---
phase: 04-bulk-operations-and-provisioning
plan: 05
subsystem: bulk-site-creation
tags: [pnp-framework, bulk-operations, sharepoint-site-creation, team-site, communication-site]

# Dependency graph
requires:
  - phase: 04-01
    provides: "IBulkSiteService, BulkSiteRow, BulkOperationRunner"
  - phase: 01-foundation
    provides: "ExecuteQueryRetryHelper for throttle-safe CSOM calls"
provides:
  - "BulkSiteService implementing IBulkSiteService via PnP Framework CreateSiteAsync"
  - "Team site creation with alias + owners array via TeamSiteCollectionCreationInformation"
  - "Communication site creation with auto-generated URL via CommunicationSiteCollectionCreationInformation"
  - "Member/owner assignment post-creation via CSOM AssociatedMemberGroup/AssociatedOwnerGroup"
  - "SanitizeAlias helper: removes special chars, replaces spaces with dashes, lowercases"
affects: [04-09, 04-10]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "BulkSiteService.CreateSingleSiteAsync — type dispatch (Team vs Communication) before PnP call"
    - "Communication site URL construction: https://{tenantHost}/sites/{alias}"
    - "Post-creation member add: EnsureUser + AssociatedMemberGroup.Users.AddUser per email"
    - "ParseEmails: Split(',', RemoveEmptyEntries | TrimEntries) from comma-separated CSV field"
    - "SanitizeAlias: keep letters/digits/spaces/dashes, replace space with dash, lowercase"

key-files:
  created:
    - "SharepointToolbox/Services/BulkSiteService.cs"
    - "SharepointToolbox.Tests/Services/BulkSiteServiceTests.cs"
  modified:
    - "SharepointToolbox/Services/BulkMemberService.cs"

key-decisions:
  - "BulkSiteService uses SharepointToolbox.Core.Helpers.ExecuteQueryRetryHelper (not Infrastructure.Auth) — plan had wrong using; correct namespace is Core.Helpers (established pattern from Phase 2/3 services)"
  - "Communication site URL built from adminCtx.Url host — ensures correct tenant hostname without hardcoding"

# Metrics
duration: 6min
completed: 2026-04-03
---

# Phase 04 Plan 05: BulkSiteService Implementation Summary

**BulkSiteService implements IBulkSiteService using PnP Framework CreateSiteAsync for Team and Communication site bulk creation with per-site error handling**

## Performance

- **Duration:** 6 min
- **Started:** 2026-04-03T07:57:03Z
- **Completed:** 2026-04-03T08:02:15Z
- **Tasks:** 2 (both committed together)
- **Files modified:** 3

## Accomplishments

- Implemented `BulkSiteService` with full `IBulkSiteService` contract
- Team site creation via `TeamSiteCollectionCreationInformation` with `Alias`, `DisplayName`, `IsPublic=false`, and `Owners[]`
- Communication site creation via `CommunicationSiteCollectionCreationInformation` with auto-generated URL from `adminCtx.Url` host
- Post-creation member/owner assignment via `EnsureUser` + `AssociatedMemberGroup/OwnerGroup.Users.AddUser`
- Per-site error handling delegates to `BulkOperationRunner.RunAsync` with continue-on-error semantics
- `ParseEmails` helper splits comma-separated owner/member CSV fields
- `SanitizeAlias` generates URL-safe aliases from display names
- 3 passing tests (interface check, default values, CSV field inspection) + 3 skipped (live SP required)

## Task Commits

1. **Task 1+2: Implement BulkSiteService + BulkSiteServiceTests** - `b0956ad` (feat)

## Files Created/Modified

- `SharepointToolbox/Services/BulkSiteService.cs` — Full IBulkSiteService implementation with PnP Framework
- `SharepointToolbox.Tests/Services/BulkSiteServiceTests.cs` — 3 passing + 3 skipped unit tests
- `SharepointToolbox/Services/BulkMemberService.cs` — Fixed pre-existing Group type ambiguity (Rule 1)

## Decisions Made

- `BulkSiteService` imports `SharepointToolbox.Core.Helpers` not `SharepointToolbox.Infrastructure.Auth` — plan listed wrong using directive; `ExecuteQueryRetryHelper` lives in `Core.Helpers` as established by all Phase 2/3 services
- Communication site URL is constructed from `adminCtx.Url` hostname to ensure tenant-correct URLs without hardcoding

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Fixed wrong using directive in BulkSiteService**
- **Found during:** Task 1 (implementation)
- **Issue:** Plan code had `using SharepointToolbox.Infrastructure.Auth;` — `ExecuteQueryRetryHelper` is in `SharepointToolbox.Core.Helpers`
- **Fix:** Replaced `using SharepointToolbox.Infrastructure.Auth;` with `using SharepointToolbox.Core.Helpers;`
- **Files modified:** `SharepointToolbox/Services/BulkSiteService.cs`
- **Commit:** `b0956ad`

**2. [Rule 1 - Bug] Fixed BulkMemberService.cs Group type ambiguity**
- **Found during:** Task 1 (build verification)
- **Issue:** `Group? targetGroup = null;` on line 164 was ambiguous between `Microsoft.SharePoint.Client.Group` and `Microsoft.Graph.Models.Group` — CS0104 compile error
- **Fix:** Linter auto-applied `using SpGroup = Microsoft.SharePoint.Client.Group;` alias + used `SpGroup?`
- **Files modified:** `SharepointToolbox/Services/BulkMemberService.cs`
- **Commit:** `b0956ad`

---

**Total deviations:** 2 auto-fixed (2 x Rule 1 - compile bugs)
**Impact:** Both fixes were required for compilation. No scope creep. BulkMemberService fix is out-of-scope (from a previous plan) but was blocking the build entirely.

## Issues Encountered

The WPF temp project build lock (`MainWindow.g.cs` locked by another process) prevented `dotnet build SharepointToolbox.slnx` from completing. The test project build (`dotnet build SharepointToolbox.Tests`) succeeds normally and was used for verification.

## User Setup Required

None — no external service configuration required.

## Next Phase Readiness

- `BulkSiteService` is ready for use by BulkSiteViewModel (Plan 04-09) and BulkSiteView (Plan 04-10)
- All 3 non-skip tests pass; live integration tests remain skipped pending live SP admin context
- Build: `dotnet build SharepointToolbox.Tests` succeeds with 0 errors, 0 warnings

## Self-Check: PASSED

- BulkSiteService.cs: FOUND at `SharepointToolbox/Services/BulkSiteService.cs`
- BulkSiteServiceTests.cs: FOUND at `SharepointToolbox.Tests/Services/BulkSiteServiceTests.cs`
- 04-05-SUMMARY.md: FOUND (this file)
- Commit b0956ad: FOUND

---
*Phase: 04-bulk-operations-and-provisioning*
*Completed: 2026-04-03*