Why should you care?

ShopNest admin actions (export, refund) need queueing, auditing, and undo-friendly operations.

See it live — copy this example

Paste into a C# console or class library project and run dotnet run.

public interface ICommand { void Execute(); }
public sealed class ExportOrdersCommand : ICommand
{
    private readonly string _day;
    public ExportOrdersCommand(string day) => _day = day;
    public void Execute() => Console.WriteLine($"export orders {_day}");
}
public sealed class CommandBus
{
    public void Run(ICommand cmd) => cmd.Execute();
}

new CommandBus().Run(new ExportOrdersCommand("2026-07-19"));

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

What happened?

• ExportOrdersCommand carries parameters and work.
• The bus (invoker) only calls Execute.
• MediatR IRequest is a modern command-bus cousin.

Practice next

1. Execute the export command.
2. Add RefundCommand.
3. Store commands in a list for a mini undo stack.
4. Add Undo() that prints revert.
5. Serialize command name to a queue message.

Remember

Request as object. Invoker ↔ receiver decoupled. Enables queue/audit/undo.

ShopNest admin command bus

UI posts ExportOrdersCommand to a worker.

Outcome: Same command runs from UI or scheduler.