standards-c-sharp

Prefer to start tasks with Task.Run

Prefer Task.Run over Task.Factory.StartNew over new Task().

When to use Task.Factory.StartNew

• Task.Factory.StartNew is considered dangerous and should only be used in very specific circumstances.
• The most common use-case is to specify TaskCreationOptions.LongRunning. In the current implementation of .NET this creates a new thread for your task, instead of running it on the threadpool. This could change between implementations / platforms, so should not be relied upon. Only do this if you have profiled your application and found it to be necessary. If you really need a new thread, consider Thread.Start.

Don’t

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

Do

Task.Run(() => MyMethod()); // equivalent to the above

When to use new Task()

• Only construct the task and .Start() it manually if you need to separate the task’s creation from its execution, such as when you conditionally execute tasks that you’ve created.

Don’t

var task = new Task(MyMethod, CancellationToken.None, TaskCreationOptions.DenyChildAttach);
task.Start(TaskScheduler.Default);

Do

Task.Run(() => MyMethod()); // equivalent to the above

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