ArcGIS Developer Help

IGeometryDefEdit Interface

Provides access to members that modify the geometry definition.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Members

	Name	Description
	AvgNumPoints	The estimated average number of points per feature.
	AvgNumPoints	The estimated average number of points per feature.
	GeometryType	The geometry type.
	GeometryType	The enumerated geometry type.
	GridCount	The number of spatial index grids.
	GridCount	The number of spatial index grids.
	GridSize	The size of a spatial index grid.
	GridSize	The size of a spatial index grid.
	HasM	Indicates if the feature class will support M values.
	HasM	Indicates if the feature class has measure (M) values.
	HasZ	Indicates if the feature class will support Z values.
	HasZ	Indicates if the featureClass has Z values.
	SpatialReference	The spatial reference of the dataset.
	SpatialReference	The spatial reference for the dataset.

Inherited Interfaces

Interfaces	Description
IGeometryDef	Provides access to members that return information about the geometry definition.

Classes that implement IGeometryDefEdit

Classes	Description
GeometryDef	Esri Geometry Definition object.

Remarks

The IGeometryDefEdit interface is used when creating a GeometryDef object. You would normally use this interface when defining a new feature class. You cannot use IGeometryDefEdit to modify an existing GeometryDef which is attached to a feature class; the same restrictions apply when using the standard ArcGIS user interface. For example, you cannot change the spatial reference of an existing feature class.

The following are valid Geometry types for a new feature class (from esriGeometryType):

esriGeometryPoint

esriGeometryMultipoint

esriGeometryPolyline

esriGeometryPolygon

esriGeometryMultiPatch

The SpatialReference property should always be set when creating a new GeometryDef. If a GeometryDef without a spatial reference is used to create a stand-alone feature class, an error will occur.

If a feature class is created in a feature dataset, and the SpatialReference property does not match the spatial reference of the feature dataset, the property will be modified to match that of the feature dataset.

[C#]

The code below shows how to create a geometry field, assuming a spatial reference has already been created:

// Create the GeometryDef and set its spatial reference and geometry type.
IGeometryDef geometryDef = new GeometryDefClass();
IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
geometryDefEdit.SpatialReference_2 = spatialReference;
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;

// Set the grid count to 1 and the grid size to 0 to allow ArcGIS to
// determine a valid grid size.
geometryDefEdit.GridCount_2 = 1;
geometryDefEdit.set_GridSize(0, 0);

// Create a geometry field and assign the GeometryDef to it.
IField field = new FieldClass();
IFieldEdit fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "SHAPE";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
fieldEdit.GeometryDef_2 = geometryDef;

[Visual Basic .NET]

The code below shows how to create a geometry field, assuming a spatial reference has already been created:

' Create the GeometryDef and set its spatial reference and geometry type.
Dim geometryDef As IGeometryDef = New GeometryDefClass()
Dim geometryDefEdit As IGeometryDefEdit = CType(geometryDef, IGeometryDefEdit)
geometryDefEdit.SpatialReference_2 = spatialReference
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline

' Set the grid count to 1 and the grid size to 0 to allow ArcGIS to
' determine a valid grid size.
geometryDefEdit.GridCount_2 = 1
geometryDefEdit.GridSize_2(0) = 0

' Create a geometry field and assign the GeometryDef to it.
Dim field As IField = New FieldClass()
Dim fieldEdit As IFieldEdit = CType(field, IFieldEdit)
fieldEdit.Name_2 = "SHAPE"
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry
fieldEdit.GeometryDef_2 = geometryDef