Work with network diagrams

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    public IDiagramDataset GetDiagramDataset()
    {
      IBaseNetwork unBaseNetwork = GetUtilityNetwork();

      if (unBaseNetwork != null)
        return unBaseNetwork.DiagramDataset as IDiagramDataset;

      return null;
    }

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    public IEnumDiagramTemplate GetDiagramTemplates(IDiagramDataset DiagramDataset)
    {
      if (DiagramDataset != null)
        return DiagramDataset.DiagramTemplates;

      return null;
    }

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    public IEnumNetworkDiagram GetDiagrams(IDiagramDataset DiagramDataset)
    {
      if (DiagramDataset != null)
        return DiagramDataset.NetworkDiagrams;

      return null;
    }

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    private byte[] GetDiagramNameWithDiagramMaxExtent(NameValueCollection boundVariables, JsonObject operationInput, string outputFormat, string requestProperties, out string responseProperties)
    {
      responseProperties = null;

      if (ndDataset == null)
        ndDataset = GetDiagramDataset();

      if (ndDataset == null)
        throw new RestErrorException("No Network Diagram Dataset found");

      IEnumNetworkDiagram Diagrams = ndDataset.NetworkDiagrams;

      double maxSurface = 0.0;
      string diagramName = "";

      Diagrams.Reset();
      INetworkDiagram diagram = Diagrams.Next();
      while (diagram != null)
      {
        INetworkDiagramInfo diagramInfo = diagram.DiagramInfo;

        IEnvelope envelope = diagramInfo.DiagramExtent;
        double surface = envelope.Height * envelope.Width;

        if (surface > maxSurface)
        {
          maxSurface = surface;
          diagramName = diagram.Name;
        }

        diagram = Diagrams.Next();
      }

      JsonObject result = new JsonObject();
      result.AddString("MaxExtent", diagramName);

      return Encoding.UTF8.GetBytes(result.ToJson());

    }

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    private byte[] GetDiagramNameWithGeographicalMaxExtent1(NameValueCollection boundVariables, JsonObject operationInput, string outputFormat, string requestProperties, out string responseProperties)
    {
      responseProperties = null;

      if (ndDataset == null)
        ndDataset = GetDiagramDataset();

      if (ndDataset == null)
        throw new RestErrorException("No Network Diagram Dataset found");

      IEnumNetworkDiagram Diagrams = ndDataset.NetworkDiagrams;

      double maxSurface = 0.0;
      string diagramName = "";

      Diagrams.Reset();
      INetworkDiagram diagram = Diagrams.Next();
      while (diagram != null)
      {
        INetworkDiagramInfo diagramInfo = diagram.DiagramInfo;

        IEnvelope envelope = diagramInfo.NetworkExtent;
        double surface = envelope.Height * envelope.Width;

        if (surface > maxSurface)
        {
          maxSurface = surface;
          diagramName = diagram.Name;
        }

        diagram = Diagrams.Next();
      }

      JsonObject result = new JsonObject();
      result.AddString("MaxExtent", diagramName);

      return Encoding.UTF8.GetBytes(result.ToJson());
    }