DynamicOrchestrator.cs

public class DynamicOrchestrator
{
 
    [FunctionName(nameof(DynamicOrchestrator))]
    public async Task<string> Run([OrchestrationTrigger] IDurableOrchestrationContext context,
        ExecutionContext executionContext)
    {
        var input = context.GetInput<OrchestratorInput>();
 
        string greeting = "";
        switch (input.Name.Length)
        {
           case <= 4 :
               greeting = await context.CallSubOrchestratorAsync<string>(nameof(ShortNameOrchestrator), input);
               break;
           default:
               greeting = await context.CallSubOrchestratorAsync<string>(nameof(LongNameOrchestrator), input);
               break;
        }
 
        return greeting;
    }
}