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chore: small cleanups from the 2026-09 code review (checklist)

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难度
5/5
预计耗时
一周以上
新手友好度
25/100
Issue 类型
重构
描述清晰度
基本清楚
活跃度
活跃
技术栈
android, csharp, sqlite
领域
backend

调研方向

The checklist names entry points across the project, including App.axaml.cs, MainActivity.OnPause, SystemAlarmService.cs, IncidentFile.SanitizeFileName, and DispatcherTimerTicker; read the relevant unchecked item and its referenced code first. Several items involve concurrency, lifecycle, security, or cancellation across subsystems, so select a narrowly scoped item and check whether it has already been split into another issue. Done means the chosen item is implemented and its behavior is covered by appropriate tests.

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描述

enhancement

From the 2026-09-09 code review of main (35d86e1). Small, independent items; each is a short PR. Tick them off here.

  • Four copy-paste JSON stores (JsonRecentFilesStore, JsonLastSaveFolderStore, JsonLastPdfExportStore in AppLogic, JsonTrustStore in Sync) repeat the same read/deserialise/catch (JsonException)/write scaffolding. Extract one generic JsonFileStore<T> with the atomic temp+rename write that #286 added to the trust store. — #329
  • JsonTrustStore.Persist() mutates _cache before the disk write; if File.Move throws, memory and disk diverge until the next write. Write first, then commit the in-memory change (noted in the #286 review). — #331
  • AboutViewModel.cs:68-77 and LinksViewModel.cs:103-112 are byte-identical OpenUrlAsync try/catch blocks; share one helper (also listed in #167 as "URL validation + opening duplicated"). — #332
  • RemoteIncidentSession.cs:496-501: a three-line comment block is duplicated verbatim. — #331
  • TasksSection.cs:54 (PDF) uses DateTimeOffset.Now to render "overdue", so the same incident exports differently depending on wall-clock time and the section is untestable. Pass the IClock (or an explicit "as of" timestamp) into the report. — #334
  • ForceUnit.Status and RoleAssignment.Role are free strings validated against nothing; Incident.StatusChangeText (:666) switches on the string, so a typo in master data silently falls through. Validate against MasterDataSet at the session boundary, or model status as a small value type. — #355
  • App.CreateMainViewModel (App.axaml.cs:25) is a mutable public static delegate, a service-locator seam in an otherwise constructor-injected design. Pass the factory into App explicitly.
  • MainView.axaml.cs:19-32 re-attaches PropertyChanged/Cancelled/… handlers to every new PendingPrompt without detaching from the previous one. Same shape in IncidentWorkspaceView.axaml.cs:38,45. — #371
  • MainActivity.OnPause fires _ = _store?.FlushAsync() without awaiting; the last save can be lost when Android kills the process. Block briefly (with a timeout) as the desktop Exit handler does.
  • SystemAlarmService is never disposed on Android, so its temp WAV files leak.
  • SystemAlarmService._voiceTempFiles is an unsynchronized Dictionary written by TempFileFor on SerialAudioQueue's worker thread (SystemAlarmService.cs:107-125, reached from PlayBlocking :80) and enumerated by Dispose on the UI thread at exit (:152) — a cue in flight during shutdown enumerates while the other thread mutates. Same class as the DispatcherTimerTicker item below, but unlike that one this is genuinely cross-thread. While there: the temp path is a fixed lagebuch-{sound}.wav in the world-writable system temp dir (:116), with none of the per-open GUID directory and symlink refusal AttachmentTempPaths gives attachments — another local user can pre-create or symlink that path. (Found re-auditing #167.)
  • No CancellationTokenSource exists anywhere in src/; tokens are only forwarded. A slow join, a large upload or a long PDF export cannot be cancelled by the user. Wire a cancel button on the join and export flows to a real CTS.
  • IncidentFile.SanitizeFileName (#285) strips control characters but not Unicode format characters (e.g. U+202E RLO), so a display-name spoof is still possible in the Dateien list. Strip UnicodeCategory.Format too.
  • DispatcherTimerTicker allocates _subscribers.ToArray() on every tick and a throwing subscriber aborts the rest of the tick on the UI thread; isolate subscribers (also listed in #167).
  • RemoteIncidentSession's per-device attachment cache under attachment-cache/ is never evicted (also listed in #167). — split out as #382, tracked there.
  • HttpClientHandler created in RemoteIncidentSession is now disposed (#286); check SystemAlarmService._voiceTempFiles and PdfLicense._configured static state for testability while there.
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C#
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  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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