public virtual bool?ShowDialog()
{
this.CheckPermissionsToShowDialog();
if (!Environment.UserInteractive)
{
throw new InvalidOperationException(SR.Get("CantShowModalOnNonInteractive"));
}
IntPtr intPtr = UnsafeNativeMethods.GetActiveWindow();
if (intPtr == IntPtr.Zero && Application.Current != null)
{
intPtr = Application.Current.ParkingHwnd;
}
HwndWrapper hwndWrapper = null;
bool? result;
try
{
if (intPtr == IntPtr.Zero)
{
hwndWrapper = new HwndWrapper(0, 0, 0, 0, 0, 0, 0, "", IntPtr.Zero, null);
intPtr = hwndWrapper.Handle;
}
this._hwndOwnerWindow = intPtr;
try
{
ComponentDispatcher.CriticalPushModal();
result = new bool?(this.RunDialog(intPtr));
}
finally
{
ComponentDispatcher.CriticalPopModal();
}
}
finally
{
if (hwndWrapper != null)
{
hwndWrapper.Dispose();
}
}
return(result);
}
public virtual Nullable <bool> ShowDialog()
{
CheckPermissionsToShowDialog();
// Don't allow file dialogs to be shown if not in interactive mode
// (for example, if we're running as a service)
if (!Environment.UserInteractive)
{
throw new InvalidOperationException(SR.Get(SRID.CantShowModalOnNonInteractive));
}
// Call GetActiveWindow to retrieve the window handle to the active window
// attached to the calling thread's message queue. We'll set the owner of
// the common dialog to this handle.
IntPtr hwndOwner = UnsafeNativeMethods.GetActiveWindow();
if (hwndOwner == IntPtr.Zero)
{
// No active window, so we'll use the parking window as the owner,
// if its available.
if (Application.Current != null)
{
hwndOwner = Application.Current.ParkingHwnd;
}
}
HwndWrapper tempParentHwnd = null;
try
{
// No active window and application wasn't available or didn't have
// a ParkingHwnd, we create a hidden parent window for the dialog to
// prevent breaking UIAutomation.
if (hwndOwner == IntPtr.Zero)
{
tempParentHwnd = new HwndWrapper(0, 0, 0, 0, 0, 0, 0, "", IntPtr.Zero, null);
hwndOwner = tempParentHwnd.Handle;
}
// Store the handle of the owner window inside our class so we can use it
// to center the dialog later.
_hwndOwnerWindow = hwndOwner;
// Signal that this thread is going to go modal.
try
{
ComponentDispatcher.CriticalPushModal();
return(RunDialog(hwndOwner));
}
finally
{
ComponentDispatcher.CriticalPopModal();
}
}
finally
{
if (tempParentHwnd != null)
{
tempParentHwnd.Dispose();
}
}
}