Custom workflow -get current user detail

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 public void Execute(IServiceProvider serviceProvider)
       {
           // Obtain the execution context from the service provider.
           // Obtain the execution context from the service provider.
           //Extract the tracing service for use in debugging sandboxed plug-ins.

           IPluginExecutionContext context =
               (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

           var CurrentUserId =  context.InitiatingUserId;

        }