Custom workflow activities (workflow assemblies)
Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online
Microsoft Dynamics 365 (online & on-premises) supports the registration and execution of custom workflow activities in addition to the out-of-box activities provided by Windows Workflow Foundation. Windows Workflow Foundation includes an activity library that provides activities for control flow, sending and receiving messages, doing work in parallel, and more. However, to build applications that satisfy your business needs, you may need activities that perform tasks specific to that application. To make this possible, Windows Workflow Foundation supports the creation of custom workflow activities.
You can write custom workflow activities in Microsoft Visual C# or Microsoft Visual Basic .NET code by creating an assembly that contains one or more classes derived from the Windows Workflow FoundationCodeActivity class. This assembly is annotated with .NET attributes to provide the metadata that Microsoft Dynamics 365 uses at runtime to link your code to the workflow engine.
After you have created an assembly that contains one or more custom workflow activities, you register this assembly with Microsoft Dynamics 365. This process is similar to registering a plug-in. The custom workflow activity can then be incorporated into a workflow or dialog in the Process form in Microsoft Dynamics 365.
Microsoft Dynamics 365 (online) only supports sandbox (partial trust) execution of custom workflow activities. On-premises Microsoft Dynamics 365 supports execution of custom workflow activities in partial or full trust.
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