Create Attributes and properties for model objects using .NET API

By Xiaodong Liang

The current .NET API does not provide the related objects. But you can take advantage of COM API by COM interop. The chapter 10 of \api\net\documentation\ NET Developers Guide.pdf to know more about COM interop. The following code snippet is based on the sample \api\net\examples\PlugIns\APICallsCOMPlugin.

private void addProperty()

{

    ComApi.InwOpState10 state;

    state = ComApiBridge.ComApiBridge.State;

 

    // get current selection

    ModelItemCollection modelItemCollectionIn =

        new ModelItemCollection(

            Autodesk.Navisworks.Api.Application.ActiveDocument.

            CurrentSelection.SelectedItems);

 

    // get the selection in COM

    ComApi.InwOpSelection comSelectionOut =

    ComApiBridge.ComApiBridge.ToInwOpSelection(modelItemCollectionIn);

 

    // get paths within the selection

    ComApi.InwSelectionPathsColl oPaths = comSelectionOut.Paths();

    ComApi.InwOaPath3 oPath = (ComApi.InwOaPath3)oPaths.Last();

 

    // get properties collection of the path

    ComApi.InwGUIPropertyNode2 propn =

        (ComApi.InwGUIPropertyNode2)state.GetGUIPropertyNode(oPath, true);

 

    // create new property category

    // (new tab in the properties dialog)

    ComApi.InwOaPropertyVec newPvec =

        (ComApi.InwOaPropertyVec)state.ObjectFactory(

        ComApi.nwEObjectType.eObjectType_nwOaPropertyVec, null, null);

    // create new property

    ComApi.InwOaProperty newP =

        (ComApi.InwOaProperty)state.ObjectFactory(

        ComApi.nwEObjectType.eObjectType_nwOaProperty, null, null);

 

    // set the name, username and value of the new property

    newP.name = "demo_Property_Name";

    newP.UserName = "demo_Property_UserName";

    newP.value = "demo_Property_Value";

 

    // add the new property to the new property category

    newPvec.Properties().Add(newP);

 

    // add the new property category to the path

    propn.SetUserDefined(0, "demo_PropertyTab_Name",

        "demo_PropertyTab_InteralName", newPvec);

}