AyCode.Blazor/docs/ARCHITECTURE.md

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# Architecture
## Dependency Graph
```
AyCode.Core Solution (DLL references)
AyCode.Blazor.Models ← AyCode.Blazor.Models.Server
AyCode.Blazor.Components ← AyCode.Blazor.Controllers
AyCode.Maui.Core (MAUI Hybrid host)
```
**Rule:** UI projects reference AyCode.Core via DLL (not ProjectReference). This separates build graphs.
## How It Works
### Blazor Server
1. **AyCode.Blazor.Components** provides all UI components (grids, card views, forms)
2. Components use **AcSignalRDataSource** to communicate with server via SignalR
3. SignalR uses **AcBinaryHubProtocol** for high-performance binary serialization
4. Grid filters are serialized as **AcExpressionNode** trees
### MAUI Hybrid
1. **AyCode.Maui.Core** hosts Blazor components in a WebView
2. Same components, same SignalR connection — different host
3. Platform-specific code in `Platforms/` folders (Android, iOS, Windows)
## Data Flow
```
User → DxGrid → AcSignalRDataSource → SignalR (AcBinary) → Server Hub → DAL → Database
User ← DxGrid ← AcSignalRDataSource ← SignalR (AcBinary) ← Server Hub
```
## Key Design Decisions
- **DevExpress 25.1.3** exclusively — no mixing with other component libraries
- **SignalR over REST** for grid data — enables real-time updates and binary protocol
- **Expression serialization** — grid filters evaluated server-side, not client-side
- **Shared components** — Blazor Server and MAUI Hybrid use the exact same component library