IsExteriorRing(Int32) Method

In This Topic

Determines if the specified part of this polygon is an exterior ring.

Syntax

Visual Basic (Declaration)
C#

Public Function IsExteriorRing( _
   ByVal index As Integer _
) As Boolean

public bool IsExteriorRing( 
   int index
)

Parameters

index: The part index.

Return Value

A boolean indicating if the part is an exterior ring.

Exceptions

Exception	Description
System.ArgumentOutOfRangeException	The index is negative or is greater than or equal to the number of parts in this polygon.

Remarks

An exterior ring is a part that is oriented clockwise.

Example

Get the exterior rings of a polygon - polygon.GetExteriorRing

{
  static void GetExteriorRings(Polygon inputPolygon)
  {
    if (inputPolygon == null || inputPolygon.IsEmpty)
      return;

    // polygon part count
    int partCount = inputPolygon.PartCount;
    // polygon exterior ring count
    int numExtRings = inputPolygon.ExteriorRingCount;
    // get set of exterior rings for the polygon
    IList<Polygon> extRings = inputPolygon.GetExteriorRings();

    // test each part for "exterior ring"
    for (int idx = 0; idx < partCount; idx++)
    {
      bool isExteriorRing = inputPolygon.IsExteriorRing(idx);
      var ring = inputPolygon.GetExteriorRing(idx);
    }
  }
}

Requirements

Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)

ArcGIS Pro version: 3.0 or higher.

Reference

Polygon Class
Polygon Members

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