Runs the specified asynchronous function. - CSharp System.Threading

CSharp examples for System.Threading:SynchronizationContext

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Description

Runs the specified asynchronous function.

Demo Code


using System.Threading.Tasks;
using System.Threading;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System;/*from   w w w  . java  2s. c  o m*/

public class Main{
        /// <summary>Runs the specified asynchronous function.</summary>
        /// <param name="func">The asynchronous function to execute.</param>
        public static void Run(Func<Task> func)
        {
            if (func == null) throw new ArgumentNullException("func");

            var prevCtx = SynchronizationContext.Current;
            try
            {
                // Establish the new context
                var syncCtx = new SingleThreadSynchronizationContext();
                SynchronizationContext.SetSynchronizationContext(syncCtx);

                // Invoke the function and alert the context to when it completes
                var t = func();
                if (t == null) throw new InvalidOperationException("No task provided.");
                t.ContinueWith(delegate { syncCtx.Complete(); }, TaskScheduler.Default);

                // Pump continuations and propagate any exceptions
                syncCtx.RunOnCurrentThread();
                t.GetAwaiter().GetResult();
            }
            finally { SynchronizationContext.SetSynchronizationContext(prevCtx); }
        }
}

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