File Concurrency Example

class Program
    {
        static string OutputPath = @"C:\Users\baile\Downloads\Data";

        static HttpClient Web = new HttpClient();
        static async Task Main(string[] args)
        {
            var Codes = new List<int>();
            for (int i = 0; i < 200; i++)
            {
                Codes.Add(i + 1);
            }
            Web.BaseAddress = new Uri("https://jsonplaceholder.typicode.com/");
            var taskList = new List<Task>();
            Directory.CreateDirectory(OutputPath);
            foreach (int rCode in Codes)
            {
                taskList.Add(Task.Run(async () =>
                {
                    try
                    {
                        var _path = Path.Combine(OutputPath, $"{rCode}-{DateTime.Now.ToString("yyyy-MM-ddHHmmssfff")}.json");
                        using (Stream dataStream = await Web.GetStreamAsync($"todos/{rCode}"))
                        using (FileStream localStream = new FileStream(_path, FileMode.Create, FileAccess.ReadWrite, FileShare.Read))
                        {
                            await dataStream.CopyToAsync(localStream);
                        }
                    }
                    catch (Exception er)
                    {

                    }
                }));
            }
            
            //https://www.reddit.com/r/csharp/comments/ej1hpl/writing_to_files_inside_of_a_task_which_is/
            Console.WriteLine("Starting Reddit File Concurrency Tests");

            await Task.WhenAll(taskList.ToArray());
            Console.WriteLine("Test Completed, press any key to exit");
            Console.ReadKey();
        }
    }