Add project name normalization to match aspire's code generator logic

src/ProjectTemplates/Microsoft.Extensions.AI.Templates/src/ChatWithCustomData/.template.config/template.json

@@ -499,6 +499,12 @@
       "valueTransform": "vectorStoreIndexNameTransform",
       "replaces": "data-ChatWithCustomData-CSharp.Web-"
     },
+    "aspireClassNameReplacer": {
+      "type": "derived",
+      "valueSource": "name",
+      "valueTransform": "aspireClassName_Formatting",
+      "replaces": "ChatWithCustomData_CSharp_Web_AspireClassName"
+    },
     "webProjectNamespaceAdjuster": {
       "type": "generated",
       "generator": "switch",
@@ -524,6 +530,33 @@
     }
   },
   "forms": {
+    "aspireClassName_ReplaceInvalidChars_DigitDots": {
+      "identifier": "replace",
+      "pattern": "((?<=\\.)|^)(?=\\d)",
+      "replacement": "_",
+      "description": "Insert underscore before digits at start or after a dot"
+    },
+    "aspireClassName_ReplaceInvalidChars_NonWords": {
+      "identifier": "replace",
+      "pattern": "\\W",
+      "replacement": "_",
+      "description": "Replace non-word characters with underscore"
+    },
+    "aspireClassName_AppendWeb": {
+      "identifier": "replace",
+      "pattern": "^(.*)$",
+      "replacement": "$1_Web",
+      "description": "Append _Web to the project name"
+    },
+    "aspireClassName_Formatting": {
+      "identifier": "chain",
+      "steps": [
+        "aspireClassName_ReplaceInvalidChars_DigitDots",
+        "aspireClassName_ReplaceInvalidChars_NonWords",
+        "aspireClassName_AppendWeb"
+      ],
+      "description": "Normalize and add _Web suffix"
+    },
     "vectorStoreIndexNameTransform": {
       "identifier": "chain",
       "steps": [

src/ProjectTemplates/Microsoft.Extensions.AI.Templates/src/ChatWithCustomData/ChatWithCustomData-CSharp.AppHost/Program.cs

@@ -51,7 +51,7 @@
 #else // UseLocalVectorStore
 #endif
 
-var webApp = builder.AddProject<Projects.ChatWithCustomData_CSharp_Web>("aichatweb-app");
+var webApp = builder.AddProject<Projects.ChatWithCustomData_CSharp_Web_AspireClassName>("aichatweb-app");
 #if (IsOllama) // AI SERVICE PROVIDER REFERENCES
 webApp
     .WithReference(chat)

test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/AIChatWebExecutionTests.cs

@@ -71,6 +71,28 @@ public async Task CreateRestoreAndBuild_AspireTemplate(params string[] args)
         await Fixture.BuildProjectAsync(project);
     }
 
+    /// <summary>
+    /// Tests build for various project name formats, including dots and other
+    /// separators, to trigger the class name normalization bug described
+    /// in https://github.com/dotnet/extensions/issues/6811
+    /// This runs for all provider combinations with --aspire true and different
+    /// project names to ensure the bug is caught in all scenarios.
+    /// </summary>
+    [Theory]
+    [MemberData(nameof(GetProjectNameVariants))]
+    public async Task CreateRestoreAndBuild_ProjectNameVariants(string provider, string projectName)
+    {
+        var project = await Fixture.CreateProjectAsync(
+            templateName: "aichatweb",
+            projectName: projectName,
+            args: new[] { "--aspire", $"--provider={provider}" });
+
+        project.StartupProjectRelativePath = $"{projectName}.AppHost";
+
+        await Fixture.RestoreProjectAsync(project);
+        await Fixture.BuildProjectAsync(project);
+    }
+
     private static readonly (string name, string[] values)[] _templateOptions = [
         ("--provider",          ["azureopenai", "githubmodels", "ollama", "openai"]),
         ("--vector-store",      ["azureaisearch", "local", "qdrant"]),
@@ -158,4 +180,26 @@ private static IEnumerable<string[]> GetAllPossibleOptions(ReadOnlyMemory<(strin
             }
         }
     }
+
+    public static IEnumerable<object[]> GetProjectNameVariants()
+    {
+        foreach (string provider in new[] { "ollama", "openai", "azureopenai", "githubmodels" })
+        {
+            foreach (string projectName in new[]
+            {
+            "dot.name",
+            "project.123",
+            "space name",
+            "mix.ed-dash_name 123",
+            ".1My.Projec-",
+            "1Project123",
+            "11double",
+            "1",
+            "nomatch"
+        })
+            {
+                yield return new object[] { provider, projectName };
+            }
+        }
+    }
 }