AccountingNext/Schaad.Accounting.UI/Components/Pages/Reports/BalanceSheetReport.razor
Claudio Schaad f9084dc074 PR P: full async I/O top to bottom (item 19)
Every repository, service, Blazor page/dialog, and test now uses
async/await. Single atomic diff; the codebase does not compile in
intermediate states.

- BaseRepository: LoadListAsync/LoadAsync/SaveAsync return Task<T>;
  per-file locks use SemaphoreSlim so waiters can await; Save
  serialises to a MemoryStream sync (XmlSerializer has no async
  form), then File.WriteAllBytesAsync + sync File.Move.
- RepositoryCache.GetOrLoadAsync takes a Func<Task<List<T>>>.
- All 7 repository interfaces + implementations async.
- All service interfaces + implementations async (except vendor
  IFxService and stateless IFxConverter / SettingsService).
- Every Blazor OnInitializedAsync switches to await base.
- Test suite fully async, 42 tests pass.

AccountRepository.EnsureAccountsFile keeps two .GetAwaiter().GetResult()
bridges because it runs from the constructor.

Null-render guard follow-up (folded in):
Blazor now renders the component once with fields at their initial
values while OnInitializedAsync awaits — so fields declared `= null!`
are actually null on that first render and things like
`accounts.GroupBy(...)` throw ArgumentNullException. Fixed across
Transactions, BalanceReport, BalanceSheetReport, ProfitLossReport,
DetailReport, Assets, Spendings, SpendingsOverTime, TransactionDialog,
TransactionSplitDialog, and BookingRuleDialog:
- Collection fields initialise to [] so first-render loops are empty.
- Single-object data fields become nullable; the razor wraps
  consumption in `@if (field is null) { <p>Lädt…</p> return; }`.
- <PlotlyChart> guarded behind a null check on config/layout/data so
  Plotly.Blazor's @bind doesn't see nulls.
- Header/footer strings initialise to "" instead of null!.

Architectural hygiene on a single-user local Blazor Server app: the
observed win is one File.ReadAllBytesAsync and one
File.WriteAllBytesAsync per Load/Save, and after PR D each file is
loaded at most once per SignalR circuit.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-07-03 18:30:44 +02:00

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@page "/BalanceSheetReport"
@if (balanceSheet is null)
{
<p>Lädt…</p>
return;
}
<h3>@header</h3>
<a href="javascript:window.print()" class="hidePrint">Print</a>
<br />
<br />
<table class="report">
<tbody>
<tr>
<td colspan="3" class="header">Einnahmen</td>
</tr>
<tr>
<td colspan="3"><hr /></td>
</tr>
@foreach (var account in balanceSheet.ActivaAccountList.OrderBy(m => m.Number))
{
@if (account.StartBalanceCHF == 0) { continue; }
<tr>
<td>@account.Number</td>
<td>Vortrag von @(balanceSheet.Year - 1) / @account.Name</td>
<td class="right">@Math.Abs(account.StartBalanceCHF).ToFormattedString()</td>
</tr>
}
@foreach (var account in balanceSheet.IncomeAccountList.OrderBy(m => m.Number))
{
@if (account.BalanceCHF == 0) { continue; }
<tr>
<td>@account.Number</td>
<td>@account.Name</td>
<td class="right">@Math.Abs(account.BalanceCHF).ToFormattedString()</td>
</tr>
}
<tr>
<td colspan="3"><hr /></td>
</tr>
<tr>
<td colspan="3" class="header">Ausgaben</td>
</tr>
<tr>
<td colspan="3"><hr /></td>
</tr>
@foreach (var account in balanceSheet.ExpensesAccountList.OrderBy(m => m.Number))
{
@if (account.BalanceCHF == 0) { continue; }
<tr>
<td>@account.Number</td>
<td>@account.Name</td>
<td class="right">@account.BalanceCHF.ToFormattedString()</td>
</tr>
}
<tr>
<td colspan="3"><hr /></td>
</tr>
<tr>
<td colspan="2">Total Einnahmen</td>
<td class="right">@balanceSheet.ProfitCHF.ToFormattedString()</td>
</tr>
<tr>
<td colspan="2">Total Ausgaben</td>
<td class="right sum">-@balanceSheet.LossCHF.ToFormattedString()</td>
</tr>
<tr>
<td colspan="2" class="total">Übertrag @(balanceSheet.Year + 1)</td>
<td class="right total sum">CHF @win.ToFormattedString()</td>
</tr>
<tr>
<td colspan="4" style="height: 30px">&nbsp;</td>
</tr>
<tr>
<td colspan="4" class="footer">@footer</td>
</tr>
</tbody>
</table>