How Can I Run Many Tasks Sequentially with a Limited Number of Concurrent Tasks in .NET?

Running a Set of Tasks Sequentially with Task Limits

Suppose you have a scenario where you need to execute a large number of tasks (e.g., 100), but you want to restrict the number of tasks running concurrently (e.g., 10). This problem can be efficiently addressed using the 'Task' class introduced in .NET Framework 4.0.

In the given scenario, we can utilize the 'SemaphoreSlim' class to control the maximum number of tasks running simultaneously. 'SemaphoreSlim' allows you to create a semaphore object that can limit the number of concurrent operations.

Here's a sample implementation that demonstrates how to achieve your desired behaviour:

using System.Threading.Tasks;
using System.Threading;

class Program
{
    static void Main()
    {
        // Create a SemaphoreSlim object to limit the number of concurrent tasks to 10
        SemaphoreSlim maxThread = new SemaphoreSlim(10);

        // Create 115 tasks with each task performing a specific action
        for (int i = 0; i < 115; i++)
        {
            // Acquire a permit from the SemaphoreSlim object, blocking if the limit is reached
            maxThread.Wait();

            // Schedule a new task
            Task.Factory.StartNew(() =>
            {
                // Perform your desired task here
            }, TaskCreationOptions.LongRunning)
            // Once the task is complete, release the permit back to the SemaphoreSlim object
            .ContinueWith((task) => maxThread.Release());
        }
    }
}

In this implementation, each task acquires a permit from the 'SemaphoreSlim' object before it can execute. If the maximum number of permits (10 in this case) have been acquired, the semaphore blocks subsequent tasks from acquiring permits until a permit is released.

By using this approach, you can execute a set of tasks sequentially, ensuring that only a predefined number of tasks run concurrently. Once all the tasks are completed, the 'Main' method exits, indicating the end of the program.

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