such functionality but you can use wait handles and by the way iterating twice seems unnecessary:

var events = new ManualResetEvent[10];
var list = new List();
for (int i = 0; i < 10; i++)
{
    list.Add(i);
    events[i] = new ManualResetEvent(false);
    int j = i;
    ThreadPool.QueueUserWorkItem(x => {
        Console.WriteLine(x);
        events[j].Set();
    }, list[i]);
}
WaitHandle.WaitAll(events);