FIX: Add explicit interface support

doc/changelog.d/1058.fixed.md

@@ -0,0 +1 @@
+Add explicit interface support

src/ansys/mechanical/core/embedding/app.py

@@ -181,8 +181,8 @@ def __init__(self, db_file=None, private_appdata=False, **kwargs):
             profile.update_environment(os.environ)
             atexit.register(_cleanup_private_appdata, profile)
 
-        self._app = _start_application(configuration, self._version, db_file)
         runtime.initialize(self._version)
+        self._app = _start_application(configuration, self._version, db_file)
         connect_warnings(self)
         self._poster = None
 

src/ansys/mechanical/core/embedding/runtime.py

@@ -22,6 +22,7 @@
 
 """Runtime initialize for pythonnet in embedding."""
 
+from importlib.metadata import distribution
 import os
 
 from ansys.mechanical.core.embedding.logger import Logger
@@ -44,6 +45,25 @@
     Ansys.Mechanical.CPython.Codecs.FunctionCodec.Register()
 
 
+def _bind_assembly_for_explicit_interface(assembly_name: str):
+    """Bind the assembly for explicit interface implementation."""
+    # if pythonnet is not installed, we can't bind the assembly
+    try:
+        distribution("pythonnet")
+        return
+    except ModuleNotFoundError:
+        pass
+
+    import clr
+
+    assembly = clr.AddReference(assembly_name)
+    from Python.Runtime import BindingManager, BindingOptions
+
+    binding_options = BindingOptions()
+    binding_options.AllowExplicitInterfaceImplementation = True
+    BindingManager.SetBindingOptions(assembly, binding_options)
+
+
 def initialize(version: int) -> None:
     """Initialize the runtime.
 
@@ -59,3 +79,5 @@
         # function codec is distributed with pymechanical on linux only
         # at version 242 or later
         __register_function_codec()
+
+    _bind_assembly_for_explicit_interface("Ansys.ACT.WB1")

tests/embedding/test_app.py

@@ -96,6 +96,21 @@ def test_app_update_globals_after_open(embedded_app, assets):
     Model.AddNamedSelection()
 
 
+@pytest.mark.embedding
+def test_explicit_interface(embedded_app):
+    """Test save and open of the Application class."""
+    embedded_app.update_globals(globals())
+    try:
+        namedselection = Model.AddNamedSelection()
+        ids = list(namedselection.Ids)
+        assert len(ids) == 0, f"Expected an empty Ids list, but got {ids}."
+    except AttributeError as e:
+        pytest.fail(
+            f"{str(e)}. This might be related to pythonnet."
+            "Uninstall pythonnet and install ansys-pythonnet."
+        )
+
+
 @pytest.mark.embedding
 def test_app_version(embedded_app):
     """Test version of the Application class."""