CODEWITHSUNDEEP
c#.netparallel-processing
Itay.B
Itay.B

Reputation: 4111

.Net parallel WaitAll()

I have a situation in my code where i'm starting unknown number of tasks and would like to use Task.WaitAll().

something like this:

if (condition) 
{ 
    var task1 = Task.Factory.StartNew (call the web service1...);
} 

if (condition) 
{ 
    var task2 = Task.Factory.StartNew (call the web service2...);
}

if (condition) 
{ 
    var task3 = Task.Factory.StartNew (call the web service3...); 
}

Task.WaitAll(task1, task2, task3);

The problem is that i can't say 

Task.WaitAll(task1, task2 , task3)

because i don't know which one of them will actually start. Any idea for a solution?

Upvotes: 3

Views: 1050

Answers (4)

cuongle
cuongle

Reputation: 75306

You can use the list of Tasks and add your tasks into list dynamically:

var tasks = new List<Task>();

if (condition) 
{ 
    var task = Task.Factory.StartNew (call the web service1...);
    tasks.Add(task);
} 

if (condition) 
{ 
    var task2 = Task.Factory.StartNew (call the web service2...);
     tasks.Add(task2);
}

if (condition) { 
    var task3 = Task.Factory.StartNew (call the web service3...); 
    tasks.Add(task3);
}

Task.WaitAll(tasks.ToArray());

Upvotes: 6

Sebastian Negraszus
Sebastian Negraszus

Reputation: 12215

Create a list of actually started tasks and do Task.WaitAll(taskList.ToArray())

if(condition)
{
    var task1 = Task.Factory.StartNew (call the web service1...);
    taskList.Add(task1);
}
// etc...

Upvotes: 3

Daniel Kelley
Daniel Kelley

Reputation: 7737

See How to: Wait on One or More Tasks to Complete. You can wait on an array of Tasks.

Upvotes: 0

platon
platon

Reputation: 5340

Generally, it is possible to save the list of tasks to the List (tasks) and use the following code:

    Task.WaitAll(tasks.ToArray());

Upvotes: 0

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