# BackgroundBuilder

An MVVM WPF application (.NET 6) providing an Excel-like editor for the `contatos` table in PostgreSQL.

## Prerequisites

- .NET 6 SDK
- PostgreSQL database with table:

      ```sql
      CREATE TABLE public.contatos (
          ramal text PRIMARY KEY NOT NULL,
          nome text NOT NULL,
          email text,
          area text,
          aniversario date,
          "isComando" boolean NOT NULL
      );
      ```
## Setup
1. Edit appsettings.json, set your ConnectionStrings:ContatosDb.
2. In a terminal:
	```bash
	dotnet restore
	dotnet build
	dotnet run --project BackgroundBuilder.csproj
	```
3. The main window will appear; on load it fetches and displays all contatos.

## Architecture
- MVVM with MVVM with ObservableObject, RelayCommand.
- DI via Microsoft.Extensions.Hosting.
- Repositories (PostgresContatoRepository) handle all DB I/O with Dapper.
- Services (DatabaseService) manage the Npgsql connection.
- ViewModels free of data-access logic: only orchestration.
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### New Background & Export Features

- **Select Background…**  
  Opens a file picker—choose any image (PNG, JPG, BMP). That image becomes your canvas.

- **Create Image…**  
  Saves the current DataGrid overlaid on the background as a single PNG.  
  Uses WPF’s `RenderTargetBitmap` and `PngBitmapEncoder` under the hood.
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