/// <summary>
/// Sets a join based on the specified relationship class and join type.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="foreignClass">The join.</param>
/// <param name="layerKeyField">Name of the layer field.</param>
/// <param name="foreignKeyField">Name of the join field.</param>
/// <param name="cardinality">The cardinality.</param>
/// <param name="joinType">Type of the join.</param>
/// <returns>
/// Returns a <see cref="IRelQueryTable" /> represents the table and feature join.
/// </returns>
public static IRelQueryTable Add(this IFeatureLayer source, IObjectClass foreignClass, string layerKeyField, string foreignKeyField, esriRelCardinality cardinality, esriJoinType joinType)
{
IRelQueryTable result;
IRelationshipClass relClass;
var table = ((IDisplayTable)source).DisplayTable as IRelQueryTable;
if (table != null)
{
result = source.Add(table, foreignClass, string.Format("{0}.{1}", ((IDataset)source.FeatureClass).Name, layerKeyField), foreignKeyField, cardinality, joinType);
relClass = result.RelationshipClass;
}
else
{
var layer = (IFeatureClass)((IDisplayTable)source).DisplayTable;
relClass = layer.Join(foreignClass, layerKeyField, foreignKeyField, cardinality, null);
var factory = new RelQueryTableFactoryClass();
result = factory.Open(relClass, true, null, null, "", true, joinType == esriJoinType.esriLeftInnerJoin);
}
IDisplayRelationshipClass display = (IDisplayRelationshipClass)source;
display.DisplayRelationshipClass(relClass, joinType);
return(result);
}