How to convert concurrentbag to list?

I have few task which I can do in parallel. As list is not thread safe i am using concurrentbag. Once all the task are completed I want to convert the concurrentbag to list.

I have searched in MSDN but couldn't find any API which can convert concurrentbag to list in c#. How can I do it?

Note: i have to convert to list, It is necessary.

I have other option to apply lock on list but i wanted to use in build concurrentbag which is thread safe.

5 Answers

You could use ToList extension method.

var list = concurrentBag.ToList(); 

ConcurrentBag has the extension method of .ToList() - it implementsIEnumerable<T>

var someList = someConcurrentBag.ToList(); 

ConcurrentBag has the ToList() method.

If your internal item are non list then use

var someList = someConcurrentBag.ToList(); 

Or you can try as below If each item in the cbag is already a list.

E.g. In my case ConcurrentBag<List<int>>

ConcurrentBag<List<string>> jobErrorsColl = new ConcurrentBag<List<string>>(); // Got something in jobErrorsColl List<string> multipleJobErrors = new List<string>(); List<string> singleJobErrors = new List<string>(); while (jobErrorsColl.IsEmpty) { jobErrorsColl.TryPeek(out singleJobErrors); multipleJobErrors.AddRange(singleJobErrors); } return multipleJobErrors; 

MSDN link is here for the same

You can use the following to convert concurrentbag to list:

var list = = someConcurrentBag.SelectMany(r => r).ToList();