ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data Namespace / Table Class / IsJoinedTable Method
Example Version

IsJoinedTable Method
Gets a value indicating whether this Table was obtained as a result of joining a Table or a FeatureClass with another Table or FeatureClass from the same or different Datastore. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public bool IsJoinedTable()

Return Value

true if this is a joined table; otherwise, false.
Example
Getting a Table Definition from a Layer
// GetDefinitionFromLayer - This code works even if the layer has a join to another table
private TableDefinition GetDefinitionFromLayer(FeatureLayer featureLayer)
{
    // Get feature class from the layer
    FeatureClass featureClass = featureLayer.GetFeatureClass();

    // Determine if feature class is a join
    if (featureClass.IsJoinedTable())
    {
        // Get join from feature class
        Join join = featureClass.GetJoin();

        // Get origin table from join
        Table originTable = join.GetOriginTable();

        // Return feature class definition from the join's origin table
        return originTable.GetDefinition();
    }
    else
    {
        return featureClass.GetDefinition();
    }
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also