WorkflowWindowsFormsModule.QueryAvailableActivities Event
Occurs prior to loading the rehosted workflow designer.
Namespace: DevExpress.ExpressApp.Workflow.Win
Assembly: DevExpress.ExpressApp.Workflow.Win.v24.1.dll
NuGet Package: DevExpress.ExpressApp.Workflow.Win
Declaration
Event Data
The QueryAvailableActivities event's data class is ActivitiesInformationEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
ActivitiesInformation | Specifies activities that will be available in the rehosted workflow designer’s toolbox. |
Remarks
Handle this event to customize the list of activities that will be available in the rehosted workflow designer’s toolbox. The following code snippet demonstrates how to remove a MyActivity activity from the toolbox.
using System;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Workflow;
using DevExpress.ExpressApp.Workflow.Win;
//...
public class MyWindowController : WindowController {
WorkflowWindowsFormsModule workflowModuleWin;
protected override void OnActivated() {
base.OnActivated();
workflowModuleWin = Application.Modules.FindModule<WorkflowWindowsFormsModule>();
if (workflowModuleWin != null)
workflowModuleWin.QueryAvailableActivities += OnQueryAvailableActivities;
}
void OnQueryAvailableActivities(object sender, ActivitiesInformationEventArgs e) {
ActivityInformation myActivity =
e.ActivitiesInformation.Find(i => i.DisplayName == "MyActivity");
e.ActivitiesInformation.Remove(myActivity);
}
protected override void OnDeactivated() {
if (workflowModuleWin != null) {
workflowModuleWin.QueryAvailableActivities -= OnQueryAvailableActivities;
workflowModuleWin = null;
}
base.OnDeactivated();
}
}
To see an example of handling this event to add new activities to the toolbox, refer to the Add Activities to the Workflow Designer Toolbox help topic.