What is a replacement method for Task.Run in .NET 4.0 using C#?

Question

I got this program that gives me syntax error "System.Threading.Tasks.task does not contain a definition for Run."

I am using VB 2010 .NET 4.0 Any ideas? any replacements for Run in .net 4.0?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ChatApp
{
class ChatProg
{
    static void Main(string[] args)
    {
        Task<int> wakeUp = DoWorkAsync(2000,"Waking up");
        Task.WaitAll(wakeUp);
    }

    static Task<int> DoWorkAsync(int milliseconds, string name)
    {

        //error appears below on word Run
        return Task.Run(() =>
            {
                Console.WriteLine("* starting {0} work", name);
                Thread.Sleep(milliseconds);
                Console.WriteLine("* {0} work one", name);
                return 1;
            });
    }
}
}

Solution 1

It looks like Task.Factory.StartNew<T> is what you're after.

return Task.Factory.StartNew<int>(() => {
    // ...
    return 1;
});

Since the compiler can infer the return type, this also works:

return Task.Factory.StartNew(() => {
    // ...
    return 1;
});

Solution 2

The highest voted answer, unfortunately, is not exactly correct:

Unfortunately, the only overloads for StartNew that take a TaskScheduler also require you to specify the CancellationToken and TaskCreationOptions. This means that in order to use Task.Factory.StartNew to reliably, predictably queue work to the thread pool, you have to use an overload like this:

Task.Factory.StartNew(A, CancellationToken.None, TaskCreationOptions.DenyChildAttach, TaskScheduler.Default);

So the closest thing to Task.Run in 4.0 is something like:

/// <summary>
/// Starts the new <see cref="Task"/> from <paramref name="function"/> on the Default(usually ThreadPool) task scheduler (not on the TaskScheduler.Current).
/// It is a 4.0 method nearly analogous to 4.5 Task.Run.
/// </summary>
/// <typeparam name="T">The type of the return value.</typeparam>
/// <param name="factory">The factory to start from.</param>
/// <param name="function">The function to execute.</param>
/// <returns>The task representing the execution of the <paramref name="function"/>.</returns>
public static Task<T> StartNewOnDefaultScheduler<T>(this TaskFactory factory, Func<T> function)
{
    Contract.Requires(factory != null);
    Contract.Requires(function != null);

    return factory
        .StartNew(
            function,
            cancellationToken: CancellationToken.None,
            creationOptions: TaskCreationOptions.None,
            scheduler: TaskScheduler.Default);
}

that can be used like:

Task
    .Factory
    .StartNewOnDefaultScheduler(() => 
        result);

Solution 3

I changed your code with Task.Factory.StartNew check detail link

 static Task<int> DoWorkAsync(int milliseconds, string name)
        {


            //error appears below on word Run
            return   Task.Factory.StartNew(() =>
            {
                Console.WriteLine("* starting {0} work", name);
                Thread.Sleep(milliseconds);
                Console.WriteLine("* {0} work one", name);
                return 1;
            });
        }

Solution 4

In case you're using Microsoft.Bcl.Async here you go:

return TaskEx.Run(() =>
{
    Console.WriteLine("* starting {0} work", name);
    Thread.Sleep(milliseconds);
    Console.WriteLine("* {0} work one", name);
    return 1;
});

View more solutions

Comments

[Ace Caserya]

Is Run a .NET 4.5 feature?

[McGarnagle]

@Henryyottabyte yes, apparently: msdn.microsoft.com/en-us/library/…

[Ace Caserya]

adding to the answer is this link i found. blogs.msdn.com/b/pfxteam/archive/2011/10/24/10229468.aspx

[Miroslav Nedyalkov]

It looks like Task::Factory->StartNew in C++/CLI

[usr]

It's important to know that this code does not behave identically to Task.Run.