Throw CLR exceptions as Python exceptions in dynamic class objects

Author: jhonabreul

src/embed_tests/TestPropertyAccess.cs

@@ -1247,6 +1247,37 @@ def InvokeModel(self):
                 $"Elapsed: {stopwatch.Elapsed.TotalMilliseconds}ms for {iterations} iterations. {thousandInvocationsPerSecond} KIPS");
         }
 
+        [TestCaseSource(nameof(DynamicPropertiesGetterTestCases))]
+        public void TestGetPublicDynamicObjectPropertyCanCatchException(object property)
+        {
+            dynamic model = PyModule.FromString("module", @"
+from clr import AddReference
+AddReference(""Python.EmbeddingTest"")
+AddReference(""System"")
+
+from Python.EmbeddingTest import *
+
+class TestGetPublicDynamicObjectPropertyThrowsPythonException:
+    def CallDynamicMethodWithoutCatchingExceptions(self, fixture):
+        return fixture.DynamicMethod()
+
+    def CallDynamicMethodCatchingExceptions(self, fixture, defaultValue):
+        try:
+            return fixture.DynamicMethod()
+        except:
+            return defaultValue
+").GetAttr("TestGetPublicDynamicObjectPropertyThrowsPythonException").Invoke();
+
+            dynamic fixture = new DynamicFixture();
+            fixture.DynamicMethod = new Func<string>(() => throw new ArgumentException("Test"));
+
+            using (Py.GIL())
+            {
+                Assert.Throws<ArgumentException>(() => model.CallDynamicMethodWithoutCatchingExceptions(fixture));
+                Assert.AreEqual(property, model.CallDynamicMethodCatchingExceptions(fixture, property).AsManagedObject(property.GetType()));
+            }
+        }
+
         public interface IModel
         {
             void InvokeModel();

src/runtime/Types/DynamicClassObject.cs

@@ -86,6 +86,12 @@ public static NewReference tp_getattro(BorrowedReference ob, BorrowedReference k
                 {
                     // Do nothing, AttributeError was already raised in Python side and it was not cleared.
                 }
+                // Catch C# exceptions and raise them as Python exceptions.
+                catch(Exception exception)
+                {
+                    Exceptions.Clear();
+                    Exceptions.SetError(exception);
+                }
             }
 
             return result;
@@ -110,7 +116,15 @@ public static int tp_setattro(BorrowedReference ob, BorrowedReference key, Borro
             var value = ((CLRObject)GetManagedObject(val))?.inst ?? PyObject.FromNullableReference(val);
 
             var callsite = SetAttrCallSite(name, clrObjectType);
-            callsite.Target(callsite, clrObj.inst, value);
+            try
+            {
+                callsite.Target(callsite, clrObj.inst, value);
+            }
+            // Catch C# exceptions and raise them as Python exceptions.
+            catch (Exception exception)
+            {
+                Exceptions.SetError(exception);
+            }
 
             return 0;
         }