ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data Namespace / Join Class / GetOriginTable Method
Example Version

GetOriginTable Method
Gets the Table which corresponds to the origin table used to create the join. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public Table GetOriginTable()

Return Value

The Table which corresponds to the origin table of the join.
Exceptions
ExceptionDescription
A geodatabase-related exception has occurred.
Remarks
If the JoinDirection property of the JoinDescription argument used to instantiate this object via Join Constructor is JoinDirection.Forward, this is the left table of the relationship class. If the property is JoinDirection.Backward, this is the right table of the relationship class.
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