The Task Parallel Library is part of the .NET Framework since .NET 4. It is a set of APIs that simplifies the process of adding parallelism and concurrency to applications.
The Task Parallel Library (TPL) is a set of public types and APIs in the System.Threading and and the System.Threading.Tasks namespaces in the .NET Framework 4 and up. The purpose of the TPL is to make developers more productive by simplifying the process of adding parallelism and concurrency to applications. The TPL scales the degree of concurrency dynamically to most efficiently use all the processors that are available. In addition, the TPL handles the partitioning of the work, the scheduling of threads on the ThreadPool, cancellation support, state management, and other low-level details.
I would like to handle a collection in parallel, but I'm having trouble implementing it and I'm therefore hoping for some help.
The trouble arises if I want to call a method marked async in C#, within the lambda of the parallel loop. For…
I have an async method:
public async Task GenerateCodeAsync()
{
string code = await GenerateCodeService.GenerateCodeAsync();
return code;
}
I need to call this method from a synchronous method.
How can I do this without having to…
What is the difference between the below code snippets? Won't both be using threadpool threads?
For instance if I want to call a function for each item in a collection,
Parallel.ForEach(items, item => DoSomething(item));
vs
foreach(var item…
I don't quite understand the difference between Task.Wait and await.
I have something similar to the following functions in a ASP.NET WebAPI service:
public class TestController : ApiController
{
public static async Task Foo()
{
…
It works fine when have one or two tasks however throws an error "A task was cancelled" when we have more than one task listed.
List allTasks = new List();
allTasks.Add(....);
allTasks.Add(....);
Task.WaitAll(allTasks.ToArray(),…
AFAIK, all it knows is that at some point, its SetResult or SetException method is being called to complete the Task exposed through its Task property.
In other words, it acts as the producer for a Task and its completion.
I saw here the…
In C# and TPL (Task Parallel Library), the Task class represents an ongoing work that produces a value of type T.
I'd like to know what is the need for the Task.FromResult method ?
That is: In a scenario where you already have the produced value at…
What are the differences between using Parallel.ForEach or Task.Run() to start a set of tasks asynchronously?
Version 1:
List strings = new List { "s1", "s2", "s3" };
Parallel.ForEach(strings, s =>
{
DoSomething(s);
});
Version…
Certain System.Threading.Tasks.Task constructors take a CancellationToken as a parameter:
CancellationTokenSource source = new CancellationTokenSource();
Task t = new Task (/* method */, source.Token);
What baffles me about this is that there is no…
In a metro app, I need to execute a number of WCF calls. There are a significant number of calls to be made, so I need to do them in a parallel loop. The problem is that the parallel loop exits before the WCF calls are all complete.
How would you…
I was thrilled to see the new System.Collections.Concurrent namespace in .Net 4.0, quite nice! I've seen ConcurrentDictionary, ConcurrentQueue, ConcurrentStack, ConcurrentBag and BlockingCollection.
One thing that seems to be mysteriously missing…
I may be missing something but what is the difference between doing:
public void MyMethod()
{
Task t = Task.Factory.StartNew(DoSomethingThatTakesTime);
t.Wait();
UpdateLabelToSayItsComplete();
}
public async void MyMethod()
{
var result =…
The class CancellationTokenSource is disposable. A quick look in Reflector proves usage of KernelEvent, a (very likely) unmanaged resource.
Since CancellationTokenSource has no finalizer, if we do not dispose it, the GC won't do it.
On the other…
In the past few days I have tested the new features of .net 4.5 and c# 5.
I like its new async/await features. Earlier I had used BackgroundWorker to handle longer processes in the background with responsive UI.
My question is: after having these…
