AspireChangeableEnvVar.cs

// Define our initial value
var value = "initial value";

resource
    // Important - need to use a lambda here to ensure the latest value is loaded when the app is restarted
    .WithEnvironment("Dynamic", () => value)
    // Add a custom command, when invoked, this
    // 1. uses the interaction service to prompt for a value
    // 2. Update the value used in the `WithEnvironment` lambda
    // 3. Restarts the resource to force it to pick up the new env var.
    .WithCommand("Change Value", "Change Value", async ctx =>
    {
        var interactionService = ctx.ServiceProvider.GetRequiredService<IInteractionService>();
        if (!interactionService.IsAvailable)
        {
            return CommandResults.Failure("Interaction service is not available.");
        }

        var input = new InteractionInput
        {
            Name = "Name",
            InputType = InputType.Text,
            Required = true,
            Placeholder = "my-app"
        };

        var result = await interactionService.PromptInputAsync("New value", "Enter a value", input, cancellationToken: ctx.CancellationToken);
        if (result.Canceled)
        {
            return CommandResults.Canceled();
        }

        value = result.Data.Value;

        var commandService = ctx.ServiceProvider.GetRequiredService<ResourceCommandService>();
        await commandService.ExecuteCommandAsync(resource.Resource.Name, "resource-restart", ctx.CancellationToken);

        return CommandResults.Success();
    });