WaitAll for multiple handles on a STA thread is not supported 解决方案

封装一个MTA的WaitALL

class MtaWaitAllWrapper {
        readonly WaitHandle[] waitHandles;
        readonly int millisecondsTimeout;
        bool waitResult;
        Exception error;
 
        MtaWaitAllWrapper(int millisecondsTimeout,
            params WaitHandle[] waitHandles) {
 
            if (waitHandles == null) throw new ArgumentNullException(@"waitHandles");
            this.waitHandles = waitHandles;
            this.millisecondsTimeout = millisecondsTimeout;
 
        }
 
        void WaitAll() {
            if ((waitHandles.Length > 1) && (Thread.CurrentThread.GetApartmentState() != ApartmentState.MTA)) {
 
                Thread thread = new Thread(new ThreadStart(OnWaitAll));
                thread.SetApartmentState(ApartmentState.MTA);
                thread.Start();
                thread.Join();
            } else {
                OnWaitAll();
            }
        }
 
        void OnWaitAll() {
            try {
                waitResult = WaitHandle.WaitAll(waitHandles, millisecondsTimeout, false);
            } catch (Exception ex) {
                error = ex;
            }
        }
 
        public static bool WaitAll(int millisecondsTimeout,
            params WaitHandle[] waitHandles) {
 
            MtaWaitAllWrapper waitAllWrapper =
                new MtaWaitAllWrapper(millisecondsTimeout, waitHandles);
 
            waitAllWrapper.WaitAll();
 
            if (waitAllWrapper.error != null) throw waitAllWrapper.error;
 
            return waitAllWrapper.waitResult;
        }
    }