Goal for this part
Support multiple named sheets in one workbook folder.
Treat 11-Sheets as the source of truth for this checkpoint. If your local tree drifted, re-clone that folder rather than mixing files from neighbors.
What you should already know
You do not need prior WPF experience for part 1. Later parts assume you finished the earlier snapshots on the same machine.
- .NET 8 SDK is installed
- You can run
dotnetfrom a terminal - WPF snapshots target Windows
Why WPF fits Gridlane
WPF’s DataGrid is a natural teaching surface for cells, formulas-lite, and clipboard paste—without building a full Excel clone.
Bind a 2D cell model to the grid. Keep parsing and file I/O out of code-behind event handlers as the sheet grows.
After you run the snapshot, you should recognize the behavior described in the goal—before you move on. If the window (or server) never appears, stop and fix the run steps.
Code shape
Snapshots stay small on purpose. Look for this kind of core call as you read the folder:
File.WriteAllLines(path, rows.Select(r => string.Join(",", r)));How to run it
Clone the teaching repo, open 11-Sheets, install what the README asks for, then run dotnet run.
git clone https://github.com/michaeldunga1/fcc-wpf-spreadsheet.git
cd fcc-wpf-spreadsheet/11-Sheets
dotnet restore
dotnet build
dotnet runCommon mistakes
- Ignoring platform-specific install notes in the snapshot README
- Hiding a feature in the UI without enforcing it in code
- Leaving trash/spam actions irreversible
- Forgetting a status message after a bulk action