Reference Guide
GdPicture14.WPF Namespace / GdViewer Class / BeforeDocumentChange Event
Example





In This Topic
    BeforeDocumentChange Event (GdViewer)
    In This Topic
    This event is raised right before the new document is displayed (changed) after the successful loading in the GdViewer control using one of the DisplayFrom... methods.

    The event makes use of bubble routing strategy. Please check the corresponded GdViewer.BeforeDocumentChangeEventArgs for more details.

    Syntax
    'Declaration
     
    
    Public Event BeforeDocumentChange As GdViewer.BeforeDocumentChangeHandler
    public event GdViewer.BeforeDocumentChangeHandler BeforeDocumentChange
    public event BeforeDocumentChange: GdViewer.BeforeDocumentChangeHandler; 
    In JScript, you can handle the events defined by another class, but you cannot define your own.
    public: __event GdViewer.BeforeDocumentChangeHandler* BeforeDocumentChange
    public:
    event GdViewer.BeforeDocumentChangeHandler^ BeforeDocumentChange
    Event Data

    The event handler receives an argument of type GdViewer.BeforeDocumentChangeEventArgs containing data related to this event. The following GdViewer.BeforeDocumentChangeEventArgs properties provide information specific to this event.

    PropertyDescription
    (Inherited from System.Windows.RoutedEventArgs)
    (Inherited from System.Windows.RoutedEventArgs)
    (Inherited from System.Windows.RoutedEventArgs)
    (Inherited from System.Windows.RoutedEventArgs)
    Example
    How to utilize this event in your GdViewer control.
    'We assume that the GdViewer1 control has been properly integrated
    'and the BeforeDocumentChange event has been properly added.
                
    'Define the event.
    Sub GdViewer1_BeforeDocumentChange(ByVal sender As Object, ByVal e As GdPicture14.WPF.GdViewer.BeforeDocumentChangeEventArgs)
        'Do your stuff here.
    End Sub
    //We assume that the GdViewer1 control has been properly integrated
    //and the BeforeDocumentChange event has been properly added.
                
    //Define the event.
    void GdViewer1_BeforeDocumentChange(object sender, GdPicture14.WPF.GdViewer.BeforeDocumentChangeEventArgs e)
    {
        //Do your stuff here.
    }
    See Also