How to execute a method after usercontrol is fully visible

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I have a usercontrol containing a textbox which i load dynamically onto a form. At the form's start up i initiate the usercontrol and set it's visibility tag to 'false'. I want to trigger a method automatically when the usercontrol becomes visible, since this method writes some output to the textbox this method should only start executing after the usercontrol and all it's inherited controls become visible to the user. I thought the paintEventHandler should be the last event that gets triggered when a form and its inherited controls gets repainted after eg a control's visibility gets changed. So subscribing to the paintEventHandler should trigger my subscribed method after the form is fully repainted, but apparently is does not, my method executes while my textbox is still hidden, turning only visible after the method finished executing. Any thoughts on this?

private void processControl_SetActive(object sender, CancelEventArgs e)
        {

            this.BeginInvoke((MethodInvoker)delegate
           {
               this.Paint += new PaintEventHandler(processControl_Paint);
           });

        }

void processControl_Paint(object sender, PaintEventArgs e)
        {
            //Should only be called when everything is fully loaded and visible on the form.
            //Application.DoEvents()  ->probably bad idea??
            AddStuffToTextBox();
        }

You could try adding the text box initialization code to a handler for the Enter event of the user control, which fires when the control gains input focus and then in your code that activates the control make sure you call the Focus method on the control to set it active. You would probably want to keep a flag so this was done only on the first occurrence of the control gaining input focus.

UserControl.Load Event (System.Windows.Forms), Occurs before the control becomes visible for the first time. The following code example demonstrates the use of this member. If the UserControl is part of an MDI child form, the Load event will occur each time the child form is shown. ( One way that a handle is recreated is by calling the RecreateHandle method.)� The Load event occurs when the handle for the UserControl is created. In some circumstances, this can cause the Load event to occur more than one time. For example, the Load event occurs when the UserControl is loaded, and again if the handle is recreated. (One way that a handle is recreated is by calling the RecreateHandle method.)


Applied solution written by Guillemaune at the first reply! Thanks! Just keep in mind not to throw the function when the object goes not visible (it depends on the case)

private void Control_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e) {
    if (e.Property.ToString().Equals("IsVisible") && (bool)e.NewValue)
        doYourStuffHere();
}

Advanced WPF: Understanding Routed Events And Commands In , Scroll down in the displayed partial class to the Connect method where you will You specify that flag with a call like the following: C# Click events could be bubbling out from inside of a user control contained in your window. But attached events can be quite handy when you need to do event handling� You can execute your code asynchronously using Dispatcher class. Dispatcher.BeginInvoke (new Action (() => Trace.WriteLine ("DONE!", "Rendering")), DispatcherPriority.ContextIdle, null); This code should be added to your Window Loaded event handler. It is executed when all controls inside your window are rendered.


See VisibleChanged event.

Dynamic Loading of ASP.NET User Controls, A User Control is a kind of composite control that works much like an ASP. be useful if there was a way of dynamically loading specific User Controls at run time . For example, to load the SimpleControl User Control, the following C# code Visible = false; } protected void CreateUserControl() { // createAgain field is set to � At the form's start up i initiate the usercontrol and set it's visibility tag to 'false'. I want to trigger a method automatically when the usercontrol becomes visible, since this method writes some output to the textbox this method should only start executing after the usercontrol and all it's inherited controls become visible to the user.


You can subscribe to VisibleChanged event of your control or override OnVisibleChanged. To invoke your code only when user control is shown, post method invoke into control message queue. You can also try it with Paint event if VisibleChanged fails in your case, but I do not think so. BTW, why you add event via BeginInvoke?

void OnVisibleChanged(EventArgs e)
{
    //Should only be called when everything is fully loaded and visible on the form.
    //Application.DoEvents()  -> actually bad idea!!
    if (IsHandleCreated)
        BeginInvoke(new MethodInvoker(AddStuffToTextBox));
    base.OnVisibleChanged(e);
}

Creating & using a UserControl, User controls, in WPF represented by the UserControl class, is the concept of Download & run this example just add this functionality to your regular Window, but since it could be useful to do in several Here's the full code sample for our window: The Grid - Spanning � The GridSplitter � Using the Grid: A contact form � The Load event occurs after the control is created, but before the control becomes visible for the first time. Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events. The OnLoad method also allows derived classes to handle the event without attaching a delegate. This is the preferred


Since what you really want to do is fill the text box line by line, I'd suggest starting a timer when the VisibleChanged event is fired. In the timer's Tick event, you can add a line of text. If you need to wait longer before the first timer tick, then set the timer's delay longer and then reduce it the first time through the Tick event handler.

A Design Pattern for Building WPF Business Applications: Part 1, When building any kind of application, it's important to start with a good architecture Add three properties (Listing 1) to this class; one to control the visibility of the WPF has only one thread of execution, the UI hasn't completely rendered fully the UserControls folder, the fully qualified type of each control is the following:. Test the run-time behavior of a UserControl. In Visual Studio, create a Windows control library project, and name it TestContainerExample. In the Windows Forms Designer, drag a Label control from the Toolbox onto the control's design surface. Press F5 to build the project and run the UserControl Test Container.


Proposal: Add a way to track effective visibility of a control � Issue , There's currently no good way to know if a control is currently visible and should auto-start (the clock element must be manually re-started later). of immediately executed, then the info in VisibilityChangedEventArgs the event ActualVisibilityChanged is triggered via a full check or only a quick check. The Main method calls Run to start the application, which creates the form, listBox1, and button1. When the user clicks button1, the button1_Click method adds numbers one to three to the list box, and displays a MessageBox. If the user clicks No on the MessageBox, the button1_Click method adds another number to the list.


Custom Controls in Visual C# .NET, Embedding user controls in a Windows form is just like adding a simple button or text box that are already provided To create controls that provide entirely new functionality, or just combine This Property // will be visible in the containing application. The following sample shows how to implement a Login user control. The user control does its own painting and also handles all of the basic functionality associated with controls. To create a user control. Create a new Windows Control Library project in Visual Studio. A new project is created with a blank user control. Drag controls from the Windows Forms tab of the Toolbox onto your designer.


Rendering individual controls for AJAX Callbacks, It's quite handy to render HTML as part of AJAX callbacks and spit it back to the client. NET Web Form rendering to render individual controls or compound user The following generic code renders any non-Postback control or any to the client you can implement this content inside of a user control.