ArcGIS Pro 2.7 API Reference Guide
RelationshipCardinality Enumeration

ArcGIS.Core.Data Namespace : RelationshipCardinality Enumeration
Specifies the number of rows in the origin table that can be related to a number of rows in the destination table.
Syntax
public enum RelationshipCardinality : System.Enum, System.IComparable, System.IConvertible, System.IFormattable  
Public Enum RelationshipCardinality 
   Inherits System.Enum
   Implements System.IComparable, System.IConvertible, System.IFormattable 
Members
MemberDescription
ManyToMany One origin row can relate to multiple destination rows and conversely, one destination row can relate to multiple origin rows.
OneToMany One origin row can relate to multiple destination rows. In a OneToMany relationship, the origin table is always the one side and the many side must be the destination.
OneToOne One origin row can relate to only one destination row.
Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         ArcGIS.Core.Data.RelationshipCardinality

Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

ArcGIS.Core.Data Namespace