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Custom Action

A custom action is an action that contains a collection of parameters, defined by the user, that will be evaluated during report processing. It does not affect the currently viewed report in any way - its purpose is to be used in a report viewer's interactive action event handlers: InteractiveActionExecuting(), InteractiveActionEnter() and InteractiveActionLeave().

To define a CustomAction use the Edit Action Dialog or create it programmatically in the report class body.

Here is an example how to get the custom action's parameters in InteractiveActionExecuting() event of WinForms Report Viewer.

void reportViewer1_CustomInteractiveActionExecuting(object sender, Telerik.ReportViewer.Common.InteractiveActionCancelEventArgs args)
    var strB = new System.Text.StringBuilder();
    strB.AppendLine("ReportItem name: " + args.Action.ReportItemName);

    var customAction = args.Action as Telerik.Reporting.Processing.CustomAction;
    if (null != customAction)
    foreach (var p in customAction.Parameters)
        strB.AppendLine(string.Format("Parameter \"{0}\" value: {1}", p.Key, p.Value));

    strB.AppendLine(string.Format("Mouse cursor position: {0}; Item bounds: {1}", args.CursorPos, args.Bounds));


{{source=CodeSnippets\VB\API\Telerik\ReportViewer\WinForms\Form1.vb region=WinFormsCustomInteractiveActionExecutingEventSnippet}}

' Handles the InteractiveActionExecuting event
' Do not forget to add the WithEvents clause on ReportViewer1 instantiation if needed.
Private Sub reportViewer1_CustomInteractiveActionExecuting(sender As Object, args As Telerik.ReportViewer.Common.InteractiveActionCancelEventArgs) Handles ReportViewer1.InteractiveActionExecuting
    Dim strB = New System.Text.StringBuilder()
    strB.AppendLine("ReportItem name: " + args.Action.ReportItemName)

    Dim customAction = TryCast(args.Action, Telerik.Reporting.Processing.CustomAction)
    If customAction IsNot Nothing Then
    For Each p As KeyValuePair(Of String, Object) In customAction.Parameters
        strB.AppendLine(String.Format("Parameter ""{0}"" value: {1}", p.Key, p.Value))
    End If

    strB.AppendLine(String.Format("Mouse cursor position: {0}; Item bounds: {1}", args.CursorPos, args.Bounds))

End Sub

See Also

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