Sharepoint-Toolbox/.planning/milestones/v1.0-phases/01-foundation/01-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	requirements-completed	duration	completed
01-foundation	02	core	wpf dotnet10 csom pnp-framework serilog sharepoint pagination retry messaging csharp	01-01 (solution scaffold, NuGet packages)	TenantProfile model matching JSON schema (Name/TenantUrl/ClientId) OperationProgress record with Indeterminate factory for IProgress<T> pattern TenantSwitchedMessage and LanguageChangedMessage broadcast-ready via WeakReferenceMessenger SharePointPaginationHelper async iterator bypassing 5k item limit via ListItemCollectionPosition ExecuteQueryRetryHelper exponential backoff on 429/503 with IProgress<OperationProgress> surfacing LogPanelSink custom Serilog ILogEventSink writing to RichTextBox via Dispatcher.InvokeAsync	01-03 (ProfileService uses TenantProfile) 01-04 (MsalClientFactory uses TenantProfile.ClientId/TenantUrl) 01-05 (TranslationSource sends LanguageChangedMessage; LoggingIntegration uses LogPanelSink) 01-06 (FeatureViewModelBase uses OperationProgress + IProgress<T> pattern) 02-xx (all SharePoint feature services use pagination and retry helpers)	added patterns IAsyncEnumerable<ListItem> with [EnumeratorCancellation] for correct WithCancellation support ListItemCollectionPosition loop (do/while until null) for CSOM pagination past 5k items Exponential backoff delay = 2^attempt * 5s (10, 20, 40, 80, 160s) up to MaxRetries=5 WeakReferenceMessenger messages via ValueChangedMessage<T> base class Dispatcher.InvokeAsync for thread-safe UI writes from Serilog background thread	created modified SharepointToolbox/Core/Models/TenantProfile.cs SharepointToolbox/Core/Models/OperationProgress.cs SharepointToolbox/Core/Messages/TenantSwitchedMessage.cs SharepointToolbox/Core/Messages/LanguageChangedMessage.cs SharepointToolbox/Core/Helpers/SharePointPaginationHelper.cs SharepointToolbox/Core/Helpers/ExecuteQueryRetryHelper.cs SharepointToolbox/Infrastructure/Logging/LogPanelSink.cs	TenantProfile is a plain class (not record) — mutable for System.Text.Json deserialization; fields Name/TenantUrl/ClientId match existing JSON schema casing SharePointPaginationHelper uses [EnumeratorCancellation] on ct parameter — required for correct cancellation forwarding when callers use WithCancellation(ct) ExecuteQueryRetryHelper uses catch-when filter with IsThrottleException — matches 429/503 status codes and 'throttl' text in message, covers PnP.Framework exception surfaces	FOUND-05 FOUND-06 FOUND-07 FOUND-08	1min	2026-04-02

Phase 1 Plan 02: Core Models, Messages, and Infrastructure Helpers Summary

7 Core/Infrastructure files providing typed contracts (TenantProfile, OperationProgress, messages, CSOM pagination helper, throttle-aware retry helper, RichTextBox Serilog sink) — 0 errors, 0 warnings

Performance

• Duration: 1 min
• Started: 2026-04-02T10:04:59Z
• Completed: 2026-04-02T10:06:00Z
• Tasks: 2
• Files modified: 7

Accomplishments

• All 7 Core/Infrastructure files created and compiling with 0 errors, 0 warnings
• TenantProfile fields match JSON schema exactly (Name/TenantUrl/ClientId)
• OperationProgress record with Indeterminate factory, usable by all feature services via IProgress
• TenantSwitchedMessage and LanguageChangedMessage correctly inherit ValueChangedMessage for WeakReferenceMessenger broadcast
• SharePointPaginationHelper iterates past 5,000 items using ListItemCollectionPosition do/while loop; RowLimit=2000
• ExecuteQueryRetryHelper surfaces retry events via IProgress with exponential backoff (10s, 20s, 40s, 80s, 160s)
• LogPanelSink writes color-coded, timestamped entries to RichTextBox via Dispatcher.InvokeAsync for thread safety

Task Commits

Each task was committed atomically:

1. Task 1: Core models and WeakReferenceMessenger messages - ddb216b (feat)
2. Task 2: SharePointPaginationHelper, ExecuteQueryRetryHelper, LogPanelSink - c297801 (feat)

Plan metadata: (docs commit follows)

Files Created/Modified

• SharepointToolbox/Core/Models/TenantProfile.cs - Plain class; Name/TenantUrl/ClientId match JSON schema
• SharepointToolbox/Core/Models/OperationProgress.cs - Record with Indeterminate factory; IProgress contract
• SharepointToolbox/Core/Messages/TenantSwitchedMessage.cs - ValueChangedMessage; WeakReferenceMessenger broadcast
• SharepointToolbox/Core/Messages/LanguageChangedMessage.cs - ValueChangedMessage; WeakReferenceMessenger broadcast
• SharepointToolbox/Core/Helpers/SharePointPaginationHelper.cs - Async iterator; ListItemCollectionPosition loop; [EnumeratorCancellation]
• SharepointToolbox/Core/Helpers/ExecuteQueryRetryHelper.cs - Retry on 429/503/throttle; exponential backoff; IProgress surfacing
• SharepointToolbox/Infrastructure/Logging/LogPanelSink.cs - ILogEventSink; Dispatcher.InvokeAsync; color-coded by level

Decisions Made

• TenantProfile is a plain mutable class (not a record) — System.Text.Json deserialization requires a parameterless constructor and settable properties; field names match the existing JSON schema exactly to avoid serialization mismatches.
• SharePointPaginationHelper.GetAllItemsAsync decorates ct with [EnumeratorCancellation] — without this attribute, cancellation tokens passed via WithCancellation() on the async enumerable are silently ignored. This is a correctness requirement for callers who use the cancellation pattern.
• ExecuteQueryRetryHelper.IsThrottleException checks for "429", "503", and "throttl" (case-insensitive) — PnP.Framework surfaces HTTP errors in the exception message rather than a dedicated exception type; this covers all known throttle surfaces.

Deviations from Plan

Auto-fixed Issues

1. [Rule 2 - Missing critical functionality] Added [EnumeratorCancellation] attribute to SharePointPaginationHelper

• Found during: Task 2 (dotnet build)
• Issue: CS8425 warning — async iterator with CancellationToken ct parameter missing [EnumeratorCancellation]; without it, cancellation via WithCancellation(ct) on the IAsyncEnumerable<T> is silently dropped, breaking cancellation for all callers
• Fix: Added using System.Runtime.CompilerServices; and [EnumeratorCancellation] attribute on the ct parameter
• Files modified: SharepointToolbox/Core/Helpers/SharePointPaginationHelper.cs
• Verification: Build 0 warnings, 0 errors after fix
• Committed in: c297801 (Task 2 commit)

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Total deviations: 1 auto-fixed (Rule 2 — missing critical functionality for correct cancellation behavior) Impact on plan: Fix required for correct operation. One line change, no scope creep.

Issues Encountered

None beyond the auto-fixed deviation above.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• All contracts in place for plan 01-03 (ProfileService uses TenantProfile)
• All contracts in place for plan 01-04 (MsalClientFactory uses TenantProfile.ClientId/TenantUrl)
• All contracts in place for plan 01-05 (LoggingIntegration uses LogPanelSink; LanguageChangedMessage for TranslationSource)
• All contracts in place for plan 01-06 (FeatureViewModelBase uses OperationProgress + IProgress)
• All Phase 2+ SharePoint feature services can use pagination and retry helpers immediately

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Phase: 01-foundation Completed: 2026-04-02