adding reference constructors attributes (#20611)

* update constructors for reference types

* fix stylecop issue

* add two way implicit for autorest deserialization

* update constructor signatures for autogen

* add attributes to define ctor types for autogen

sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/InitializationConstructor.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+
+namespace Azure.ResourceManager.Core
+{
+    /// <summary>
+    /// An attribute class indicating the constructor to use for initialization.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Constructor)]
+    public class InitializationConstructor : Attribute
+    {
+        /// <summary>
+        /// Instatiate a new InitializationConstructor attribute.
+        /// </summary>
+        public InitializationConstructor()
+        {
+        }
+    }
+}

sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/Resource.cs

@@ -9,20 +9,22 @@ namespace Azure.ResourceManager.Core
     /// A class representing the base resource used by all azure resources.
     /// </summary>
     [ReferenceType(typeof(TenantResourceIdentifier))]
-    public class Resource<TIdentifier> : IEquatable<Resource<TIdentifier>>, IEquatable<string>,
+    public abstract class Resource<TIdentifier> : IEquatable<Resource<TIdentifier>>, IEquatable<string>,
         IComparable<Resource<TIdentifier>>, IComparable<string> where TIdentifier : TenantResourceIdentifier
     {
         /// <summary>
         /// Initializes an empty instance of <see cref="Resource{TIdentifier}"/>.
         /// </summary>
-        public Resource() { }
+        [InitializationConstructor]
+        protected Resource() { }
 
         /// <summary>
         /// Initializes a new instance of <see cref="Resource{TIdentifier}"/> for deserialization.
         /// </summary>
         /// <param name="id"> The id of the resource. </param>
         /// <param name="name"> The name of the resource. </param>
         /// <param name="type"> The <see cref="ResourceType"/> of the resource. </param>
+        [SerializationConstructor]
         protected Resource(TIdentifier id, string name, ResourceType type)
         {
             Id = id;

sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SerializationConstructor.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+
+namespace Azure.ResourceManager.Core
+{
+    /// <summary>
+    /// An attribute class indicating the constructor to use for serialization.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Constructor)]
+    public class SerializationConstructor : Attribute
+    {
+        /// <summary>
+        /// Instatiate a new SerializationConstructor attribute.
+        /// </summary>
+        public SerializationConstructor()
+        {
+        }
+    }
+}

sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.cs

@@ -12,10 +12,12 @@ public partial class SubResource
         /// <summary>
         /// Initializes an empty instance of <see cref="SubResource"/>.
         /// </summary>
-        public SubResource() { }
+        [InitializationConstructor]
+        protected SubResource() { }
 
         /// <summary> Initializes a new instance of SubResource. </summary>
         /// <param name="id"> ARM resource Id. </param>
+        [SerializationConstructor]
         protected internal SubResource(string id)
         {
             Id = id;

sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/TrackedResource.cs

@@ -10,13 +10,14 @@ namespace Azure.ResourceManager.Core
     /// Generic representation of a tracked resource.  All tracked resources should extend this class
     /// </summary>
     [ReferenceType(typeof(TenantResourceIdentifier))]
-    public partial class TrackedResource<TIdentifier> : Resource<TIdentifier>
+    public abstract partial class TrackedResource<TIdentifier> : Resource<TIdentifier>
         where TIdentifier : TenantResourceIdentifier
     {
         /// <summary>
         /// Initializes an empty instance of <see cref="TrackedResource{TIdentifier}"/>.
         /// </summary>
-        public TrackedResource(LocationData location)
+        [InitializationConstructor]
+        protected TrackedResource(LocationData location)
         {
             Location = location;
         }
@@ -29,6 +30,7 @@ public TrackedResource(LocationData location)
         /// <param name="type"> The <see cref="ResourceType"/> of the resource. </param>
         /// <param name="tags"> The tags for the resource. </param>
         /// <param name="location"> The location of the resource. </param>
+        [SerializationConstructor]
         protected TrackedResource(TIdentifier id, string name, ResourceType type, IDictionary<string, string> tags, LocationData location)
             : base(id, name, type)
         {