private static IDataObject GetDataObjectInternal()
{
IDataObject dataObject;
IComDataObject oleDataObject;
// Retry OLE operations several times as mitigation for clipboard locking issues in TS sessions.
// See Dev10 bug 616223 and VSWhidbey bug 476911.
int i = OleRetryCount;
while (true)
{
oleDataObject = null;
int hr = OleServicesContext.CurrentOleServicesContext.OleGetClipboard(ref oleDataObject);
if (NativeMethods.Succeeded(hr))
{
break;
}
if (--i == 0)
{
Marshal.ThrowExceptionForHR(hr);
}
Thread.Sleep(OleRetryDelay);
}
if (oleDataObject is IDataObject)
{
dataObject = (IDataObject)oleDataObject;
}
else if (oleDataObject != null)
{
dataObject = new DataObject(oleDataObject);
}
else
{
dataObject = null;
}
// We make this check outside of the loop independant of whether the data is ole data object or IDataObject
// Although one is unable to create an OleDataObject in partial trust we still need to ensure that if he did
// we strip the formats we care about by wrapping in ConstrainedDataObject
if (dataObject != null)
{
// this is the case we are concerend about where content comes from partial trust into full trust
// in the case where data contained is in one of the two formats: XAML or ApplicationTrust we return a wrapper
// that blocks access to these
if (IsDataObjectFromLessPriviligedApplicationDomain(dataObject) &&
(dataObject.GetDataPresent(DataFormats.Xaml, /*autoConvert:*/ false) ||
dataObject.GetDataPresent(DataFormats.ApplicationTrust, /*autoConvert:*/ false)))
{
// in this case we set the data object to be a wrapper data object that blocks off
// xaml or application trust formats if they exist
dataObject = new ConstrainedDataObject(dataObject);
}
}
return(dataObject);
}
private static IDataObject GetDataObjectInternal()
{
IDataObject dataObject;
IComDataObject oleDataObject;
// Retry OLE operations several times as mitigation for clipboard locking issues in TS sessions.
int i = OleRetryCount;
while (true)
{
oleDataObject = null;
int hr = OleServicesContext.CurrentOleServicesContext.OleGetClipboard(ref oleDataObject);
if (NativeMethods.Succeeded(hr))
{
break;
}
if (--i == 0)
{
Marshal.ThrowExceptionForHR(hr);
}
Thread.Sleep(OleRetryDelay);
}
if (oleDataObject is IDataObject && !Marshal.IsComObject(oleDataObject))
{
dataObject = (IDataObject)oleDataObject;
}
else if (oleDataObject != null)
{
// Wrap any COM objects or objects that don't implement <see cref="T:System.Windows.IDataObject"/>.
// In the case of COM objects, this protects us from a <see cref="T:System.InvalidOperationException"/> from the marshaler
// when calling <see cref="M:System.Windows.IDataObject.GetData(T:System.Type)"/> due to <see cref="T:System.Type"/>
// not being marked with the <see cref="T:System.Runtime.InteropServices.COMVisibleAttribute"/>.
dataObject = new DataObject(oleDataObject);
}
else
{
dataObject = null;
}
// We make this check outside of the loop independant of whether the data is ole data object or IDataObject
// Although one is unable to create an OleDataObject in partial trust we still need to ensure that if he did
// we strip the formats we care about by wrapping in ConstrainedDataObject
if (dataObject != null)
{
// this is the case we are concerend about where content comes from partial trust into full trust
// in the case where data contained is in one of the two formats: XAML or ApplicationTrust we return a wrapper
// that blocks access to these
if (IsDataObjectFromLessPriviligedApplicationDomain(dataObject) &&
(dataObject.GetDataPresent(DataFormats.Xaml, /*autoConvert:*/ false) ||
dataObject.GetDataPresent(DataFormats.ApplicationTrust, /*autoConvert:*/ false)))
{
// in this case we set the data object to be a wrapper data object that blocks off
// xaml or application trust formats if they exist
dataObject = new ConstrainedDataObject(dataObject);
}
}
return(dataObject);
}
