我正在使用WMI查询设备。当新设备插入或移除时,我需要更新UI(以保持设备列表最新状态)。
private void LoadDevices()
{
using (ManagementClass devices = new ManagementClass("Win32_Diskdrive"))
{
foreach (ManagementObject mgmtObject in devices.GetInstances())
{
foreach (ManagementObject partitionObject in mgmtObject.GetRelated("Win32_DiskPartition"))
{
foreach (ManagementBaseObject diskObject in partitionObject.GetRelated("Win32_LogicalDisk"))
{
trvDevices.Nodes.Add( ... );
}
}
}
}
}
protected override void WndProc(ref Message m)
{
const int WM_DEVICECHANGE = 0x0219;
const int DBT_DEVICEARRIVAL = 0x8000;
const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
switch (m.Msg)
{
// Handle device change events sent to the window
case WM_DEVICECHANGE:
// Check whether this is device insertion or removal event
if (
(int)m.WParam == DBT_DEVICEARRIVAL ||
(int)m.WParam == DBT_DEVICEREMOVECOMPLETE)
{
LoadDevices();
}
break;
}
// Call base window message handler
base.WndProc(ref m);
}
这段代码抛出了以下异常
应用程序调用了一个为不同线程编写的接口。
我放置了
MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString());
在 LoadDevices 方法的开头,我发现它总是从同一个线程(1)调用。你能解释一下这里发生了什么,并且如何解决这个错误吗?