using System.Text;
 
public class Program
{
    static int SuccessCount = 0;
    static int FailureCount = 0;
    static ReaderWriterLockSlim WriteLock = new ReaderWriterLockSlim();
    static object Lock = new object();
 
    static void Main(string[] args)
    {
 
        Console.WriteLine("Hello, World!");
 
        var result = Parallel.For(0, 30, action =>
        {
            WriteTest();
        });
 
        Console.WriteLine("寫(xiě)入中...");
        Console.ReadLine();
    }
 
    static void WriteTest()
    {
        try
        {
            WriteLock.EnterWriteLock();
            //lock (Lock)
            //{
                using (FileStream logFile = new FileStream("test.txt", FileMode.OpenOrCreate, FileAccess.Write, FileShare.Write))
                {
                    SuccessCount++;
                    Console.WriteLine("count:" + SuccessCount);
                    var count = SuccessCount;
                    var logContentBytes = Encoding.Default.GetBytes($"{Thread.CurrentThread.ManagedThreadId}, {DateTime.Now.ToString("yyyy-MM-dd:HH:mm:ss:ffff")},{count},{Environment.NewLine}");
                    logFile.Seek(0, SeekOrigin.End);
                    logFile.Write(logContentBytes, 0, logContentBytes.Length);
                }
            //}
        }
        catch (Exception ex)
        {
            FailureCount++;
            Console.WriteLine($"Failure Count:{FailureCount}");
        }
        finally { WriteLock.ExitWriteLock(); }
    }
 
}