c# - 无法访问文件，因为它正在被另一个程序使用

Question

我试图删除行尾的空格，然后该行将写入另一个文件。

但是当程序到达 FileWriter 时，它会给我以下错误

Process can't be accessed because it is being used by another process.

代码如下。

private void FrmCounter_Load(object sender, EventArgs e)
{
        string[] filePaths = Directory.GetFiles(@"D:\abc", "*.txt", SearchOption.AllDirectories);
        string activeDir = @"D:\dest";
        System.IO.StreamWriter fw;
        string result;

        foreach (string file in filePaths)
        {
            result = Path.GetFileName(file);
            System.IO.StreamReader f = new StreamReader(file);
            string newFileName = result;
            // Combine the new file name with the path
            string newPath = System.IO.Path.Combine(activeDir, newFileName);
            File.Create(newPath);

            fw = new StreamWriter(newPath);

            int counter = 0;
            int spaceAtEnd = 0;
            string line;

            // Read the file and display it line by line.
            while ((line = f.ReadLine()) != null)
            {
                if (line.EndsWith(" "))
                {
                    spaceAtEnd++;
                    line = line.Substring(0, line.Length - 1);
                }
                fw.WriteLine(line);
                fw.Flush(); 
                counter++;
            }

            MessageBox.Show("File Name : " + result);
            MessageBox.Show("Total Space at end : " + spaceAtEnd.ToString());
            f.Close();
            fw.Close();
        }
}

Answer 1

File.Create 本身返回一个流。

使用该流写入文件。您收到此错误的原因是 File.Create 返回的 Stream 已打开，您正在尝试再次打开该文件进行写入。

要么关闭 File.Create 返回的流，要么最好将该流用于文件写入或使用

Stream newFile = File.Create(newPath);
fw = new StreamWriter(newFile);