Hi Ukris,
Thanks for using Syncfusion products,
LineConnector’s Label property can be used to associate text with a connector, aligning and font can be customized using LabelHorizontalAlignment and LabelFontFamily properties respectively. LabelTemplate property of a line connector can be used to host any UI element by applying DataTemplate, so that gif image or a TextBlock that contains special character can be hosted.
For more details please refer online documentation:
Line Connector Label
Link:
http://help.syncfusion.com/ug_83/User%20Interface/WPF/Diagram/index.htm Please navigate to Concepts and Features >> Line Connector >> Line Connector Label >> Label Template
Customize the Label of Nodes and Line Connectors
Link:
http://help.syncfusion.com/ug_83/User%20Interface/WPF/Diagram/index.htm Please navigate to Concepts and Features >> General >> customize the label of nodes and line connectors
Please let us know if you have further queries.
Regards,
Jegan