DbaseFileWriter DBF write Geometry issue with the Geometry type "Polygon" and "Multipolygon"

[SonaliDogra]

Trying to export "Polygon" and "MultiPolygon" Geometry points using shapeFileDataWriter.Write(), Getting the following error "Expected geometry that implements 'MultiLineString' or 'LineString', but was 'Polygon' (Parameter 'geometry')". Any suggestions for a workaround or possible solution?

[DGuidi]

please add some details about the code you wrote and the data you use

[SonaliDogra]

        foreach (DataRow row in dt.Rows)
        {
            var geomStr = row[wktColumn].ToString();
            if (string.IsNullOrEmpty(geomStr))
                continue;
            Geometry geometry = null;
            try
            {
                var geom = reader.Read<Geometry>(geomStr);
                geometry = spatialReturnType == SpatialReturnType.WorkProgramPointCloud
                    ? geom.ToPointCloud()
                    : geom;

                var coordinates = new Coordinate[geometry.Coordinates.Length];
            }
            catch (Exception e)
            {
                _logger.LogError("Shapefile read geometry error", e);
            }
            
            if (geometry == null)
                continue;

            var attributesTable = new AttributesTable();
            foreach (DataColumn column in dt.Columns)
            {
                if (column.ColumnName == wktColumn ||
                    string.IsNullOrEmpty(column.ColumnName)
                )
                    continue;
                var value = row[column] == DBNull.Value ? null : row[column];

                attributesTable.Add(mappings[column.ColumnName], value);
                if (!first)
                    continue;

                if (column.DataType == typeof(int))
                    mockAttributesTable.Add(mappings[column.ColumnName], 99);
                else if (column.DataType == typeof(decimal) || column.DataType == typeof(float) ||
                         column.DataType == typeof(double))
                    mockAttributesTable.Add(mappings[column.ColumnName], 99.99);
                else if (column.DataType == typeof(DateTime))
                    mockAttributesTable.Add(mappings[column.ColumnName], DateTime.Now);
                else if (column.DataType == typeof(bool))
                    mockAttributesTable.Add(mappings[column.ColumnName], true);
                else
                    mockAttributesTable.Add(mappings[column.ColumnName], "test");
            }
            first = false;
            features.Add(new Feature(geometry, attributesTable));
        }

        var outDbaseHeader = ShapefileDataWriter.GetHeader(new Feature(null, mockAttributesTable), features.Count);
        if (spatialReturnType == SpatialReturnType.WorkProgramPointCloud)
        {
            ShapefileWriter.WriteFeatures($"{varTempPath}.shp", features, outDbaseHeader.Fields,
                ShapeGeometryType.MultiPoint);
        }
        else
        {
            var outGeomFactory = new GeometryFactory();
            var writer = new ShapefileDataWriter(varTempPath, outGeomFactory) {Header = outDbaseHeader};
            writer.Write(features);
        }

Above is the piece of code that is giving error at the last line

writer.Write(features);

DataSet:- ShapeFilePolygonExport.xlsx

[FObermaier]

I assume that the first item in your collection of features has a (Multi)LineString geometry and thus specifies that the Shapefile can contain only lineal geometries.

[DGuidi]

the excel states cleary that you have LineString and Polygon geometries in your data, you can write in a shapefile only LineString OR Polygon geometries, not both at the same time. As far as I remember, the shapefile is created using the "kind" of the first geometry in the set, and the error is thrown if a "non conformant" geometry is then processed