无法在 C# 应用程序中检测到硬盘驱动器

Question

我写了一个 api 来将所有外部存储驱动器连接到我的计算机。但是我无法检测到硬盘驱动器。

private async Task GetAllDrivesConnected()
        {
                await Task.Run(() =>
                {
                    var drives = DriveInfo.GetDrives();
                    lock (this.myUsbDriveListLock)
                    {
                        foreach (var aDrive in drives .Where(theDrive => theDrive.DriveType == DriveType.Removable && theDrive.IsReady))
                        {
                            DriveLetter_Array.Add(aDrive.Name);
                        }
                    }

                    string LatestPath = DriveLetter_Array.LastOrDefault();
                    this.SetCurrentUsbPath(LatestPath);
                    var DeviceMessageEventArgs = new DeviceMessageEventArgs { Drive = LatestPath, UsbAdded = true };
                    FireEventAddPathRemovePath(DeviceMessageEventArgs);
                });
            
        }

我正在使用 WML 查询来监听设备插入事件：

 private async Task DeviceNotification()
        {
            await Task.Run(() =>
            {
                var InsertQuery = new WqlEventQuery("SELECT * FROM Win32_VolumeChangeEvent WHERE EventType = 2");
                myInsertionWatcher = new ManagementEventWatcher(InsertQuery);
                myInsertionWatcher.EventArrived += this.DeviceInsertedEvent;
                myInsertionWatcher.Start();

                var RemoveQuery = new WqlEventQuery("SELECT * FROM Win32_VolumeChangeEvent WHERE EventType = 3");
                myRemovalWatcher = new ManagementEventWatcher(RemoveQuery);
                myRemovalWatcher.EventArrived += this.DeviceRemovedEvent;
                myRemovalWatcher.Start();
            });
        }

Answer 1

请尝试在启动后添加等待下一个事件的方法

myInsertionWatcher.WaitForNextEvent();

Answer 2

如果您真的检查了其他 DriveType，您的评论并不清楚。如果我运行在连接外部硬盘驱动器后我得到以下图像的输出：

DriveInfo.GetDrives().Where(d => d.IsReady)

如您所见，它有 DriveType Fixed，即使它是通过 USB 端口连接的。

您可能想要更改 foreach 循环：

foreach (var aDrive in drives .Where(theDrive => theDrive.IsReady))
{
    DriveLetter_Array.Add(aDrive.Name);
}

如果您只想查看外部硬盘驱动器，则可能需要查看 this answer

无法在 C# 应用程序中检测到硬盘驱动器

Not able to detect Hard disk drive in C# application

c#

usb