记 QEMU 虚拟磁盘设备移动文件抛异常但实际移动成功

Get-WmiObject Win32_DiskDrive
Partitions : 1
DeviceID   : \\.\PHYSICALDRIVE1
Model      : QEMU QEMU HARDDISK SCSI Disk Device
Size       : 105226007040
Caption    : QEMU QEMU HARDDISK SCSI Disk DevicePartitions : 2
DeviceID   : \\.\PHYSICALDRIVE0
Model      : QEMU QEMU HARDDISK SCSI Disk Device
Size       : 118106795520
Caption    : QEMU QEMU HARDDISK SCSI Disk DevicePartitions : 1
DeviceID   : \\.\PHYSICALDRIVE2
Model      : QEMU QEMU HARDDISK SCSI Disk Device
Size       : 118106795520
Caption    : QEMU QEMU HARDDISK SCSI Disk DeviceCopy

var workFolder = Path.Join(Path.GetTempPath(), "Test-RecedajeeKewhinuhoyay");
Directory.CreateDirectory(workFolder);

Console.WriteLine($"测试文件夹 {workFolder}");

var locker = new object();

var taskList = new List<Task>();

for (int i = 0; i < 50; i++)
{
    var task = Task.Run(async () =>
    {
        var fileName = Path.GetRandomFileName();
        var filePath = Path.Join(workFolder, fileName + ".tmp");

        await MockDownloadAsync(filePath);

        var newFilePath = Path.Join(workFolder, fileName);
        try
        {
            File.Move(filePath, newFilePath);
        }
        catch (Exception e)
        {
            /*
            Move file fail. FilePath=C:\Users\admin\AppData\Local\Temp\Test-RecedajeeKewhinuhoyay\zvxau5gx.lmz.tmp. HResult=80070003;System.IO.DirectoryNotFoundException: Could not find a part of the path.
               at System.IO.FileSystem.MoveFile(String, String, Boolean)
               at System.IO.File.Move(String, String, Boolean)
               at System.IO.File.Move(String, String)
               at Program.<>c__DisplayClass0_0.<<<Main>$>b__2>d.MoveNext()
             */

            // 新文件存在: True;原文件存在： False

            if (e is IOException ioException)
            {
                Output($"Move file fail. FilePath={filePath}. HResult={ioException.HResult:X};\r\n新文件存在: {File.Exists(newFilePath)};原文件存在： {File.Exists(filePath)}\r\n{ioException}");
            }
            else
            {
                Output($"Move file fail. FilePath={filePath}.\r\n新文件存在: {File.Exists(newFilePath)};原文件存在： {File.Exists(filePath)}\r\n{e}");
            }
        }
    });

    taskList.Add(task);
}

void Output(string message)
{
    Console.WriteLine(message);
}

async Task MockDownloadAsync(string filePath)
{
    using var fileStream = File.OpenWrite(filePath);
    var buffer = new byte[10240];
    for (int i = 0; i < 100; i++)
    {
        Random.Shared.NextBytes(buffer);
        fileStream.Write(buffer, 0, buffer.Length);

        await Task.Delay(15);
    }
}

Task.WaitAll(taskList);

Console.WriteLine("运行完成");Copy

System.IO.DirectoryNotFoundException: Could not find a part of the path.

               at System.IO.FileSystem.MoveFile(String, String, Boolean)
               at System.IO.File.Move(String, String, Boolean)
               at System.IO.File.Move(String, String)
               at Program.<>c__DisplayClass0_0.<<<Main>$>b__2>d.MoveNext()Copy

        try
        {
            File.Move(filePath, newFilePath);
        }
        catch(Exception e)
        {
            if (e is System.IO.DirectoryNotFoundException && (uint)e.HResult == 0x80070003/*这个 0x80070003 是多余的判断，只是为了说明就是这种情况而已*/)
            {
                // 有可能是在 QEMU 虚拟磁盘上，在虚拟硬盘移动文件成功，但 Win32 返回失败
                // 尝试判断移动之后的文件是否存在，如果存在就认为移动成功
                if (File.Exists(downloadEntry.FilePath))
                {
                    // 移动成功了，返回就可以了，不用再处理了
                    return; // 业务代码里面不一定可以用 return 哦，调用了 return 将会结束方法了哦
                }
                else
                {
                    // 没有移动成功，即文件不存在，则继续的其他处理
                }
            }

            // ...
            // 忽略其他处理。其他处理如记录日志呀或尝试换成拷贝等

            throw;
        }Copy

git init
git remote add origin https://gitee.com/lindexi/lindexi_gd.git
git pull origin a3b5ce1d8dcc08cdc2d23e436e6fb477f1fac503Copy

git remote remove origin
git remote add origin https://github.com/lindexi/lindexi_gd.git
git pull origin a3b5ce1d8dcc08cdc2d23e436e6fb477f1fac503Copy