How can I check if a Queue is empty?

c# queue is-empty
MoShe picture MoShe · Nov 1, 2011 · Viewed 69.5k times · Source

In C#, how can I check if a Queue is empty?

I want to iterate through the Queue's elements, and I need to know when to stop. How can I accomplish this?

Answer

Jon Skeet picture Jon Skeet · Nov 1, 2011

Assuming you mean Queue<T> you could just use:

if (queue.Count != 0)

But why bother? Just iterate over it anyway, and if it's empty you'll never get into the body:

Queue<string> queue = new Queue<string>();

// It's fine to use foreach...
foreach (string x in queue)
{
    // We just won't get in here...
}

Related questions

Creating a blocking Queue<T> in .NET?

I have a scenario where I have multiple threads adding to a queue and multiple threads reading from the same queue. If the queue reaches a specific size all threads that are filling the queue will be blocked on add …

Read More
Fixed size queue which automatically dequeues old values upon new enques

I'm using ConcurrentQueue for a shared data structure which purpose is holding the last N objects passed to it (kind of history). Assume we have a browser and we want to have the last 100 browsed Urls. I want a queue …

Read More
In C# would it be better to use Queue.Synchronized or lock() for thread safety?

I have a Queue object that I need to ensure is thread-safe. Would it be better to use a lock object like this: lock(myLockObject) { //do stuff with the queue } Or is it recommended to use Queue.Synchronized like this: …

Read More