C#: exclude parameterless constructors from DataFlowTargetApi

csharp/ql/src/utils/modelgenerator/internal/CaptureModelsSpecific.qll

@@ -30,6 +30,11 @@ private predicate isHigherOrder(CS::Callable api) {
   )
 }
 
+/** Holds if the given API is a constructor without parameters. */
+private predicate isParameterlessConstructor(CS::Callable api) {
+  api instanceof CS::Constructor and api.getNumberOfParameters() = 0
+}
+
 /**
  * Holds if it is relevant to generate models for `api`.
  */
@@ -38,7 +43,8 @@ private predicate isRelevantForModels(CS::Callable api) {
   api.getDeclaringType().getNamespace().getFullName() != "" and
   not api instanceof CS::ConversionOperator and
   not api instanceof Util::MainMethod and
-  not api instanceof CS::Destructor
+  not api instanceof CS::Destructor and
+  not isParameterlessConstructor(api)
 }
 
 /**