diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/AbiCustomRegistry.cpp b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/AbiCustomRegistry.cpp
index 571778398a..c9bfe54571 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/AbiCustomRegistry.cpp
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/AbiCustomRegistry.cpp
@@ -28,6 +28,7 @@ onnx::OpSchema::FormalParameterOption AbiCustomRegistry::ConvertFormalParameterO
 
         default:
             THROW_HR(E_NOTIMPL);
+            return onnx::OpSchema::FormalParameterOption::Single;
     }
 }
 
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/DmlCommon.cpp b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/DmlCommon.cpp
index 70a29a2d3d..37eb719f08 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/DmlCommon.cpp
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/DmlCommon.cpp
@@ -87,7 +87,9 @@ MLOperatorTensorDataType GetMlDataTypeFromDmlDataType(DML_TENSOR_DATA_TYPE tenso
     case DML_TENSOR_DATA_TYPE_INT64:    return MLOperatorTensorDataType::Int64;
     case DML_TENSOR_DATA_TYPE_FLOAT64:  return MLOperatorTensorDataType::Double;
 
-    default: ML_INVALID_ARGUMENT("Unknown DML_TENSOR_DATA_TYPE.");
+    default:
+        ML_INVALID_ARGUMENT("Unknown DML_TENSOR_DATA_TYPE.");
+        return MLOperatorTensorDataType::Undefined;
     };
 }
 
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiHelpers.h b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiHelpers.h
index 4689bae39d..b86aa302ec 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiHelpers.h
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiHelpers.h
@@ -56,7 +56,9 @@ struct ActivationOperatorDesc
         case DML_OPERATOR_ACTIVATION_TANH: return { activationType, &params.tanh };
         case DML_OPERATOR_ACTIVATION_THRESHOLDED_RELU: return { activationType, &params.thresholdedRelu };
         case DML_OPERATOR_ACTIVATION_SHRINK: return { activationType, &params.shrink };
-        default: THROW_HR(E_INVALIDARG);
+        default:
+            THROW_HR(E_INVALIDARG);
+            return { activationType, &params.relu };
         }
     }
 };
@@ -206,9 +208,9 @@ private:
 
         ~DynamicBucket()
         {
-            if (data)
+            if (this->data)
             {
-                (void)VirtualFree(data, 0, MEM_RELEASE);
+                (void)VirtualFree(this->data, 0, MEM_RELEASE);
             }
         }
     };
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiTraits.h b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiTraits.h
index 2b177faeda..12cf34b974 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiTraits.h
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/ApiTraits.h
@@ -2159,6 +2159,7 @@ auto OperatorTypeVisitor(DML_OPERATOR_TYPE type, Visitor&& visitor, Ts&&... args
 
     default:
         THROW_HR(E_INVALIDARG);
+        return std::invoke(std::forward<Visitor>(visitor), DML_ACTIVATION_RELU_OPERATOR_DESC{}, std::forward<Ts>(args)...);
     }
 }
 
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/GeneratedSchemaHelpers.h b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/GeneratedSchemaHelpers.h
index 7630e98489..0fcc3336c0 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/GeneratedSchemaHelpers.h
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/External/DirectMLHelpers/GeneratedSchemaHelpers.h
@@ -1484,7 +1484,9 @@ inline const DML_OPERATOR_SCHEMA& GetSchema(DML_OPERATOR_TYPE operatorType)
     case DML_OPERATOR_ACTIVATION_THRESHOLDED_RELU: return DML_ACTIVATION_THRESHOLDED_RELU_OPERATOR_SCHEMA;
     case DML_OPERATOR_ACTIVATION_SHRINK: return DML_ACTIVATION_SHRINK_OPERATOR_SCHEMA;
 
-    default: THROW_HR(E_INVALIDARG);
+    default:
+        THROW_HR(E_INVALIDARG);
+        return DML_ACTIVATION_RELU_OPERATOR_SCHEMA;
     }
 }
 
