public Add( 
   NetworkAttribute networkAttribute
)

{
  // This routine creates an Add function to sum the Load network attribute during a trace
  static void ApplyFunction(UtilityNetworkDefinition utilityNetworkDefinition, TraceConfiguration traceConfiguration)
  {
    // Get a NetworkAttribute object for the Load network attribute from the UtilityNetworkDefinition
    using NetworkAttribute loadNetworkAttribute = utilityNetworkDefinition.GetNetworkAttribute("Load");
    // Create a function to sum the Load
    Add sumLoadFunction = new Add(loadNetworkAttribute);

    // Add this function to our trace configuration
    traceConfiguration.Functions = new List<Function>() { sumLoadFunction };
  }
}

{
  // This routine creates a FunctionBarrier that stops traversal when the total shape length exceeds 1000 feet
  static void CreateFunctionBarrier(UtilityNetworkDefinition utilityNetworkDefinition, TraceConfiguration traceConfiguration)
  {
    // Create a NetworkAttribute object for the Shape length network attribute from the UtilityNetworkDefinition
    using NetworkAttribute shapeLengthNetworkAttribute = utilityNetworkDefinition.GetNetworkAttribute("Shape length");
    // Create a function that adds up shape length
    Add lengthFunction = new Add(shapeLengthNetworkAttribute);

    // Create a function barrier that stops traversal after 1000 feet
    FunctionBarrier distanceBarrier = new FunctionBarrier(lengthFunction, Operator.GreaterThan, 1000.0);

    // Set this function barrier
    traceConfiguration.Traversability.FunctionBarriers = new List<FunctionBarrier>() { distanceBarrier };
  }
}