Repository for Ideas & Research
Open Source GIS, Hydrologic Modeling, Optimization

How to create a new feature class using ArcObjects

IGxDialog gxDialog;
IWorkspace ws;
IFields fields;
IFieldsEdit fieldsEdit;
IField field;
IFieldEdit fieldEdit;
IGeometryDefEdit geomDefEdit;
IFeatureClass fc;

// create an ArcMap dialog for selecting a new location
gxDialog = new GxDialogClass();
gxDialog.ObjectFilter = new GxFilterPolygonFeatureClassesClass();

// return if cancelled
if (!gxDialog.DoModalSave(0)) return;

if (gxDialog.FinalLocation is IGxDatabase)
{
    // if the user selected a workspace
    ws = ((IGxDatabase)gxDialog.FinalLocation).Workspace;
}
else if (gxDialog.FinalLocation is IGxDataset)
{
    // if the user selected a dataset
    ws = ((IGxDataset)gxDialog.FinalLocation).Dataset.Workspace;
}
else if (gxDialog.FinalLocation is IGxFolder)
{
    // ((IGxFolder)gxDialog.FinalLocation).FileSystemWorkspaceNames returns no names; not sure why
    // create a shapefile workspace factory
    IWorkspaceFactory wsFact;
    IName wsName;

    wsFact = new ShapefileWorkspaceFactoryClass();
    wsName = (IName)wsFact.Create(System.IO.Path.GetDirectoryName(gxDialog.FinalLocation.FullName),
        System.IO.Path.GetFileName(gxDialog.FinalLocation.FullName), null, 0);
    ws = (IWorkspace)wsName.Open();
}
else
{
    // unsupported final location
    throw new ApplicationException(string.Format("Unsupported final location category: {0}",
        gxDialog.FinalLocation.Category));
}

// check if the user specified name already exists
if (((IWorkspace2)ws).NameExists[esriDatasetType.esriDTFeatureClass, gxDialog.Name])
{
    IEnumDataset enumDS;
    IDataset ds;

    if (MessageBox.Show(string.Format("{0}: Already exists. Do you want to overwrite it?", gxDialog.Name),
        "Warning", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.No) return;

    enumDS = ws.Datasets[esriDatasetType.esriDTFeatureClass];
    while ((ds = enumDS.Next()) != null)
    {
        if ((ds.Name + (gxDialog.FinalLocation is IGxFolder ? ".shp" : "")).ToUpper() == gxDialog.Name.ToUpper())
        {
            if (ds.CanDelete())
            {
                ds.Delete();
            }
            else
            {
                throw new ApplicationException(string.Format("{0}: Cannot delete", gxDialog.Name));
            }
        }
    }
}

// create required fields
fields = new FieldsClass();
fieldsEdit = (IFieldsEdit)fields;

// create an OID field
field = new FieldClass();
fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "ObjectID";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;
fieldEdit.Required_2 = true;
fieldEdit.IsNullable_2 = false;

// add the OID field
fieldsEdit.AddField(field);

// define geometry
geomDefEdit = (IGeometryDefEdit)new GeometryDefClass();
geomDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon;
geomDefEdit.HasM_2 = false;
geomDefEdit.HasZ_2 = false;
geomDefEdit.SpatialReference_2 = yourSpatialReference;

// create a geometry field
field = new FieldClass();
fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "Shape";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
fieldEdit.GeometryDef_2 = geomDef;
fieldEdit.Required_2 = true;
fieldEdit.IsNullable_2 = false;

// add the geometry field
fieldsEdit.AddField(field);

// create a new feature class
fc = ((IFeatureWorkspace)ws).CreateFeatureClass(gxDialog.Name, fields, null, null,
    esriFeatureType.esriFTSimple, "Shape", "");

Wed Sep 6 13:05:58 2017 EDT by Huidae Cho
Parsing time: 0.024 seconds
XHTML . CSS . Powered by Uniqki!