A Blazor Server app for sharing C# REPL environments across the web.
By default, the app uses SQL Server LocalDB (which comes bundled with Visual Studio) for data storage -
it can be replaced with any other SQL Server instance by changing the connection string in Program.cs.
Before running the app it is necessary to apply the database migrations - use the UpdateDatabase commmand
in Visual Studio's Package Manager Console window or perform the equivalent dotnet ef database update
in the CLI (which requires the dotnet-ef tool to be installed).
Launch the app through Visual Studio or via dotnet run and open the link presented by the server process.
Use the Launch button to open a new REPL session. Each session is identified by a GUID in the last segment of the URL, which allows multiple users to join and use the same execution environment with full cross-synchronization, just share the address. The input & output of a session is persisted in the database, which prevents the users from loosing their data should they accidentally leave the app; unfortunately, the execution state is not automatically restored, so the user may need to copy-paste their code.
The app offers an interactive C# environment with some of the most popular namespaces available to the user:
- System,
- System.Math,
- System.Collections.Generic,
- System.Linq,
- System.Text,
- System.Text.Json,
as well as a predefined print() function. The arrow up key can be used to put the last inputted line into
the input field, allowing for quick corrections. A session archive can be downloaded with the Download log button.
There is no mechanism in place to moderate access to the sesssions - anyone can join if they have the session GUID.