Question

I want know when all thread has been finished in a multithread program

without something like pooling

while(!allThreadFinished){
thread.sleep(100);
}

The solution should be used Monitor but i can’t how can i approve that it’s correct.
since the “SomeMethod” in the following code using network, it consume times.

public object SomeMethod(string input);
public object[] MultiThreadMethod(string[] inputs) {
            var result = new object[inputs.Count()];
            int i = 0;
            foreach (var item in inputs) {
                BackgroundWorker work = new BackgroundWorker();
                work.DoWork += (sender, doWorkEventArgs) => { doWorkEventArgs.Result = SomeMethod(item); };
                work.RunWorkerCompleted += (sender, runWorkerCompletedEventArgs) => { 
                    result[i] = runWorkerCompletedEventArgs.Result; 
                };
                i++;
                work.RunWorkerAsync();
            }
            /////////////////////////////////////////////////////////////
            //**wait while all thread has been completed**
            /////////////////////////////////////////////////////////////
            return result;
        }

Answer 1

http://msdn.microsoft.com/en-us/library/dd537608.aspx

// Sequential version

foreach (var item in sourceCollection)
    Process(item);

// Parallel equivalent

Parallel.ForEach(sourceCollection, item => Process(item));