[UMN_MAPSERVER-USERS] MapScript C# QueryByPoint

[Christopher Condit]

I have a question about QueryByPoint in C# MapScript.  I’ve subclassed the layerObj and want to run QueryByPoint from this object.  getNumResults always returns 0, however.  I have a template defined for the layer – and results are returned from the mapserver CGI.   Is there some special way to run a query from inside a layerObj (or subclass)?   Thanks,   Chris   public class elevationLayer : layerObj {                 public elevationLayer(mapObj map) : base(map)       {             name = "Elevation";                                               type = MS_LAYER_TYPE.MS_LAYER_RASTER;             data = ""       }                   public string QueryLayer(double x, double y)       {             string ret = null;                              int res = queryByPoint(map, new pointObj(x, y, 0, 0), mapscript.MS_SINGLE, 0.25 );                                                 ret = "<b>Depth: </b>";             if (0 == getNumResults())                   ret += "Unknown";             else             {                       open();                   resultCacheMemberObj result = getResult(0);                                         if (null != result)                   {                         shapeObj shape = getFeature(result.shapeindex, result.tileindex);                                                                                           ret += int.Parse(shape.getValue(2)) * -1 + " m.<br />";                                                           }                   close();                                                                                           }                                                     return ret;       }   }