{"id":43127,"date":"2020-03-20T15:38:00","date_gmt":"2020-03-20T15:38:00","guid":{"rendered":"http:\/\/sticky-highjinx.flywheelsites.com\/?p=43127"},"modified":"2024-12-17T10:03:13","modified_gmt":"2024-12-17T15:03:13","slug":"x-language-chain-of-command","status":"publish","type":"post","link":"https:\/\/envistacorp.com\/en-au\/2020\/03\/20\/x-language-chain-of-command\/","title":{"rendered":"D365 Development: X++ Language Chain of Command Examples"},"content":{"rendered":"Reading Time: <\/span> 3<\/span> minutes<\/span><\/span>\n

Using Chain of Command in X++<\/h2>\n\n\n\n

The Chain of Command pattern has been\u202favailable in\u202fMicrosoft Dynamics 365<\/a>\u202ffor a\u202ffew\u202fyear (since Platform Update 9), and we\u2019re still seeing miscommunications around the topic.\u202fIn this week\u2019s blog, we will answer:\u202fWhat is it? How do I use it? When would I use it? What does it replace?\u00a0<\/p>\n\n\n\n

What is the Chain of Command Pattern in X++?<\/h2>\n\n\n\n

In Microsoft Dynamics 365, Chain of Command (CoC) enables customization and extension of base Microsoft code. Microsoft’s base objects and code cannot be changed directly in D365, but CoC allows for the application’s capabilities to be extended.<\/p>\n\n\n\n

The easiest way to explain chain of command is that next() is similarly used as super(). Anything before the next() call can be considered a pre-event handler and anything after it is considered a post-event handler.    <\/p>\n\n\n\n

Please keep in mind that this is not creating a child class by the keyword extends. It is, however, allowing the developer to add business logic before or after existing method calls. It is called a chain because of the chain of events that occurs. Consider using chain of command on the update method for theSalesTable table. The chain would execute as follows: <\/p>\n\n\n\n

salesTable_Extension.update() before next() -> salesTable.update() -> salesTable_Extension.update() after next() <\/p>\n\n\n\t\t

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Make the most of Microsoft Dynamics 365\u2019s Advanced Warehousing module and gain insight into the hidden treasures to unlock value.<\/p>\n\t\t<\/div>\n\t\t\n\t\t