Make the Reference type generic

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

@@ -11,5 +11,25 @@ namespace Azure.ResourceManager.Core
     [AttributeUsage(AttributeTargets.Class)]
     public class ReferenceTypeAttribute : Attribute
     {
+        /// <summary>
+        /// Instatiate a new reference type attribute.
+        /// </summary>
+        /// <param name="genericType"> The generic type for this reference type. </param>
+        public ReferenceTypeAttribute(Type genericType)
+        {
+            GenericType = genericType;
+        }
+
+        /// <summary>
+        /// Instatiate a new reference type attribute.
+        /// </summary>
+        public ReferenceTypeAttribute() : this(null)
+        {
+        }
+
+        /// <summary>
+        /// Get the generic type for this reference type.
+        /// </summary>
+        public Type GenericType { get; }
     }
 }

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

@@ -8,7 +8,7 @@ namespace Azure.ResourceManager.Core
     /// <summary>
     /// A class representing the base resource used by all azure resources.
     /// </summary>
-    [ReferenceType]
+    [ReferenceType(typeof(TenantResourceIdentifier))]
     public abstract class Resource<TIdentifier> : IEquatable<Resource<TIdentifier>>, IEquatable<string>,
         IComparable<Resource<TIdentifier>>, IComparable<string> where TIdentifier : TenantResourceIdentifier
     {

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

@@ -9,7 +9,7 @@ namespace Azure.ResourceManager.Core
     /// <summary>
     /// Generic representation of a tracked resource.  All tracked resources should extend this class
     /// </summary>
-    [ReferenceType]
+    [ReferenceType(typeof(TenantResourceIdentifier))]
     public abstract partial class TrackedResource<TIdentifier> : Resource<TIdentifier> where TIdentifier : TenantResourceIdentifier
     {
         private IDictionary<string, string> _tag = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);