线性参考

public AddLineEvent
{
  try
  {
    // Get the event table.  It is called 'pavement'.
    IMxDocument pMxDoc;
    ITableCollection pTblColl;
    ITable pEventTable = null;            
    IMap pMap;
    IDataset pDS;

    pMxDoc = (IMxDocument) m_app.Document;
    pMap = (IMap) pMxDoc.FocusMap;
    pTblColl = (ITableCollection) pMap;
    for (int i = 0; i < pTblColl.TableCount; i++)
    {
      pDS = (IDataset) pTblColl.get_Table(i);
      if (pDS.BrowseName.ToLower() == "pavement")
      {
        pEventTable = (ITable) pDS;
        break;
      }
    }
    if (pEventTable == null)
    {
      MessageBox.Show("Could not find the event table", "AddLineEventLayer", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
      return;
    }

    // Get the route feature class.  It is called 'roads_route_hwy'
    ILayer pLayer;
    IFeatureLayer pFLayer;
    IFeatureClass pRouteFc = null;
    for (int i = 0; i < pMap.LayerCount; i++)
    {
      pLayer = pMap.get_Layer(i);
      if (pLayer.Name.ToLower() == "roads_route_hwy")
      {
        pFLayer = pLayer as IFeatureLayer;
        if (pFLayer != null)
        {
          pRouteFc = (IFeatureClass) pFLayer.FeatureClass;
        }
      }
    }
    if (pRouteFc == null)
    {
      MessageBox.Show("Could not find the route feature class", "AddLineEventLayer", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
      return;
    }

    // Create the route event source...

    //The route locator
    IName pName;
    IRouteLocatorName pRMLName = new RouteMeasureLocatorNameClass();

    pDS = (IDataset) pRouteFc;
    pName = (IName) pDS.FullName;
    pRMLName.RouteFeatureClassName = pName;
    pRMLName.RouteIDFieldName = "rkey";
    pRMLName.RouteIDIsUnique = true;
    pRMLName.RouteMeasureUnit = 0;   // esriUnknownUnit type
    pRMLName.RouteWhereClause = "";

    // Create the route event properties
    //   We will be using IRouteEventProperties2 to take advantage of adding an error field
    IRouteEventProperties2 pRtProp = new RouteMeasureLinePropertiesClass();
    IRouteMeasureLineProperties pRMLnProp;

    pRtProp.EventMeasureUnit = 0;   // esriUnknownUnit type
    pRtProp.EventRouteIDFieldName = "rkey";
    pRtProp.LateralOffsetFieldName = "offset";
    pRtProp.AddErrorField = true;  // add field for locating errors
    pRtProp.ErrorFieldName = "LOC_ERRORS";   // specify name for the locating errors field

    pRMLnProp = (IRouteMeasureLineProperties) pRtProp;
    pRMLnProp.FromMeasureFieldName = "fmp";
    pRMLnProp.ToMeasureFieldName = "tmp";

    pDS = (IDataset) pEventTable;
    pName = (IName) pDS.FullName;

    IRouteEventSourceName pRESN = new RouteEventSourceNameClass();
    pRESN.EventTableName = pName;
    pRESN.EventProperties = (IRouteEventProperties) pRMLnProp;
    pRESN.RouteLocatorName = pRMLName;

    // By opening a route event source name object, you have a 'dynamic' feature class ...
    IFeatureClass pEventFC;
    pName = (IName) pRESN;
    pEventFC = (IFeatureClass) pName.Open();

    // Create the layer and add it to the current map
    IActiveView pActive;
    pFLayer = new FeatureLayerClass();
    pFLayer.FeatureClass = pEventFC;
    pFLayer.Name = pDS.BrowseName + "_Events";   // "Pavement_Events"

    pMap.AddLayer(pFLayer);

    pActive = (IActiveView) pMxDoc.ActiveView;
    pActive.Refresh();
  }
  catch (COMException COMEx)
  {
    MessageBox.Show(COMEx.Message,"COM Error: " + COMEx.ErrorCode.ToString(),MessageBoxButtons.OK,MessageBoxIcon.Warning);
  }
  catch (System.Exception SysEx)
  {
    MessageBox.Show(SysEx.Message,".NET Error: ",MessageBoxButtons.OK,MessageBoxIcon.Warning);
  }
}