ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Geometry Namespace / IGeometryEngine Interface / ImportFromJson Method
A combination of JsonImportFlags which determines how the geometry is imported.
The input JSON string. If the spatial reference information is in the string, then the output geometry will have the spatial reference associated with it.
Example

In This Topic
    ImportFromJson Method (IGeometryEngine)
    In This Topic
    Creates a geometry from the input JSON string.
    Syntax
    Function ImportFromJson( _
       ByVal importFlags As JsonImportFlags, _
       ByVal jsonString As String _
    ) As Geometry

    Parameters

    importFlags
    A combination of JsonImportFlags which determines how the geometry is imported.
    jsonString
    The input JSON string. If the spatial reference information is in the string, then the output geometry will have the spatial reference associated with it.

    Return Value

    A Geometry that corresponds to the jsonString.
    Exceptions
    ExceptionDescription
    jsonString is null or empty.
    Example
    Import and Export Geometries to JSON
    // MapPoint
    string inputString = 
      "{\"x\":1,\"y\":2,\"spatialReference\":{\"wkid\":4326,\"latestWkid\":4326}}";
    Geometry geometry = GeometryEngine.Instance.ImportFromJson(
      JsonImportFlags.JsonImportDefaults, inputString);
    
    MapPoint importPoint = geometry as MapPoint;
    // importPoint = 1, 2
    // importPoint.SpatialReference.WKid = 4326
    
    // use the MapPointBuilderEx convenience method
    MapPoint importPoint2 = MapPointBuilderEx.FromJson(inputString);
    // importPoint2 = 1, 2
    // impointPoint2.SpatialReference.Wkid = 4326
    
    string outputString = GeometryEngine.Instance.ExportToJson(
      JsonExportFlags.JsonExportDefaults, importPoint);
    // outputString =
    //   "{\"x\":1,\"y\":2,\"spatialReference\":{\"wkid\":4326,\"latestWkid\":4326}}"
    
    string outputString2 = importPoint.ToJson();
    
    inputString = 
      "{\"spatialReference\":{\"wkid\":4326},\"z\":3,\"m\":4,\"x\":1,\"y\":2}";
    importPoint = GeometryEngine.Instance.ImportFromJson(
      JsonImportFlags.JsonImportDefaults, inputString) as MapPoint;
    // importPoint.HasM = true
    // importPoint.HasZ = true
    // importPoint.X = 1
    // importPoint.Y = 2
    // importPoint.M = 4
    // importPoint.Z = 3
    
    importPoint2 = MapPointBuilderEx.FromJson(inputString);
    
    // export to json - skip spatial reference
    outputString = GeometryEngine.Instance.ExportToJson(
                  JsonExportFlags.JsonExportSkipCRS, importPoint);
    // outputString = "{\"x\":1,\"y\":2,\"z\":3,\"m\":4}"
    
    // export from mappoint, skipping the sr - same as GeometryEngine.Instance.ExportToJson w JsonExportFlags.JsonExportSkipCRS
    outputString2 = importPoint.ToJson(true);
    
    //
    // Multipoint
    //
    List<Coordinate2D> coords = new List<Coordinate2D>()
    {
      new Coordinate2D(100, 200),
      new Coordinate2D(201, 300),
      new Coordinate2D(301, 400),
      new Coordinate2D(401, 500)
    };
    
    Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(
      coords, SpatialReferences.WebMercator);
    
    inputString = 
      "{\"points\":[[100,200],[201,300],[301,400],[401,500]],\"spatialReference\":{\"wkid\":3857}}";
    Multipoint importMultipoint = 
      GeometryEngine.Instance.ImportFromJson(
             JsonImportFlags.JsonImportDefaults, inputString) as Multipoint;
    // importMultipoint.IsEqual(multipoint) = true
    
    ReadOnlyPointCollection points = importMultipoint.Points;
    // points.Count = 4
    // points[0] = 100, 200
    // points[1] = 201, 300
    // points[2] = 301, 400
    // points[3] = 401, 500
    
    // use the MultipointbuilderEx convenience method
    Multipoint importMultipoint2 = MultipointBuilderEx.FromJson(inputString);
    // importMultipoint2.IsEqual(multipoint) = true
    
    // export to json
    outputString = GeometryEngine.Instance.ExportToJson(
                    JsonExportFlags.JsonExportDefaults, multipoint);
    // outputString = inputString
    
    // or use the multipoint itself
    outputString2 = multipoint.ToJson();
    
    //
    // Polyline
    //
    Polyline polyline = PolylineBuilderEx.CreatePolyline(
                             coords, SpatialReferences.WebMercator);
    
    // export without the spatial reference
    outputString = GeometryEngine.Instance.ExportToJson(
                            JsonExportFlags.JsonExportSkipCRS, polyline);
    // import
    geometry = GeometryEngine.Instance.ImportFromJson(
                 JsonImportFlags.JsonImportDefaults, outputString);
    Polyline importPolyline = geometry as Polyline;
    // importPolyline.SpatialReference = null
    
    
    points = importPolyline.Points;
    // points.Count = 4
    // points[0] = 100, 200
    // points[1] = 201, 300
    // points[2] = 301, 400
    // points[3] = 401, 500
    
    // use the polylineBuilderEx convenience method 
    Polyline importPolyline2 = PolylineBuilderEx.FromJson(outputString);
    // importPolyline2 = importPolyline
    
    outputString2 = importPolyline2.ToJson();
    // outputString2 = outputString
    
    //
    // Polygon
    //
    Polygon polygon = PolygonBuilderEx.CreatePolygon(
                                  coords, SpatialReferences.WebMercator);
    
    // export without the spatial reference
    outputString = GeometryEngine.Instance.ExportToJson(
                              JsonExportFlags.JsonExportSkipCRS, polygon);
    // import
    geometry = GeometryEngine.Instance.ImportFromJson(
                         JsonImportFlags.JsonImportDefaults, outputString);
    
    Polygon importPolygon = geometry as Polygon;
    // importPolygon.SpatialReference = null
    points = importPolygon.Points;
    // points.Count = 5
    
    // polygonBuilderEx convenience method
    Polygon importPolyon2 = PolygonBuilderEx.FromJson(outputString);
    // importPolygon2 = importPolygon
    
    // export from the polygon
    outputString2 = importPolyon2.ToJson(true);
    
    // Empty polygon
    polygon = PolygonBuilderEx.CreatePolygon(SpatialReferences.WebMercator);
    outputString = GeometryEngine.Instance.ExportToJson(
                                   JsonExportFlags.JsonExportDefaults, polygon);
    importPolygon = GeometryEngine.Instance.ImportFromJson(
                        JsonImportFlags.JsonImportDefaults, outputString) as Polygon;
    
    // importPolygon.IsEmpty = true
    // importPolygon.SpatialReference.Wkid = 3857
    
    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 8.1

    See Also