c# - "System.IO.IOException: The process cannot access the file ' C :\Test\test. 文本 ' because it is being used by another process"

Question

C# 的新手。尝试迭代写入 .txt 文件，我尝试使用它来实现解决方案:

Create a .txt file if doesn't exist, and if it does append a new line

我是这样写的:

  var path = @"C:\Test\test.txt";

  try
  {
    if (!File.Exists(path))
    {
      File.Create(path);
      TextWriter tw = new StreamWriter(path);
      tw.WriteLine(message);
      tw.Close();
    }
    else if (File.Exists(path))
    {
      using (var tw = new StreamWriter(path, true))
      {
        tw.WriteLine(message);
        tw.Close();
      }
    }
  }
  catch (Exception e)
  {
    Console.WriteLine(e);
    throw;
  }
}

无论文件是否存在，都会产生同样的错误:

"System.IO.IOException: The process cannot access the file 'C:\Test\test.txt' because it is being used by another process"

这次我做错了什么？

Answer 1

File.Create(path); 打开文件并使其保持打开状态。当您执行 TextWriter tw = new StreamWriter(path); 时，您正在尝试访问创建文件的进程正在使用的文件(上面的代码行)。

你应该这样做:

if (!File.Exists(path))
{
    using (var stream = File.Create(path))
    {
        using (TextWriter tw = new StreamWriter(stream))
        {
            tw.WriteLine("abc");
        }
    }
}