How to Limit Concurrent Tasks in C#?

Restricting Concurrent Tasks in C#

In multithreaded and asynchronous programming, controlling the number of parallel tasks can enhance performance and maintain stability. This question explores how to limit the maximum number of concurrent tasks in C#.

Limiting Concurrency

The code block provided exemplifies the creation of a new task for each input message. This approach can lead to excessive resource utilization if the message count is large. To limit concurrency, consider utilizing Parallel.ForEach with MaxDegreeOfParallelism.

Parallel.ForEach(messages, new ParallelOptions { MaxDegreeOfParallelism = 10},
msg =>
{
     // logic
     Process(msg);
});

By specifying MaxDegreeOfParallelism as 10, up to 10 messages will be processed simultaneously, reducing resource strain.

Maintaining Sequence

However, this approach does not guarantee message processing in the same sequence as the original collection. To ensure order, use SequentialQuery from the Parallel LINQ library:

var processedMessages = messages.AsParallel()
    .AsOrdered()  // Preserves order
    .Select(msg => Process(msg))
    .ToList(); // Forces execution

This ensures that messages are processed in the same order as the input collection, while still leveraging parallelism for efficiency.

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