@@ -2052,7 +2054,11 @@ inline AbstractOperatorDesc ConvertOperatorDesc(const DML_OPERATOR_DESC& opDesc)
         return AbstractOperatorDesc(
             &DML_ACTIVATION_SHRINK_OPERATOR_SCHEMA,
             GetFields(*static_cast<const DML_ACTIVATION_SHRINK_OPERATOR_DESC*>(opDesc.Desc)));
-    default: THROW_HR(E_INVALIDARG);
+    default:
+        THROW_HR(E_INVALIDARG);
+        return AbstractOperatorDesc(
+            &DML_ACTIVATION_RELU_OPERATOR_SCHEMA,
+            GetFields(*static_cast<const DML_ACTIVATION_RELU_OPERATOR_DESC*>(opDesc.Desc)));
     }
 
 }
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/GraphDescBuilder.cpp b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/GraphDescBuilder.cpp
index eddea1e78b..d9b8687b83 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/GraphDescBuilder.cpp
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/GraphDescBuilder.cpp
@@ -25,6 +25,7 @@ namespace Dml::GraphDescBuilder
 
         assert(false);
         THROW_HR(E_UNEXPECTED);
+        return node.OutputDefs()[0]->Name();
     }
 
     GraphDesc BuildGraphDesc(
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/MLOperatorAuthorImpl.cpp b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/MLOperatorAuthorImpl.cpp
index 30e96e0621..3085765edb 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/MLOperatorAuthorImpl.cpp
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/MLOperatorAuthorImpl.cpp
@@ -43,6 +43,7 @@ size_t AttributeValue::ElementCount() const {
       // The type is validated when default attributes are registered
       assert(false);
       THROW_HR(E_FAIL);
+      return 0;
   }
 }
 
@@ -238,6 +239,7 @@ struct MLTypeTraits<onnxruntime::MLFloat16> {
   ML_TENSOR_TYPE_CASE(onnxruntime::MLFloat16);
 
   THROW_HR(E_NOTIMPL);
+  return MLOperatorTensorDataType::Undefined;
 }
 
 #undef ML_TENSOR_TYPE_CASE
@@ -264,6 +266,7 @@ onnxruntime::MLDataType ToTensorDataType(::MLOperatorTensorDataType type) {
   ML_TENSOR_TYPE_CASE(onnxruntime::MLFloat16);
 
   THROW_HR(E_NOTIMPL);
+  return onnxruntime::DataTypeImpl::GetTensorType<float>();
 }
 
 ::MLOperatorTensorDataType ToMLTensorDataType(onnx::TensorProto_DataType type) {
@@ -315,6 +318,7 @@ onnxruntime::MLDataType ToTensorDataType(::MLOperatorTensorDataType type) {
 
     default:
       THROW_HR(E_NOTIMPL);
+      return MLOperatorTensorDataType::Undefined;
   }
 }
 
@@ -389,6 +393,7 @@ std::string ToTypeString(MLOperatorEdgeDescription desc) {
 
     default:
       THROW_HR(E_NOTIMPL);
+      return "";
   }
 }
 
@@ -594,7 +599,7 @@ HRESULT OpNodeInfoWrapper<NodeInfoImpl_t, Base1_t, Base2_t>::GetAttributeHelper(
     uint32_t elementByteSize,
     void* value) const {
   using elementType_t = typename MLAttributeTypeTraits<T>::Type;
-  static_assert(!typename MLAttributeTypeTraits<T>::IsArray, "This function only works for simple non-array types.");
+  static_assert(!MLAttributeTypeTraits<T>::IsArray, "This function only works for simple non-array types.");
   ML_CHECK_BOOL(sizeof(elementType_t) == elementByteSize);
   THROW_IF_NOT_OK(m_impl->template GetAttr<elementType_t>(name, static_cast<elementType_t*>(value)));
   return S_OK;
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/DmlOperatorRecurrentNeuralNetwork.cpp b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/DmlOperatorRecurrentNeuralNetwork.cpp
index 50499ce207..c67beb596d 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/DmlOperatorRecurrentNeuralNetwork.cpp
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/DmlOperatorRecurrentNeuralNetwork.cpp
@@ -62,6 +62,7 @@ public:
         if (direction == AttrValue::DirectionBidirectional) { return DML_RECURRENT_NETWORK_DIRECTION_BIDIRECTIONAL; }
          
