What is the yield keyword in C#?

What is the yield keyword in C#?

The yield keyword in C# is used to create an iterator. It allows you to return each element one at a time, instead of returning all elements at once.

Can you give me an example of how to use yield?

Sure! Here's a simple example:

public IEnumerable<int> GetNumbers()
{
    for (int i = 0; i < 5; i++)
    {
        yield return i;
    }
}

This method will return numbers from 0 to 4 one at a time.

What are the benefits of using yield?

Using yield can improve performance by generating values on-the-fly, reducing memory usage, and making your code cleaner and easier to read.

Are there any limitations to using yield?

Yes, you cannot use yield in methods that return void, and you cannot use it in async methods. Also, once an iterator is exhausted, it cannot be reused.