Bonjour,
ca ne va pas changer grand chose mais voici une information supplémentaire. La méthode levant la COM Exception est la suivante:
// Returns objects useful for talking to the underlying HWND.
// Throws TS_E_NOLAYOUT if they are not available.
/// <securitynote>
/// Critical: This code calls into PresentationSource.FromVisual to retrieve Source
/// The source is also handed out to the callers
/// </securitynote>
[SecurityCritical]
private void GetVisualInfo(out PresentationSource source, out IWin32Window win32Window, out ITextView view)
{
source = PresentationSource.CriticalFromVisual(RenderScope);
win32Window = source as IWin32Window;
if (win32Window == null)
{
throw new COMException(SR.Get(SRID.TextStore_TS_E_NOLAYOUT), UnsafeNativeMethods.TS_E_NOLAYOUT);
}
view = this.TextView;
}
Les exceptions COM arrivent dans la majorité des cas quand des ressources ne sont pas / mal libérées. Dans ta situation, la source n'est pas correctement retrouvée. En continuant un peu dans la méthode PresentationSource.CriticalFromVisual:
/// <securitynote>
/// Critical - uses RootSourceProperty. and returns the PresentationSource
/// </securitynote>
/// <param name="v">The dependency object to find the source for
/// <param name="enable2DTo3DTransition">
/// Determines whether when walking the tree to enable transitioning from a 2D child
/// to a 3D parent or to stop once a 3D parent is encountered.
///
[FriendAccessAllowed] // To allow internal code paths to access this function
[SecurityCritical]
internal static PresentationSource CriticalFromVisual(DependencyObject v, bool enable2DTo3DTransition)
{
if (v == null)
{
throw new ArgumentNullException("v");
}
PresentationSource source = FindSource(v, enable2DTo3DTransition);
// Don't hand out a disposed source.
if (null != source && source.IsDisposed)
{
source = null;
}
return source;
}
Et encore un peu plus loin: (dans la logique et pour ne pas provoquer l'erreur, la méthode suivante doit soit retourner un NULL, soit retourner une instance non libérée).
///<securitynote>
/// Critical - uses RootSourceProperty and returns the PresentationSource
///</securitynote>
/// <param name="o">The dependency object to find the source for
/// <param name="enable2DTo3DTransition">
/// Determines whether when walking the tree to enable transitioning from a 2D child
/// to a 3D parent or to stop once a 3D parent is encountered.
///
[SecurityCritical]
private static PresentationSource FindSource(DependencyObject o, bool enable2DTo3DTransition)
{
PresentationSource source = null;
// For "Visual" nodes GetRootVisual() climbs to the top of the
// visual tree (parent==null)
// For "ContentElements" it climbs the logical parent until it
// reaches a visual then climbs to the top of the visual tree.
DependencyObject v = InputElement.GetRootVisual(o, enable2DTo3DTransition);
if (v != null)
{
source = CriticalGetPresentationSourceFromElement(v, RootSourceProperty);
}
return source;
}
Bref, à mon avis, tu dois avoir une TextBox qui est "disposée" ou qui n'a plus de rendu visuel ce qui provoque l'exception.
Essaye peut-être de t'abonner à "DispatcherUnhandledException".
