ConnectorFormat.ConnectStartPoint(Shape, Int32) Method
Attaches the connector's start point to the drawing object.
A Shape object that is a drawing object to connect to.
An integer that is the index number of a shapes' connection site to which the connector should be attached.
Check the drawing object's connection sites number using the ShapeGeometry.ConnectionSiteCount property. The connection sites' index number starts from 0 and grows as you move counterclockwise.
The code sample below shows how to insert a shape connector, provide it with arrows, change the outline color and attach it to shapes. Both ends are connected to the third connection site of each shape.
// Insert a shape connector. Shape shapeConnector = worksheet.Shapes.AddConnector(ConnectorType.Curved, 10, 10, 100, 100); // Adjust the connector's outline. shapeConnector.Outline.SetSolidFill(Color.Black); shapeConnector.Outline.Width = 2.5; // Convert the connector's ends into arrows. ConnectorFormat connectorFormat = shapeConnector.ConnectorFormat; connectorFormat.Arrows.StartArrowheadType = ArrowheadType.Stealth; connectorFormat.Arrows.StartArrowheadWidth = ArrowheadSize.Large; connectorFormat.Arrows.StartArrowheadLength = ArrowheadSize.Large; connectorFormat.Arrows.EndArrowheadType = ArrowheadType.Stealth; connectorFormat.Arrows.EndArrowheadWidth = ArrowheadSize.Large; connectorFormat.Arrows.EndArrowheadLength = ArrowheadSize.Large; // Bind the connector to two shapes. connectorFormat.ConnectStartPoint(shape1, 3); connectorFormat.ConnectEndPoint(shape2, 3);