public void CreateRoutesUsing2Fields(string sAccessWS, string sLineFC, string sOutRouteFC, string sWhereClause, string sRouteIDField, string sFromMeasureField, string sToMeasureField)
{
try
{
// VARIABLES
// sAccessWS - access workspace (i.e. "http://www.cnblogs.com/zuiyirenjian/admin/file://burt/data/dyndata/pitt.mdb")
// sLineFC - the input line feature class ("base_roads")
// sOutRouteFC - the output route feature class name ("routes")
// sWhereClause - query filter for line feature class if needed (i.e. "[RKey] <> 0")
// sRouteIDField - route ID field (i.e "Rkey")
// sFromMeasureField - the from-measure field (i.e. "BegMP")
// sToMeasureField - the to-measure field (i.e "EndMP")
//Get the line feature class
IWorkspaceFactory wsf = new AccessWorkspaceFactoryClass();
IWorkspace ws = wsf.OpenFromFile(sAccessWS, 0);
IFeatureWorkspace fws = (IFeatureWorkspace)ws;
IFeatureClass lineFC = fws.OpenFeatureClass(sLineFC);
// Create an output feature class name object. We'll write to a stand alone feature class in the
// the same workspace as the inputs
IDataset ds = (IDataset)ws;
IWorkspaceName outWSN = (IWorkspaceName)ds.FullName;
IFeatureClassName outFCN = new FeatureClassNameClass();
IDatasetName outDSN = (IDatasetName)outFCN;
outDSN.WorkspaceName = outWSN;
outDSN.Name = sOutRouteFC; //This name should not already exist
// Create a geometry definition for the new feature class. For the most part, we will copy the geometry
// definition from the input lines. We'll explicitly set the M Domain, however. You should always set an
// M Domain that is appropriate to your data. What is below is just a sample.
IFields flds = lineFC.Fields;
Int32 i = flds.FindField(lineFC.ShapeFieldName);
IField fld = flds.get_Field(i);
IClone GDefclone = (IClone)fld.GeometryDef;
IGeometryDef gDef = (IGeometryDef)GDefclone.Clone();
ISpatialReference2 srRef = (ISpatialReference2)gDef.SpatialReference;
srRef.SetMFalseOriginAndUnits(-1000, 10000);
// Create a selection set to limit the number of lines that will be used to create routes
IQueryFilter qFilt = new QueryFilterClass();
qFilt.WhereClause = sWhereClause;
ISelectionSet2 selSet = (ISelectionSet2)lineFC.Select(qFilt, esriSelectionType.esriSelectionTypeIDSet, esriSelectionOption.esriSelectionOptionNormal, ws);
// Create a new RouteMeasureCreator object. Note that below, we use the selection set and not the
// InputFeatureClass property
IRouteMeasureCreator routeCreator = new RouteMeasureCreatorClass();
routeCreator.InputFeatureSelection = selSet;
routeCreator.InputRouteIDFieldName = sRouteIDField;
IEnumBSTR errors = routeCreator.CreateUsing2Fields(sFromMeasureField, sToMeasureField, outFCN, gDef, "", null);
// The results of running CreatingUsing2Fields returns IEnumBSTR, which is a container
// for a list of error strings indicating why certain lines could not be used to create routes.
string sError = errors.Next();
do
{
System.Windows.Forms.MessageBox.Show(sError);
sError = errors.Next();
} while (sError.Length != 0);
}
catch(Exception e)
{
System.Windows.Forms.MessageBox.Show(e.Message);
}
