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VS2003 - VS2005 -> DisconnectedContext was detectedHi!
If I do the following in VS2003 it works - and in VS2005 it complains about a DisconnectedContext... using (ManagementClass mcDiskDrive = new ManagementClass(@"Win32_Diskdrive")) { // mcDiskDrive.GetInstances() is thowing the exception foreach (ManagementObject moDiskDrive in mcDiskDrive.GetInstances()) { } } Does anyone know what might go wrong? Thanks Ralf Hi!
If I switch off the MDA (Debug/Exceptions -> Managed Debugging Assistants) the Exception RPC_E_WRONG_THREAD shows up. OK - I understand the problem, but what can I do to resolve it? How can I marshall the objects into my thread space? Or do I have to do something different ...? Thanks in advance Ralf Show quote "Ralf" wrote: > Hi! > > If I do the following in VS2003 it works - and in VS2005 it complains about > a DisconnectedContext... > > using (ManagementClass mcDiskDrive = new ManagementClass(@"Win32_Diskdrive")) > { > // mcDiskDrive.GetInstances() is thowing the exception > foreach (ManagementObject moDiskDrive in mcDiskDrive.GetInstances()) > { > } > } > > Does anyone know what might go wrong? > > Thanks > Ralf Hi!
Sorry - my mistake was that I called this method from a message handler of WndProc ... So I got this cross thread problem. OK - I have to call Invoke, but now I get the exception: "This method is not implemented ..." - but it should be there, at least I can call it directly without problems. Here is a sample - perhaps someone can direct me to a solution? public class Form1 : Form { public Form1() { ShowDrive(); // 1: is working } protected override void WndProc(ref Message m) { if(m.Msg == WM_DEVICECHANGE) { ShowDrive(); // 2: not working -> ShowDriveInvoke(); } base.WndProc(ref m); } private void ShowDrive() { using (ManagementClass mc = new ManagementClass(@"Win32_Diskdrive")) { foreach (ManagementObject mo in mc.GetInstances()) // -> wrong thread, clear so far ... { ... } } } private void ShowDriveInvoke() { using (ManagementClass mc = new ManagementClass(@"Win32_Diskdrive")) { // throws Exception -> "This method is not implemented in any class" object[] args = {""}; foreach (ManagementObject mo in mc.InvokeMethod("GetInstances", args) as ManagementObjectCollection) { ... } } } } Thanks a lot Ralf Show quote "Ralf" wrote: > Hi! > > If I switch off the MDA (Debug/Exceptions -> Managed Debugging Assistants) > the Exception RPC_E_WRONG_THREAD shows up. > > OK - I understand the problem, but what can I do to resolve it? How can I > marshall the objects into my thread space? Or do I have to do something > different ...? > > Thanks in advance > Ralf > > "Ralf" wrote: > > > Hi! > > > > If I do the following in VS2003 it works - and in VS2005 it complains about > > a DisconnectedContext... > > > > using (ManagementClass mcDiskDrive = new ManagementClass(@"Win32_Diskdrive")) > > { > > // mcDiskDrive.GetInstances() is thowing the exception > > foreach (ManagementObject moDiskDrive in mcDiskDrive.GetInstances()) > > { > > } > > } > > > > Does anyone know what might go wrong? > > > > Thanks > > Ralf Hi!
OK - I must have been sleeping ... public class Form1 : Form { public delegate string DelegateGetDrives(); public Form1() { } internal const int WM_DEVICECHANGE = 0x0219; protected override void WndProc(ref Message m) { if(m.Msg == WM_DEVICECHANGE) { DelegateGetDrives gdi = new DelegateGetDrives(GetDrives); IAsyncResult result = gdi.BeginInvoke(null,""); ShowDrive((string)gdi.EndInvoke(result)); } base.WndProc(ref m); } private void GetDrives() { } ... } Sorry that I bothered you all with this question - but sometimes ... Cheers Ralf Show quote "Ralf" wrote: > Hi! > Sorry - my mistake was that I called this method from a message handler of > WndProc ... So I got this cross thread problem. > > OK - I have to call Invoke, but now I get the exception: "This method is not > implemented ..." - but it should be there, at least I can call it directly > without problems. > > Here is a sample - perhaps someone can direct me to a solution? > > public class Form1 : Form > { > public Form1() > { > ShowDrive(); // 1: is working > } > protected override void WndProc(ref Message m) > { > if(m.Msg == WM_DEVICECHANGE) > { > ShowDrive(); // 2: not working -> ShowDriveInvoke(); > } > base.WndProc(ref m); > } > private void ShowDrive() > { > using (ManagementClass mc = new ManagementClass(@"Win32_Diskdrive")) > { > foreach (ManagementObject mo in mc.GetInstances()) // -> wrong > thread, clear so far ... > { > ... > } > } > } > private void ShowDriveInvoke() > { > using (ManagementClass mc = new ManagementClass(@"Win32_Diskdrive")) > { > // throws Exception -> "This method is not implemented in any > class" > object[] args = {""}; > foreach (ManagementObject mo in mc.InvokeMethod("GetInstances", > args) as ManagementObjectCollection) > { > ... > } > } > } > } > > Thanks a lot > > Ralf > > > "Ralf" wrote: > > > Hi! > > > > If I switch off the MDA (Debug/Exceptions -> Managed Debugging Assistants) > > the Exception RPC_E_WRONG_THREAD shows up. > > > > OK - I understand the problem, but what can I do to resolve it? How can I > > marshall the objects into my thread space? Or do I have to do something > > different ...? > > > > Thanks in advance > > Ralf > > > > "Ralf" wrote: > > > > > Hi! > > > > > > If I do the following in VS2003 it works - and in VS2005 it complains about > > > a DisconnectedContext... > > > > > > using (ManagementClass mcDiskDrive = new ManagementClass(@"Win32_Diskdrive")) > > > { > > > // mcDiskDrive.GetInstances() is thowing the exception > > > foreach (ManagementObject moDiskDrive in mcDiskDrive.GetInstances()) > > > { > > > } > > > } > > > > > > Does anyone know what might go wrong? > > > > > > Thanks > > > Ralf  |
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