         ML_INVALID_ARGUMENT("Unsupported direction"); // throws
+        return DML_RECURRENT_NETWORK_DIRECTION_FORWARD;
     }
 
     void InitActivationDescs(const MLOperatorKernelCreationContext& kernelInfo, _Out_ std::vector<DML_OPERATOR_DESC>& descs, gsl::span<const std::string> defaultActivations)
diff --git a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/OperatorUtility.cpp b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/OperatorUtility.cpp
index 5e2cfd4ccc..faf7dafe34 100644
--- a/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/OperatorUtility.cpp
+++ b/onnxruntime/core/providers/dml/DmlExecutionProvider/src/Operators/OperatorUtility.cpp
@@ -436,6 +436,7 @@ namespace Dml
             return *index;
         }
         ML_INVALID_ARGUMENT("Unknown interpolation mode");
+        return (DML_INTERPOLATION_MODE)0;
     }
 
     DML_DEPTH_SPACE_ORDER MapStringToDepthSpaceMode(std::string_view mode)
@@ -450,6 +451,7 @@ namespace Dml
             return *index;
         }
         ML_INVALID_ARGUMENT("Unknown depth/space order");
+        return (DML_DEPTH_SPACE_ORDER)0;
     }
 
 } // namespace Dml
diff --git a/onnxruntime/core/providers/dml/OperatorAuthorHelper/MLOperatorAuthorHelper.h b/onnxruntime/core/providers/dml/OperatorAuthorHelper/MLOperatorAuthorHelper.h
index a6615bd815..878249d044 100644
--- a/onnxruntime/core/providers/dml/OperatorAuthorHelper/MLOperatorAuthorHelper.h
+++ b/onnxruntime/core/providers/dml/OperatorAuthorHelper/MLOperatorAuthorHelper.h
@@ -119,7 +119,9 @@ inline size_t GetByteSizeFromMlDataType(MLOperatorTensorDataType tensorDataType)
     case MLOperatorTensorDataType::Complex64: return 8;
     case MLOperatorTensorDataType::Complex128: return 16;
     case MLOperatorTensorDataType::Undefined:
-    default: THROW_HR(E_INVALIDARG);
+    default:
+        THROW_HR(E_INVALIDARG);
+        return 0;
     };
 }
 
diff --git a/onnxruntime/core/providers/dml/OperatorAuthorHelper/OperatorHelper.cpp b/onnxruntime/core/providers/dml/OperatorAuthorHelper/OperatorHelper.cpp
index eeeced230b..c558f89776 100644
--- a/onnxruntime/core/providers/dml/OperatorAuthorHelper/OperatorHelper.cpp
+++ b/onnxruntime/core/providers/dml/OperatorAuthorHelper/OperatorHelper.cpp
@@ -163,7 +163,9 @@ namespace OperatorHelper
         case MLOperatorTensorDataType::Complex64:  return static_cast<int64_t>(*reinterpret_cast<const float*>(p)); // Read the real component.
         case MLOperatorTensorDataType::Complex128: return static_cast<int64_t>(*reinterpret_cast<const double*>(p)); // Read the real component.
         case MLOperatorTensorDataType::Undefined:
-        default: ML_INVALID_ARGUMENT("Unknown MLOperatorTensorDataType.");
+        default:
+            ML_INVALID_ARGUMENT("Unknown MLOperatorTensorDataType.");
+            return 0;
         };
     }
 
@@ -187,7 +189,9 @@ namespace OperatorHelper
         case MLOperatorTensorDataType::Complex64:  return static_cast<double>(*reinterpret_cast<const float*>(p)); // Read the real component.
         case MLOperatorTensorDataType::Complex128: return static_cast<double>(*reinterpret_cast<const double*>(p)); // Read the real component.
         case MLOperatorTensorDataType::Undefined:
-        default: ML_INVALID_ARGUMENT("Unknown MLOperatorTensorDataType.");
+        default:
+            ML_INVALID_ARGUMENT("Unknown MLOperatorTensorDataType.");
+            return 0.0;
         };
     }