[MStn CE U15.2 C#] Bug? To modify a cell content does not work...

Hi,

based on a recent question I thought what is a simple working code structure to iterate and modify a cell content.

This topic was discussed several times, but usually for C++ API. And when for NET, not many clear answers were provided. Because C++ and NET APIs are implemented differently a bit (which makes sense, C++ iterator and C# enumerator are different animals ;-), so not everything can be copied 1:1.

I wrote two snippets, one inspired by Yongan.Fu's answer in this discussion, the second one put together from more sources. But they do not work :-(

Test workflow is based on the attached DGN:

1. Identify an element from a cell (line string)
2. Obtain a parent element (cell element header)
3. Find a line that is in wrong level (level named "circles")
4. Change the element level to the right one ("lines")
5. Write the modification back to DGN file

Snippet 1:

Element parentElement = selected.ParentElement;
CellHeaderElement cellToBeModified = parentElement as CellHeaderElement;
CellHeaderElement originalCell = Element.GetFromElementRef(cellToBeModified.GetNativeElementRef()) as CellHeaderElement;

ChildElementEnumerator children = new ChildElementEnumerator(cellToBeModified);

while (children.MoveNext())
{
    if (children.Current is LineStringElement)
    {
        Element originalElement = Element.GetFromElementRef(children.Current.GetNativeElementRef());
        ElementPropertiesGetter getter = new ElementPropertiesGetter(children.Current);

        if (getter.Level == this.levelCircle.LevelId)
        {
            ElementPropertiesSetter setter = new ElementPropertiesSetter();
            setter.SetLevel(this.levelLines.LevelId);
            bool status = setter.Apply(children.Current); // true returned, instance changed

            // Bentley.DgnPlatformNET.DgnPlatformNETException: 'Bad StatusInt: 69645
            // children.Current.ReplaceInModel(original); 
        }
    }
}

// Test, whether modified cell was really modified ... not, it still contains original element
cellToBeModified.ExposeChildren(ExposeChildrenReason.Query);
bool exposeResult = cellToBeModified.ExposeChildren(ExposeChildrenReason.Query);
ChildElementCollection childrens = cellToBeModified.GetChildren();

// Bentley.DgnPlatformNET.DgnPlatformNETException: 'Bad StatusInt: 32768'
// cellToBeModified.ReplaceInModel(originalCell);

Snippet 2:

Element parentElement = selected.ParentElement;
CellHeaderElement cellToBeModified = parentElement as CellHeaderElement;
CellHeaderElement originalCell = Element.GetFromElementRef(cellToBeModified.GetNativeElementRef()) as CellHeaderElement;

cellToBeModified.ExposeChildren(ExposeChildrenReason.Edit);
bool exposeResult = cellToBeModified.ExposeChildren(ExposeChildrenReason.Edit); // true returned
ChildElementCollection children = cellToBeModified.GetChildren();

foreach (Element component in children)
{
    if (component is LineStringElement)
    {
        Element original = Element.GetFromElementRef(component.GetNativeElementRef());
        ElementPropertiesGetter getter = new ElementPropertiesGetter(component);

        if (getter.Level == this.levelCircle.LevelId)
        {
            ElementPropertiesSetter setter = new ElementPropertiesSetter();
            setter.SetLevel(this.levelLines.LevelId);
            bool status = setter.Apply(component);

            // Bentley.DgnPlatformNET.DgnPlatformNETException: 'Bad StatusInt: 69645'
            // component.ReplaceInModel(original);
        }
    }
}

// Bentley.DgnPlatformNET.DgnPlatformNETException: 'Bad StatusInt: 32768'
// cellToBeModified.ReplaceInModel(originalCell);

I do not know whether I do not understand API right, so the code is wrong, or there is a bug in API implementation.

With regards,

  Jan

communities.bentley.com/.../N014-cell-modification.dgn