durable-7-fanoutfanin.cs

[FunctionName("ParallelWorkflow")]
public static async Task Parallel([OrchestrationTrigger] DurableOrchestrationContext context)
{
    var amsterdam = context.CallSubOrchestratorAsync("BookTrip", serverlessDaysAmsterdam);
    var hamburg   = context.CallSubOrchestratorAsync("BookTrip", serverlessDaysHamburg);

    var expenses = await Task.WhenAll(amsterdam, hamburg);

    await context.CallActivityAsync("ReportExpenses", expenses);
}