多线程锁读/写文本c#

Question

经过大量的研究,在阅读并尝试了所有问题后,我认为是时候向我寻求帮助了.

我在C#中有一个应用程序,我正在尝试使用不同的线程在SAME文件中编写.

public static void LaunchThreads(string path_file)
{
    int i = 0;
    Dictionary<int, Thread> threadsdico = new Dictionary<int, Thread>();
    while (i < MAX_THREAD)
    {
            Thread thread = new Thread(() => ThreadEntryWriter(string path_file));
            thread.Name = string.Format("ThreadsWriters{0}", i);
            threadsdico.Add(i, thread);
            thread.Start();
            i++;
    }
    int zz = 0;
    while (zz < threadsdico.Count())
    {
        threadsdico[zz].Join();
        zz++;
    }
}
private static readonly Object obj = new Object();
public static void ThreadEntryWriter(string path_file)
{
    int w = 0;
    while (w < 99)
    {       
        string newline = w + " - test" + "\r";
        lock(obj)
        {
            string txt = File.ReadAllText(path_file);
            using (TextWriter myWriter = new StreamWriter(path_file))
            {   
                TextWriter.Synchronized(myWriter).Write(txt + newline);
            }
        }
        w++;
    }
}

我已经尝试了所有的东西,我的代码是全局的,但是我已经尝试了各种方法,每个锁,每个文件打开方法,但我一直在努力The process cannot access the files because it's in use.生成此错误的行就是这一行using (TextWriter myWriter = new StreamWriter(path_file)).

我尝试了很多东西,关闭文件等,但是当线程开始同时工作时,程序停止并给我错误The process cannot access the files because it's in use(自我解释).但我不明白为什么,锁定是为了阻止另一个线程进入这里.我使用Synchronized方法编写线程安全的.很抱歉长篇大论是我在这里的第一篇文章.

Answer 1

同步写入器仍然应该被处理：

var newline = w + " - test";
using (var sw = new StreamWriter(path_file))
using (var sync = TextWriter.Synchronized(sw))
{
    // no need to add a new line char, just use other method to write
    sync.WriteLine(txt + newline);
}

另外，您可以保存一个sync变量并从所有线程调用它的方法，它会为您完成所有工作，并且您可以在编写完所有文本后处理它。