C# 10: guide with ConcurrentDictionary implementation guide Values as Expected in Multi-threaded Environment
I'm working through a tutorial and I've looked through the documentation and I'm still confused about I'm working with a question with `ConcurrentDictionary<TKey, TValue>` in C# 10 when multiple threads are trying to update the same key simultaneously. I expect it to handle concurrent writes gracefully, but I'm seeing stale values being returned. Here’s a simplified example of what I’m doing: ```csharp using System; using System.Collections.Concurrent; using System.Threading; using System.Threading.Tasks; class Program { static ConcurrentDictionary<int, int> dict = new ConcurrentDictionary<int, int>(); static void Main() { // Initialize the dictionary with a key. dict[1] = 0; // Start multiple tasks to increment the value. Parallel.For(0, 100, _ => { dict.AddOrUpdate(1, 1, (key, oldValue) => oldValue + 1); }); // Wait a moment for all tasks to complete. Thread.Sleep(1000); // Print the result. Console.WriteLine($"Final value for key 1: {dict[1]}"); } } ``` I expect the final output to be 100 since I am incrementing the value 100 times, but I often see values like 75 or 80. The tasks seem to be conflicting, leading to lost updates. I’ve tried various approaches, including using `AddOrUpdate` and `GetOrAdd`, but the scenario continues. I also logged the values being set inside the lambda function to see if there’s any pattern, but the logs show increments happening as expected. Is there something I’m missing here regarding how `ConcurrentDictionary` works in high-concurrency scenarios? Any suggestions for ensuring that all increments are counted correctly would be greatly appreciated. Any help would be greatly appreciated! I'm coming from a different tech stack and learning C#. Thanks for your help in advance!