Fix namespace for ResourceData and mockable (#50865)

Author: live1206

eng/Packages.Data.props

@@ -451,6 +451,6 @@
   <PropertyGroup>
     <TestProxyVersion>1.0.0-dev.20250501.1</TestProxyVersion>
     <UnbrandedGeneratorVersion>1.0.0-alpha.20250625.1</UnbrandedGeneratorVersion>
-    <AzureGeneratorVersion>1.0.0-alpha.20250619.1</AzureGeneratorVersion>
+    <AzureGeneratorVersion>1.0.0-alpha.20250625.3</AzureGeneratorVersion>
   </PropertyGroup>
 </Project>

eng/packages/http-client-csharp-mgmt/generator/Azure.Generator.Management/src/Providers/MockableResourceProvider.cs

@@ -28,6 +28,8 @@ public MockableResourceProvider(CSharpType armCoreType, IReadOnlyList<ResourceCl
         }
         internal CSharpType ArmCoreType { get; }
 
+        protected override string BuildNamespace() => $"{base.BuildNamespace()}.Mocking";
+
         protected override string BuildName() => $"Mockable{ManagementClientGenerator.Instance.TypeFactory.ResourceProviderName}{ArmCoreType.Name}";
 
         protected override string BuildRelativeFilePath() => Path.Combine("src", "Generated", "Extensions", $"{Name}.cs");

eng/packages/http-client-csharp-mgmt/generator/Azure.Generator.Management/src/ResourceVisitor.cs

@@ -19,6 +19,46 @@ internal class ResourceVisitor : ScmLibraryVisitor
             return type;
         }
 
+        private void TransformResource(InputModelType model, TypeProvider type)
+        {
+            if (type is ModelProvider && ManagementClientGenerator.Instance.InputLibrary.IsResourceModel(model))
+            {
+                type.Update(
+                    relativeFilePath: TransformRelativeFilePath(type),
+                    name: TransformName(type));
+
+                foreach (var serialization in type.SerializationProviders)
+                {
+                    serialization.Update(
+                        relativeFilePath: TransformRelativeFilePathForSerialization(serialization),
+                        name: TransformName(serialization));
+                }
+            }
+        }
+
+        // Because we have NamespaceVisitor with VisitType in Azure.Generater, we need to override the namespace with VisitType here
+        protected override TypeProvider? VisitType(TypeProvider type)
+        {
+            if (type is not null)
+            {
+                TransformNamespaceForResource(type);
+            }
+            return type;
+        }
+
+        private void TransformNamespaceForResource(TypeProvider type)
+        {
+            if (type is ModelProvider model && ManagementClientGenerator.Instance.OutputLibrary.IsResourceModelType(model.Type))
+            {
+                type.Update(@namespace: ManagementClientGenerator.Instance.TypeFactory.PrimaryNamespace);
+
+                foreach (var serialization in type.SerializationProviders)
+                {
+                    serialization.Update(@namespace: ManagementClientGenerator.Instance.TypeFactory.PrimaryNamespace);
+                }
+            }
+        }
+
         // TODO: Go back and enable this when we have a way to handle the resource model parameters renaming via VisitMethod.
         // protected override MethodProvider? VisitMethod(MethodProvider method)
         // {
@@ -32,20 +72,6 @@ internal class ResourceVisitor : ScmLibraryVisitor
         //     return base.VisitMethod(method);
         // }
 
-        private void TransformResource(InputModelType model, TypeProvider type)
-        {
-            if (type is ModelProvider && ManagementClientGenerator.Instance.InputLibrary.IsResourceModel(model))
-            {
-                type.Update(relativeFilePath: TransformRelativeFilePath(type));
-                type.Update(name: TransformName(type));
-                foreach (var serialization in type.SerializationProviders)
-                {
-                    serialization.Update(relativeFilePath: TransformRelativeFilePathForSerialization(serialization));
-                    serialization.Update(name: TransformName(serialization));
-                }
-            }
-        }
-
         private static string TransformName(TypeProvider model) => $"{model.Name}Data";
 
         private static string TransformRelativeFilePath(TypeProvider model)

eng/packages/http-client-csharp-mgmt/generator/TestProjects/Local/Mgmt-TypeSpec/src/Generated/Extensions/MgmtTypeSpecExtensions.cs

@@ -37,7 +37,7 @@
     "dist/**"
   ],
   "dependencies": {
-    "@azure-typespec/http-client-csharp": "1.0.0-alpha.20250619.1"
+    "@azure-typespec/http-client-csharp": "1.0.0-alpha.20250625.3"
   },
   "devDependencies": {
     "@azure-tools/azure-http-specs": "0.1.0-alpha.19",