ArcGIS Pro 3.1 API Reference Guide
ArcGIS.Core.Data Namespace / RelationshipClass Class / CreateRelationship Method
The Row from the origin table.
The Row from the destination table.
Example

In This Topic
    CreateRelationship Method (RelationshipClass)
    In This Topic
    Creates a new relationship between the two specified rows. This method must be called on the MCT. Use QueuedTask.Run.
    Syntax
    public Relationship CreateRelationship( 
       Row originRow,
       Row destinationRow
    )
    Public Function CreateRelationship( _
       ByVal originRow As Row, _
       ByVal destinationRow As Row _
    ) As Relationship

    Parameters

    originRow
    The Row from the origin table.
    destinationRow
    The Row from the destination table.

    Return Value

    A Relationship representing the pair of related rows.
    Exceptions
    ExceptionDescription
    originRow or destinationRow is null.
    This relationship class does not support this operation. For example, it is a virtual relationship class.
    A geodatabase-related exception has occurred.
    Remarks
    For relationships of type RelationshipCardinality.OneToOne and RelationshipCardinality.OneToMany that do not have user-attributes defined, no intermediate table will be created to store relationships between the rows with corresponding origin foreign and destination foreign key values. Instead, the origin row's primary key value will be written into the destination row's origin foreign key field.
    Example
    Creating a Relationship
    public async Task CreatingARelationship()
    {
      await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
      {
        using (Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri("path\\to\\sde\\file"))))
        using (RelationshipClass relationshipClass = geodatabase.OpenDataset<RelationshipClass>("LocalGovernment.GDB.OverviewToProject"))
        using (FeatureClass projectsFeatureClass = geodatabase.OpenDataset<FeatureClass>("LocalGovernment.GDB.CIPProjects"))
        using (FeatureClass overviewFeatureClass = geodatabase.OpenDataset<FeatureClass>("LocalGovernment.GDB.CIPProjectsOverview"))
        {
          // This will be PROJNAME. This can be used to get the field index or used directly as the field name.
          string originKeyField = relationshipClass.GetDefinition().GetOriginKeyField();
    
          EditOperation editOperation = new EditOperation();
          editOperation.Callback(context =>
          {
            // The rows are being added to illustrate adding relationships. If one has existing rows, those can be used to add a relationship.
            using (RowBuffer projectsRowBuffer = projectsFeatureClass.CreateRowBuffer())
            using (RowBuffer overviewRowBuffer = overviewFeatureClass.CreateRowBuffer())
            {
              projectsRowBuffer["TOTCOST"] = 500000;
    
              overviewRowBuffer[originKeyField] = "LibraryConstruction";
              overviewRowBuffer["PROJECTMAN"] = "John Doe";
              overviewRowBuffer["FUNDSOUR"] = "Public";
    
              using (Row projectsRow = projectsFeatureClass.CreateRow(projectsRowBuffer))
              using (Row overviewRow = overviewFeatureClass.CreateRow(overviewRowBuffer))
              {
                Relationship relationship = relationshipClass.CreateRelationship(overviewRow, projectsRow);
    
                //To Indicate that the Map has to draw this feature/row and/or the attribute table has to be updated
                context.Invalidate(projectsRow);
                context.Invalidate(overviewRow);
                context.Invalidate(relationshipClass);
              }
            }
          }, projectsFeatureClass, overviewFeatureClass);
    
          bool editResult = editOperation.Execute();
        }
      });
    }
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.0 or higher.
    See Also